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115 results on '"van Weelderen, R."'

1. Interim report for the International Muon Collider Collaboration (IMCC)

Author

Accettura, C., Adrian, S., Agarwal, R., Ahdida, C., Aimé, C., Aksoy, A., Alberghi, G. L., Alden, S., Amapane, N., Amorim, D., Andreetto, P., Anulli, F., Appleby, R., Apresyan, A., Asadi, P., Mahmoud, M. Attia, Auchmann, B., Back, J., Badea, A., Bae, K. J., Bahng, E. J., Balconi, L., Balli, F., Bandiera, L., Barbagallo, C., Barlow, R., Bartoli, C., Bartosik, N., Barzi, E., Batsch, F., Bauce, M., Begel, M., Berg, J. S., Bersani, A., Bertarelli, A., Bertinelli, F., Bertolin, A., Bhat, P., Bianchi, C., Bianco, M., Bishop, W., Black, K., Boattini, F., Bogacz, A., Bonesini, M., Bordini, B., de Sousa, P. Borges, Bottaro, S., Bottura, L., Boyd, S., Breschi, M., Broggi, F., Brunoldi, M., Buffat, X., Buonincontri, L., Burrows, P. N., Burt, G. C., Buttazzo, D., Caiffi, B., Calatroni, S., Calviani, M., Calzaferri, S., Calzolari, D., Cantone, C., Capdevilla, R., Carli, C., Carrelli, C., Casaburo, F., Casarsa, M., Castelli, L., Catanesi, M. G., Cavallucci, L., Cavoto, G., Celiberto, F. G., Celona, L., Cemmi, A., Ceravolo, S., Cerri, A., Cerutti, F., Cesarini, G., Cesarotti, C., Chancé, A., Charitonidis, N., Chiesa, M., Chiggiato, P., Ciccarella, V. L., Puviani, P. Cioli, Colaleo, A., Colao, F., Collamati, F., Costa, M., Craig, N., Curtin, D., D'Angelo, L., Da Molin, G., Damerau, H., Dasu, S., de Blas, J., De Curtis, S., De Gersem, H., Del Moro, T., Delahaye, J. -P., Denisov, D., Denizli, H., Dermisek, R., Valdor, P. Desiré, Desponds, C., Di Luzio, L., Di Meco, E., Di Petrillo, K. F., Di Sarcina, I., Diociaiuti, E., Dorigo, T., Dreimanis, K., Pree, T. du, Edgecock, T., Fabbri, S., Fabbrichesi, M., Farinon, S., Ferrand, G., Somoza, J. A. Ferreira, Fieg, M., Filthaut, F., Fox, P., Franceschini, R., Ximenes, R. Franqueira, Gallinaro, M., Garcia-Sciveres, M., Garcia-Tabares, L., Gargiulo, R., Garion, C., Garzelli, M. V., Gast, M., Gerber, C. E., Giambastiani, L., Gianelle, A., Gianfelice-Wendt, E., Gibson, S., Gilardoni, S., Giove, D. A., Giovinco, V., Giraldin, C., Glioti, A., Gorzawski, A., Greco, M., Grojean, C., Grudiev, A., Gschwendtner, E., Gueli, E., Guilhaudin, N., Han, C., Han, T., Hauptman, J. M., Herndon, M., Hillier, A. D., Hillman, M., Holmes, T. R., Homiller, S., Jana, S., Jindariani, S., Johannesson, S., Johnson, B., Jones, O. R., Jurj, P. -B., Kahn, Y., Kamath, R., Kario, A., Karpov, I., Kelliher, D., Kilian, W., Kitano, R., Kling, F., Kolehmainen, A., Kong, K. C., Kosse, J., Krintiras, G., Krizka, K., Kumar, N., Kvikne, E., Kyle, R., Laface, E., Lane, K., Latina, A., Lechner, A., Lee, J., Lee, L., Lee, S. W., Lefevre, T., Leonardi, E., Lerner, G., Li, P., Li, Q., Li, T., Li, W., Voti, R. Li, Lindroos, M., Lipton, R., Liu, D., Liu, M., Liu, Z., Lombardi, A., Lomte, S., Long, K., Longo, L., Lorenzo, J., Losito, R., Low, I., Lu, X., Lucchesi, D., Luo, T., Lupato, A., Métral, E., Mękała, K., Ma, Y., Mańczak, J. M., Machida, S., Madlener, T., Magaletti, L., Maggi, M., Durand, H. Mainaud, Maltoni, F., Mandurrino, M., Marchand, C., Mariani, F., Marin, S., Mariotto, S., Martin-Haugh, S., Masullo, M. R., Mauro, G. S., Mazzolari, A., Mele, B., Meloni, F., Meng, X., Mentink, M., Miceli, R., Milas, N., Mohammadi, A., Moll, D., Montella, A., Morandin, M., Morrone, M., Mulder, T., Musenich, R., Nardecchia, M., Nardi, F., Neuffer, D., Newbold, D., Novelli, D., Olvegård, M., Onel, Y., Orestano, D., Osborne, J., Otten, S., Torres, Y. M. Oviedo, Paesani, D., Griso, S. Pagan, Pagani, D., Pal, K., Palmer, M., Pampaloni, A., Panci, P., Pani, P., Papaphilippou, Y., Paparella, R., Paradisi, P., Passeri, A., Pastrone, N., Pellecchia, A., Piccinini, F., Piekarz, H., Pieloni, T., Plouin, J., Portone, A., Potamianos, K., Potdevin, J., Prestemon, S., Puig, T., Qiang, J., Quettier, L., Rabemananjara, T. R., Radicioni, E., Radogna, R., Rago, I. C., Ratkus, A., Resseguie, E., Reuter, J., Ribani, P. L., Riccardi, C., Ricciardi, S., Robens, T., Robert, Y., Roger, C., Rojo, J., Romagnoni, M., Ronald, K., Rosser, B., Rossi, C., Rossi, L., Rozanov, L., Ruhdorfer, M., Ruiz, R., Queiroz, F. S., Saini, S., Sala, F., Salierno, C., Salmi, T., Salvini, P., Salvioni, E., Sammut, N., Santini, C., Saputi, A., Sarra, I., Scarantino, G., Schneider-Muntau, H., Schulte, D., Scifo, J., Sen, T., Senatore, C., Senol, A., Sertore, D., Sestini, L., Rêgo, R. C. Silva, Simone, F. M., Skoufaris, K., Sorbello, G., Sorbi, M., Sorti, S., Soubirou, L., Spataro, D., Stamerra, A., Stapnes, S., Stark, G., Statera, M., Stechauner, B. M., Su, S., Su, W., Sun, X., Sytov, A., Tang, J., Taylor, R., Kate, H. Ten, Testoni, P., Thiele, L. S., Garcia, R. Tomas, Mugglestone, M. Topp, Torims, T., Torre, R., Tortora, L. T., Trifinopoulos, S., Udongwo, S. -A., Vai, I., Valente, R. U., van Rienen, U., van Weelderen, R., Vanwelde, M., Velev, G., Venditti, R., Vendrasco, A., Verna, A., Verweij, A., Verwilligen, P., Villamzar, Y., Vittorio, L., Vitulo, P., Vojskovic, I., Wang, D., Wang, L. -T., Wang, X., Wendt, M., Widorski, M., Wozniak, M., Wu, Y., Wulzer, A., Xie, K., Yang, Y., Yap, Y. C., Yonehara, K., Yoo, H. D., You, Z., Zanetti, M., Zaza, A., Zhang, L., Zhu, R., Zlobin, A., Zuliani, D., and Zurita, J. F.

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

The International Muon Collider Collaboration (IMCC) [1] was established in 2020 following the recommendations of the European Strategy for Particle Physics (ESPP) and the implementation of the European Strategy for Particle Physics-Accelerator R&D Roadmap by the Laboratory Directors Group [2], hereinafter referred to as the the European LDG roadmap. The Muon Collider Study (MuC) covers the accelerator complex, detectors and physics for a future muon collider. In 2023, European Commission support was obtained for a design study of a muon collider (MuCol) [3]. This project started on 1st March 2023, with work-packages aligned with the overall muon collider studies. In preparation of and during the 2021-22 U.S. Snowmass process, the muon collider project parameters, technical studies and physics performance studies were performed and presented in great detail. Recently, the P5 panel [4] in the U.S. recommended a muon collider R&D, proposed to join the IMCC and envisages that the U.S. should prepare to host a muon collider, calling this their "muon shot". In the past, the U.S. Muon Accelerator Programme (MAP) [5] has been instrumental in studies of concepts and technologies for a muon collider., Comment: This document summarises the International Muon Collider Collaboration (IMCC) progress and status of the Muon Collider R&D programme

Published
2024

2. Challenges and Lessons Learned from fabrication, testing and analysis of eight MQXFA Low Beta Quadrupole magnets for HL-LHC

Author

Ambrosio, G., Amm, K., Anerella, M., Apollinari, G., Izquierdo, G. Arnau, Baldini, M., Ballarino, A., Barth, C., Yahia, A. Ben, Blowers, J., De Sousa, P. Borges, Bossert, R., Bulat, B., Carcagno, R., Cheng, D. W., Chlachidze, G., Cooley, L., Crouvizier, M., Devred, A., DiMarco, J., Feher, S., Ferracin, P., Troitino, J. Ferradas, Fajardo, L. Garcia, Gourlay, S., Hocker, H. M., Bermudez, S. Izquierdo, Joshi, P., Krave, S., Lee, E. M., Levitan, J., Lombardo, V., Lu, J., Marchevsky, M., Marinozzi, V., Moros, A., Muratore, J., Naus, M., Nobrega, F., Page, T., Pong, I., Perez, J. C., Prestemon, S., Ravaioli, E., Ray, K. L., Sabbi, G., Schmalzle, J., Seyl, J., Sgobba, S., Stoynev, S., Strauss, T., Todesco, E., Turrioni, D., Vallone, G., Van Weelderen, R., Wanderer, P., Wang, X., and Yu, M.

Subjects
Physics - Accelerator Physics
Abstract

By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low beta quadrupole magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC. This AUP effort is shared by BNL, Fermilab, and LBNL, with strand verification tests at NHMFL. An important step of the AUP QA plan is the testing of MQXFA magnets in a vertical cryostat at BNL. The acceptance criteria that could be tested at BNL were all met by the first four production magnets (MQXFA03-MQXFA06). Subsequently, two magnets (MQXFA07 and MQXFA08) did not meet some criteria and were disassembled. Lessons learned during the disassembly of MQXFA07 caused a revision to the assembly specifications that were used for MQXFA10 and subsequent magnets. In this paper, we present a summary of: 1) the fabrication and test data of all the MQXFA magnets; 2) the analysis of MQXFA07/A08 test results with characterization of the limiting mechanism; 3) the outcome of the investigation, including the lessons learned during MQXFA07 disassembly; and 4) the finite element analysis correlating observations with test performance.

Published
2023
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3. Muon Collider Forum Report

Author

Black, K. M., Jindariani, S., Li, D., Maltoni, F., Meade, P., Stratakis, D., Acosta, D., Agarwal, R., Agashe, K., Aime, C., Ally, D., Apresyan, A., Apyan, A., Asadi, P., Athanasakos, D., Bao, Y., Barzi, E., Bartosik, N., Bauerdick, L. A. T., Beacham, J., Belomestnykh, S., Berg, J. S., Berryhill, J., Bertolin, A., Bhat, P. C., Biagini, M. E., Bloom, K., Bose, T., Bross, A., Brost, E., Bruhwiler, N., Buonincontri, L., Buttazzo, D., Candelise, V., Canepa, A., Carpenter, L., Casarsa, M., Celiberto, F., Cesarotti, C., Chachamis, G., Chacko, Z., Chang, P., Chekanov, S. V., Chen, T. Y., Chiesa, M., Cohen, T., Costa, M., Craig, N., Crivellin, A., Curatolo, C., Curtin, D., Da Molin, G., Dasu, S., de Gouvea, A., Denisov, D., Dermisek, R., Di Petrillo, K. F., Dorigo, T., Duarte, J. M., Elvira, V. D., Essig, R., Everaerts, P., Fan, J., Felcini, M., Fiore, G., Fiorina, D., Forslund, M., Franceschini, R., Garzelli, M. V., Gerber, C. E., Giambastiani, L., Giove, D., Guiducci, S., Han, T., Hermanek, K., Herwig, C., Hirschauer, J., Holmes, T. R., Homiller, S., Horyn, L. A., Ivanov, A., Jayatilaka, B., Jia, H., Jung, C. K., Kahn, Y., Kaplan, D. M., Kaur, M., Kawale, M., Koppenburg, P., Krintiras, G., Krizka, K., Kuchma, B., Lee, L., Li, L., Li, P., Li, Q., Li, W., Lipton, R., Liu, Z., Lomte, S., Lu, Q., Lucchesi, D., Luo, T., Lyu, K., Ma, Y., Machado, P. A. N., Madrid, C., Mahon, D. J., Mazzacane, A., McGinnis, N., McLean, C., Mele, B., Meloni, F., Middleton, S. C., Mishra, R. K., Mokhov, N., Montella, A., Morandin, M., Nagaitsev, S., Nardi, F., Neubauer, M. S., Neuffer, D. V., Newman, H., Ogaz, R., Ojalvo, I., Oksuzian, I., Orimoto, T., Ozek, B., Pachal, K., Griso, S. Pagan, Panci, P., Papadimitriou, V., Pastrone, N., Pedro, K., Pellemoine, F., Perloff, A., Pinna, D., Piccinini, F., Pleier, Marc-Andre, Posen, S., Potamianos, K., Rappoccio, S., Reece, M., Reina, L., Hall, A. Reinsvold, Riccardi, C., Ristori, L., Robens, T., Ruiz, R., Sala, P., Schulte, D., Sestini, L., Shiltsev, V., Snopok, P., Stark, G., Stupak III, J., Su, S ., Sundrum, R., Swiatlowski, M., Syphers, M. J., Taffard, A., Thompson, W., Torun, Y., Tully, C. G., Vai, I., Valente, M., van Rienen, U., van Weelderen, R., Velev, G., Venkatasubramanian, N., Vittorio, L., Vuosalo, C., Wang, X., Weber, H., Wu, R., Wu, Y., Wulzer, A., Xie, K., Xie, S., Yohay, R., Yonehara, K., Yu, F., Zlobin, A. V., Zuliani, D., and Zurita, J.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

A multi-TeV muon collider offers a spectacular opportunity in the direct exploration of the energy frontier. Offering a combination of unprecedented energy collisions in a comparatively clean leptonic environment, a high energy muon collider has the unique potential to provide both precision measurements and the highest energy reach in one machine that cannot be paralleled by any currently available technology. The topic generated a lot of excitement in Snowmass meetings and continues to attract a large number of supporters, including many from the early career community. In light of this very strong interest within the US particle physics community, Snowmass Energy, Theory and Accelerator Frontiers created a cross-frontier Muon Collider Forum in November of 2020. The Forum has been meeting on a monthly basis and organized several topical workshops dedicated to physics, accelerator technology, and detector R&D. Findings of the Forum are summarized in this report.

Published
2022

4. Challenges and Lessons Learned From Fabrication, Testing, and Analysis of Eight MQXFA Low Beta Quadrupole Magnets for HL-LHC

Author

Ambrosio, Giorgio, Amm, Kathleen, Anerella, Michael, Apollinari, Giorgio, Izquierdo, Gonzalo Arnau, Baldini, Maria, Ballarino, Amalia, Barth, Christian, Yahia, Anis Ben, Blowers, James, De Sousa, P Borges, Bossert, R, Bulat, Bartosz Wojciech, Carcagno, Ruben H, Cheng, Daniel W, Chlachidze, G, Cooley, Lance, Crouvizier, Mickael, Devred, Arnaud, DiMarco, Joseph, Feher, Sandor, Ferracin, Paolo, Troitino, Jose Ferradas, Fajardo, Laura Garcia, Gourlay, S, Hocker, Henry M, Bermudez, Susana Izquierdo, Joshi, Piyush, Krave, Steven T, Lee, Elizabeth Marie, Levitan, Jeremy W, Lombardo, Vito, Lu, Jun, Marchevsky, Maxim, Marinozzi, Vittorio, Moros, Alice, Muratore, Joseph F, Naus, Michael, Nobrega, Alfred, Page, T, Pong, Ian, Perez, JC, Prestemon, Soren, Ray, Katherine L, Sabbi, GianLuca, Schmalzle, Jesse, Seyl, J, Sgobba, Stefano, Stoynev, S, Strauss, T, Todesco, Ezio, Turrioni, Daniele, Vallone, Giorgio, Van Weelderen, R, Wanderer, P, Wang, X, and Yu, Miao

Subjects
Nuclear and Plasma Physics, Physical Sciences, Accelerator magnets, HL-LHC, Nb3Sn, super-conducting magnets, ATAP-GENERAL, ATAP-SMP, ATAP-2023, Condensed Matter Physics, Electrical and Electronic Engineering, Materials Engineering, General Physics, Electrical engineering, Condensed matter physics
Abstract

By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low-beta quadrupole magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC. This AUP effort is shared by BNL, Fermilab, and LBNL, with strand verification tests at NHMFL. An important step of the AUP QA plan is the testing of MQXFA magnets in a vertical cryostat at BNL. The acceptance criteria that could be tested at BNL were all met by the first four production magnets (MQXFA03-MQXFA06). Subsequently, two magnets (MQXFA07 and MQXFA08) did not meet some of the criteria and were disassembled. Lessons learned during the disassembly of MQXFA07 caused a revision to the assembly specifications that were used for MQXFA10 and subsequent magnets. In this article, we present a summary of: 1) the fabrication and test data for all the MQXFA magnets; 2) the analysis of MQXFA07/A08 test results with characterization of the limiting mechanism; 3) the outcome of the investigation, including the lessons learned during MQXFA07 disassembly; and 4) the finite element analysis correlating observations with test performance.

Published
2023

5. Cryogenics for the HL-LHC

Author

Claudet, S., primary, Ferlin, G., additional, Monneret, E., additional, Perin, A., additional, Sisti, M., additional, Van Weelderen, R., additional, Lees, A., additional, Gahier, V., additional, Brodzinski, K., additional, and Delprat, L., additional

Published
2024
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6. Superconducting Magnet Technology for the IR Upgrade

Author

Todesco, E., primary, Ambrosio, G., additional, Ferracin, P., additional, Sabbi, G. L., additional, Nakamoto, T., additional, Sugano, M., additional, Van Weelderen, R., additional, Fabbricatore, P., additional, Farinon, S., additional, Toral, F., additional, Sorbi, M., additional, Statera, M., additional, Xu, Q., additional, Rifflet, J. M., additional, and Felice, H., additional

Published
2024
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7. Muon Collider Forum report

Author

Black, K.M., primary, Jindariani, S., additional, Li, D., additional, Maltoni, F., additional, Meade, P., additional, Stratakis, D., additional, Acosta, D., additional, Agarwal, R., additional, Agashe, K., additional, Aimè, C., additional, Ally, D., additional, Apresyan, A., additional, Apyan, A., additional, Asadi, P., additional, Athanasakos, D., additional, Bao, Y., additional, Bartosik, N., additional, Barzi, E., additional, Bauerdick, L.A.T., additional, Beacham, J., additional, Belomestnykh, S., additional, Berg, J.S., additional, Berryhill, J., additional, Bertolin, A., additional, Bhat, P.C., additional, Biagini, M.E., additional, Bloom, K., additional, Bose, T., additional, Bross, A., additional, Brost, E., additional, Bruhwiler, N., additional, Buonincontri, L., additional, Buttazzo, D., additional, Candelise, V., additional, Canepa, A., additional, Capdevilla, R., additional, Carpenter, L., additional, Casarsa, M., additional, Celiberto, F., additional, Cesarotti, C., additional, Chachamis, G., additional, Chacko, Z., additional, Chang, P., additional, Chekanov, S.V., additional, Chen, T.Y., additional, Chiesa, M., additional, Cohen, T., additional, Costa, M., additional, Craig, N., additional, Crivellin, A., additional, Curatolo, C., additional, Curtin, D., additional, Da Molin, G., additional, Dasu, S., additional, de Gouvêa, A., additional, Denisov, D., additional, Dermisek, R., additional, Di Petrillo, K.F., additional, Dorigo, T., additional, Duarte, J.M., additional, Elvira, V.D., additional, Essig, R., additional, Everaerts, P., additional, Fan, J., additional, Felcini, M., additional, Fiore, G., additional, Fiorina, D., additional, Forslund, M., additional, Franceschini, R., additional, Garzelli, M.V., additional, Gerber, C.E., additional, Giambastiani, L., additional, Giove, D., additional, Guiducci, S., additional, Han, T., additional, Hermanek, K., additional, Herwig, C., additional, Hirschauer, J., additional, Holmes, T.R., additional, Homiller, S., additional, Horyn, L.A., additional, Ivanov, A., additional, Jayatilaka, B., additional, Jia, H., additional, Jung, C.K., additional, Kahn, Y., additional, Kaplan, D.M., additional, Kaur, M., additional, Kawale, M., additional, Koppenburg, P., additional, Krintiras, G., additional, Krizka, K., additional, Kuchma, B., additional, Lee, L., additional, Li, L., additional, Li, P., additional, Li, Q., additional, Li, W., additional, Lipton, R., additional, Liu, Z., additional, Lomte, S., additional, Lu, Q., additional, Lucchesi, D., additional, Luo, T., additional, Lyu, K., additional, Ma, Y., additional, Machado, P.A.N., additional, Madrid, C., additional, Mahon, D.J., additional, Mazzacane, A., additional, McGinnis, N., additional, McLean, C., additional, Mele, B., additional, Meloni, F., additional, Middleton, S.C., additional, Mishra, R.K., additional, Mokhov, N., additional, Montella, A., additional, Morandin, M., additional, Nagaitsev, S., additional, Nardi, F., additional, Neubauer, M.S., additional, Neuffer, D.V., additional, Newman, H., additional, Ogaz, R., additional, Ojalvo, I., additional, Oksuzian, I., additional, Orimoto, T., additional, Ozek, B., additional, Pachal, K., additional, Pagan Griso, S., additional, Panci, P., additional, Papadimitriou, V., additional, Pastrone, N., additional, Pedro, K., additional, Pellemoine, F., additional, Perloff, A., additional, Pinna, D., additional, Piccinini, F., additional, Pleier, Marc-André, additional, Posen, S., additional, Potamianos, K., additional, Rappoccio, S., additional, Reece, M., additional, Reina, L., additional, Reinsvold Hall, A., additional, Riccardi, C., additional, Ristori, L., additional, Robens, T., additional, Ruiz, R., additional, Sala, P., additional, Schulte, D., additional, Sestini, L., additional, Shiltsev, V., additional, Snopok, P., additional, Stark, G., additional, Stupak III, J., additional, Su, S., additional, Sundrum, R., additional, Swiatlowski, M., additional, Syphers, M.J., additional, Taffard, A., additional, Thompson, W., additional, Torun, Y., additional, Tully, C.G., additional, Vai, I., additional, Valente, M., additional, van Rienen, U., additional, van Weelderen, R., additional, Velev, G., additional, Venkatasubramanian, N., additional, Vittorio, L., additional, Vuosalo, C., additional, Wang, X., additional, Weber, H., additional, Wu, R., additional, Wu, Y., additional, Wulzer, A., additional, Xie, K., additional, Xie, S., additional, Yohay, R., additional, Yonehara, K., additional, Yu, F., additional, Zlobin, A.V., additional, Zuliani, D., additional, and Zurita, J., additional

Published
2024
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8. Commissioning of the cryogenics of the LHC long straight sections

Author

Perin, A., Casas-Cubillos, J., Claudet, S., Darve, C., Ferlin, G., Millet, F., Parente, C., Rabehl, R., Soubiran, M., van Weelderen, R., and Wagner, U.

Subjects
Physics - Accelerator Physics
Abstract

The LHC is made of eight circular arcs interspaced with eight Long Straight Sections (LSS). Most powering interfaces to the LHC are located in these sections where the particle beams are focused and shaped for collision, cleaning and acceleration. The LSSs are constituted of several unique cryogenic devices and systems like electrical feed-boxes, standalone superconducting magnets, superconducting links, RF cavities and final focusing superconducting magnets. This paper presents the cryogenic commissioning and the main results obtained during the first operation of the LHC Long Straight Sections., Comment: 8 pp. Cryogenic Engineering Conference and International Cryogenic Materials Conference, 28 Jun - 2 Jul 2009. Tucson, Arizona

Published
2012
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9. Magnets for a Muon Collider—Needs and Plans

Author

Bottura, L., Accettura, C., Amemiya, N., Auchmann, B., Berg, J.S., Bersani, A., Bertarelli, A., Boattini, F., Bordini, B., Borges de Sousa, P., Breschi, M., Caiffi, B., Chaud, X., Debray, F., Dudarev, A., Eisterer, M., Fabbri, S., Farinon, S., Ferracin, P., De Gersem, H., Kario, A., Kolehmainen, A., Kosse, J., Lorenzo Gomez, J., Losito, R., Mariotto, S., Mentink, M., Mulder, T., Musenich, R., Novelli, D., Ogitsu, T., Palmer, M., Pavan, J., Piekarz, H., Portone, A., Quettier, L., Rochepault, E., Rossi, L., Salmi, T., Schneider-Muntau, H., Senatore, C., Statera, M., Ten Kate, H.H.J., Testoni, P., Vallone, G., Verweij, A., Van Weelderen, R., Wozniak, M., Yamamoto, A., Yang, Y., Zhai, Y., and Zlobin, A.

Abstract

We describe the magnet challenges for a Muon Collider, an exciting option considered for the future of particle physics at the energy frontier. Starting from the comprehensive work performed by the US Muon Accelerator Program, we have reviewed the performance specifications dictated by beam physics and the operating conditions to satisfy the accelerator needs. Among the many magnets that make up a muon collider, we have identified four systems that represent well the envelope of challenges: the target and capture solenoid, the final cooling solenoid, the accelerator dipoles and the collider dipoles. These systems provide focus for the development of novel concepts, largely based on HTS for reasons of performance, cost and sustainability. After giving a consolidated overview of the needs for the magnet systems, we describe here the basic technology options considered, and the plan for design and development activities.

Published
2024
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10. Prognostic significance of chromosomal abnormalities at relapse in children with relapsed acute myeloid leukemia: A retrospective cohort study of the Relapsed AML 2001/01 Study

Author

Klein, K, Beverloo, H, Zimmermann, M, Raimondi, S, von Neuhoff, C, de Haas, V, van Weelderen, R, Cloos, J, Abrahamsson, J, Bertrand, Y, Dworzak, M, Fynn, A, Gibson, B, Ha, S, Harrison, C, Hasle, H, Elitzur, S, Leverger, G, Maschan, A, Razzouk, B, Reinhardt, D, Rizzari, C, Smisek, P, Creutzig, U, Kaspers, G, Klein K., Beverloo H. B., Zimmermann M., Raimondi S. C., von Neuhoff C., de Haas V., van Weelderen R., Cloos J., Abrahamsson J., Bertrand Y., Dworzak M., Fynn A., Gibson B., Ha S. -Y., Harrison C. J., Hasle H., Elitzur S., Leverger G., Maschan A., Razzouk B., Reinhardt D., Rizzari C., Smisek P., Creutzig U., Kaspers G. J. L., Klein, K, Beverloo, H, Zimmermann, M, Raimondi, S, von Neuhoff, C, de Haas, V, van Weelderen, R, Cloos, J, Abrahamsson, J, Bertrand, Y, Dworzak, M, Fynn, A, Gibson, B, Ha, S, Harrison, C, Hasle, H, Elitzur, S, Leverger, G, Maschan, A, Razzouk, B, Reinhardt, D, Rizzari, C, Smisek, P, Creutzig, U, Kaspers, G, Klein K., Beverloo H. B., Zimmermann M., Raimondi S. C., von Neuhoff C., de Haas V., van Weelderen R., Cloos J., Abrahamsson J., Bertrand Y., Dworzak M., Fynn A., Gibson B., Ha S. -Y., Harrison C. J., Hasle H., Elitzur S., Leverger G., Maschan A., Razzouk B., Reinhardt D., Rizzari C., Smisek P., Creutzig U., and Kaspers G. J. L.

Abstract

Background: In addition to treatment response, cytogenetic and molecular aberrations are the most important prognostic factors in children with de novo acute myeloid leukemia (AML). However, little is known about cytogenetics at the time of relapse. Methods: This international study analyzed the prognostic value of cytogenetic profiles and karyotypic changes in pediatric relapsed AML in relation to the probability of event-free (pEFS) and overall survival (pOS). For this purpose, cytogenetic reports from all patients registered on the Relapsed AML 2001/01 Study were reviewed and classified. Results: Cytogenetic information at relapse was available for 403 (71%) of 569 registered patients. Frequently detected aberrations at relapse were t(8;21)(q22;q22) (n = 60) and inv(16)(p13.1q22)/t(16;16)(p13.1;q22) (n = 24), both associated with relatively good outcome (4-year pOS 59% and 71%, respectively). Monosomy 7/7q−, t(9;11)(p22;q23), t(10;11)(p12;q23), and complex karyotypes were associated with poor outcomes (4-year pOS 17%, 19%, 22%, and 22%, respectively). Of 261 (65%) patients for whom cytogenetic data were reliable at both diagnosis and relapse, pEFS was inferior for patients with karyotypic instability (n = 128, 49%), but pOS was similar. Unstable karyotypes with both gain and loss of aberrations were associated with inferior outcome. Early treatment response, time to relapse, and cytogenetic profile at time of relapse were the most important prognostic factors, both outweighing karytoypic instability per se. Conclusion: The cytogenetic subgroup at relapse is an independent risk factor for (event-free) survival. Cytogenetic assessment at the time of relapse is of high importance and may contribute to improved risk-adapted treatment for children with relapsed AML.

Published
2022

11. Measurable Residual Disease and Fusion Partner Independently Predict Survival and Relapse Risk in Childhood KMT2A -Rearranged Acute Myeloid Leukemia: A Study by the International Berlin-Frankfurt-Münster Study Group

Author

Van Weelderen, R. E., Klein, K., Harrison, C. J., Jiang, Y., Abrahamsson, J., Arad-Cohen, N., Bart-Delabesse, E., Buldini, B., De Moerloose, B., Dworzak, M. N., Elitzur, S., Fernandez Navarro, J. M., Gerbing, R. B., Goemans, B. F., De Groot-Kruseman, H. A., Guest, E., Ha, S. -Y., Hasle, H., Kelaidi, C., Lapillonne, H., Leverger, G., Locatelli, Franco, Masetti, R., Miyamura, T., Noren-Nystrom, U., Polychronopoulou, S., Rasche, M., Rubnitz, J. E., Stary, J., Tierens, A., Tomizawa, D., Zwaan, C. M., Kaspers, G. J. L., Locatelli F. (ORCID:0000-0002-7976-3654), Van Weelderen, R. E., Klein, K., Harrison, C. J., Jiang, Y., Abrahamsson, J., Arad-Cohen, N., Bart-Delabesse, E., Buldini, B., De Moerloose, B., Dworzak, M. N., Elitzur, S., Fernandez Navarro, J. M., Gerbing, R. B., Goemans, B. F., De Groot-Kruseman, H. A., Guest, E., Ha, S. -Y., Hasle, H., Kelaidi, C., Lapillonne, H., Leverger, G., Locatelli, Franco, Masetti, R., Miyamura, T., Noren-Nystrom, U., Polychronopoulou, S., Rasche, M., Rubnitz, J. E., Stary, J., Tierens, A., Tomizawa, D., Zwaan, C. M., Kaspers, G. J. L., and Locatelli F. (ORCID:0000-0002-7976-3654)

Abstract

PURPOSEA previous study by the International Berlin-Frankfurt-Münster Study Group (I-BFM-SG) on childhood KMT2A-rearranged (KMT2A-r) AML demonstrated the prognostic value of the fusion partner. This I-BFM-SG study investigated the value of flow cytometry-based measurable residual disease (flow-MRD) and evaluated the benefit of allogeneic stem-cell transplantation (allo-SCT) in first complete remission (CR1) in this disease.METHODSA total of 1,130 children with KMT2A-r AML, diagnosed between January 2005 and December 2016, were assigned to high-risk (n = 402; 35.6%) or non-high-risk (n = 728; 64.4%) fusion partner-based groups. Flow-MRD levels at both end of induction 1 (EOI1) and 2 (EOI2) were available for 456 patients and were considered negative (<0.1%) or positive (%0.1%). End points were 5-year event-free survival (EFS), cumulative incidence of relapse (CIR), and overall survival (OS).RESULTSThe high-risk group had inferior EFS (30.3% high risk v 54.0% non-high risk; P <.0001), CIR (59.7% v 35.2%; P <.0001), and OS (49.2% v 70.5%; P <.0001). EOI2 MRD negativity was associated with superior EFS (n = 413; 47.6% MRD negativity v n = 43; 16.3% MRD positivity; P <.0001) and OS (n = 413; 66.0% v n = 43; 27.9%; P <.0001), and showed a trend toward lower CIR (n = 392; 46.1% v n = 26; 65.4%; P =.016). Similar results were obtained for patients with EOI2 MRD negativity within both risk groups, except that within the non-high-risk group, CIR was comparable with that of patients with EOI2 MRD positivity. Allo-SCT in CR1 only reduced CIR (hazard ratio, 0.5 [95% CI, 0.4 to 0.8]; P =.00096) within the high-risk group but did not improve OS. In multivariable analyses, EOI2 MRD positivity and high-risk group were independently associated with inferior EFS, CIR, and OS.CONCLUSIONEOI2 flow-MRD is an independent prognostic factor and should be included as risk stratification factor in childhood KMT2A-r AML. Treatment approaches other than allo-SCT in CR1 are nee

Published
2023

28. Superconducting Magnet Technology for the Upgrade

Author

Todesco, E., primary, Ambrosio, G., additional, Ferracin, P., additional, Rifflet, J. M., additional, Sabbi, G. L., additional, Segreti, M., additional, Nakamoto, T., additional, van Weelderen, R., additional, and Xu, Q., additional

Published
2015
Full Text
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29. Cryogenics for HL-LHC

Author

Tavian, L., primary, Brodzinski, K., additional, Claudet, S., additional, Ferlin, G., additional, Wagner, U., additional, and van Weelderen, R., additional

Published
2015
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30. Cryogenics for the HL-LHC

Author

Claudet, S., Ferlin, G., Monneret, E., Perin, A., Pirotte, O., Sisti, M., and Van Weelderen, R.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Accelerator Physics
Abstract

The upgrade of the cryogenics for the HL-LHC will consist of the following: • - The design and installation of two new cryogenic plants at P1 and P5 for high luminosity insertions. This upgrade will be based on a new sectorization scheme aimed at separating the cooling of the magnets in these insertion regions from the arc magnets and considering the newt feedboxes and superconducting links located in underground infrastructures. • - The design and installation of a new cryogenic distribution lines (QXL) at P1 and P5 in the LHC tunnel and in a new underground service galleries. • - The upgrade of the existing cryogenic plant (QSRA and QURA) cooling the LHC sector 3-4 located at P4. • - The cryogenic design support for superconducting devices, such as magnets, crab cavities, superconducting links, and the hollow electron lenses. Some other options such as new cryogenic circuits at P7 for the HTS links and displaced current feedboxes or a new cryoplant in P4 have been discarded., CERN Yellow Reports: Monographs, Vol. 10 (2020): High-Luminosity Large Hadron Collider (HL-LHC): Technical design report

Published
2020
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31. High-Luminosity Large Hadron Collider (HL-LHC): Technical design report

Author

Aberle, O., Béjar Alonso, I, Brüning, O, Fessia, P, Rossi, L, Tavian, L, Zerlauth, M, Adorisio, C., Adraktas, A., Ady, M., Albertone, J., Alberty, L., Alcaide Leon, M., Alekou, A., Alesini, D., Ferreira, B. Almeida, Lopez, P. Alvarez, Ambrosio, G., Andreu Munoz, P., Anerella, M., Angal-Kalinin, D., Antoniou, F., Apollinari, G., Apollonio, A., Appleby, R., Arduini, G., Alonso, B. Arias, Artoos, K., Atieh, S., Auchmann, B., Badin, V., Baer, T., Baffari, D., Baglin, V., Bajko, M., Ball, A., Ballarino, A., Bally, S., Bampton, T., Banfi, D., Barlow, R., Barnes, M., Barranco, J., Barthelemy, L., Bartmann, W., Bartosik, H., Barzi, E., Battistin, M., Baudrenghien, P., Alonso, I. Bejar, Belomestnykh, S., Benoit, A., Ben-Zvi, I., Bertarelli, A., Bertolasi, S., Bertone, C., Bertran, B., Bestmann, P., Biancacci, N., Bignami, A., Bliss, N., Boccard, C., Body, Y., Borburgh, J., Bordini, B., Borralho, F., Bossert, R., Bottura, L., Boucherie, A., Bozzi, R., Bracco, C., Bravin, E., Bregliozzi, G., Brett, D., Broche, A., Brodzinski, K., Broggi, F., Bruce, R., Brugger, M., Brüning, O., Buffat, X., Burkhardt, H., Burnet, J., Burov, A., Burt, G., Cabezas, R., Cai, Y., Calaga, R., Calatroni, S., Capatina, O., Capelli, T., Cardon, P., Carlier, E., Carra, F., Carvalho, A., Carver, L.R., Caspers, F., Cattenoz, G., Cerutti, F., Chancé, A., Rodrigues, M. Chastre, Chemli, S., Cheng, D., Chiggiato, P., Chlachidze, G., Claudet, S., Coello De Portugal, JM., Collazos, C., Corso, J., Costa Machado, S., Costa Pinto, P., Coulinge, E., Crouch, M., Cruikshank, P., Cruz Alaniz, E., Czech, M., Dahlerup-Petersen, K., Dalena, B., Daniluk, G., Danzeca, S., Day, H., De Carvalho Saraiva, J., De Luca, D., De Maria, R., De Rijk, G., De Silva, S., Dehning, B., Delayen, J., Deliege, Q., Delille, B., Delsaux, F., Denz, R., Devred, A., Dexter, A., Di Girolamo, B., Dietderich, D., Dilly, J.W., Doherty, A., Dos Santos, N., Drago, A., D.Drskovic, Ramos, D. Duarte, Ducimetière, L., Efthymiopoulos, I., Einsweiler, K., Esposito, L., Esteban Muller, J., Evrard, S., Fabbricatore, P., Farinon, S., Fartoukh, S., Faus-Golfe, A., Favre, G., Felice, H., Feral, B., Ferlin, G., Ferracin, P., Ferrari, A., Ferreira, L., Fessia, P., Ficcadenti, L., Fiotakis, S., Fiscarelli, L., Fitterer, M., Fleiter, J., Foffano, G., Fol, E., Folch, R., Foraz, K., Foussat, A., Frankl, M., Frasciello, O., Fraser, M., Menendez, P. Freijedo, Fuchs, J-F., Furuseth, S., Gaddi, A., Gallilee, M., Gallo, A., Alia, R. Garcia, Gavela, H. Garcia, Matos, J. Garcia, Garcia Morales, H., Valdivieso, A. Garcia-Tabares, Garino, C., Garion, C., Gascon, J., Gasnier, Ch., Gentini, L., Gentsos, C., Ghosh, A., Giacomel, L., Hernandez, K. Gibran, Gibson, S., Ginburg, C., Giordano, F., Giovannozzi, M., Goddard, B., Gomes, P., Gonzalez De La Aleja Cabana, M., Goudket, P., Gousiou, E., Gradassi, P., Costa, A. Granadeiro, Grand-Clément, L., Grillot, S., Guillaume, JC., Guinchard, M., Hagen, P., Hakulinen, T., Hall, B., Hansen, J., Heredia Garcia, N., Herr, W., Herty, A., Hill, C., Hofer, M., Höfle, W., Holzer, B., Hopkins, S., Hrivnak, J., Iadarola, G., Infantino, A., Bermudez, S. Izquierdo, Jakobsen, S., Jebramcik, M.A., Jenninger, B., Jensen, E., Jones, M., Jones, R., Jones, T., Jowett, J., Juchno, M., Julie, C., Junginger, T., Kain, V., Kaltchev, D., Karastathis, N., Kardasopoulos, P., Karppinen, M., Keintzel, J., Kersevan, R., Killing, F., Kirby, G., Korostelev, M., Kos, N., Kostoglou, S., Kozsar, I., Krasnov, A., Krave, S., Krzempek, L., Kuder, N., Kurtulus, A., Kwee-Hinzmann, R., Lackner, F., Lamont, M., Lamure, A.L., m, L. Lari, Lazzaroni, M., Le Garrec, M., Lechner, A., Lefevre, T., Leuxe, R., Li, K., Li, Z., Lindner, R., Lindstrom, B., Lingwood, C., Löffler, C., Lopez, C., Lopez-Hernandez, LA., Losito, R., Maciariello, F., Macintosh, P., Maclean, E.H., Macpherson, A., Maesen, P., Magnier, C., Durand, H. Mainaud, Malina, L., Manfredi, M., Marcellini, F., Marchevsky, M., Maridor, S., Marinaro, G., Marinov, K., Markiewicz, T., Marsili, A., Martinez Urioz, P., Martino, M., Masi, A., Mastoridis, T., Mattelaer, P., May, A., Mazet, J., Mcilwraith, S., McIntosh, E., Medina Medrano, L., Mejica Rodriguez, A., Mendes, M., Menendez, P., Mensi, M., Mereghetti, A., Mergelkuhl, D., Mertens, T., Mether, L., Métral, E., Migliorati, M., Milanese, A., Minginette, P., Missiaen, D., Mitsuhashi, T., Modena, M., Mokhov, N., Molson, J., Monneret, E., Montesinos, E., Moron-Ballester, R., Morrone, M., Mostacci, A., Mounet, N., Moyret, P., Muffat, P., Muratori, B., Muttoni, Y., Nakamoto, T., Navarro-Tapia, M., Neupert, H., Nevay, L., Nicol, T., Nilsson, E., Ninin, P., Nobrega, A., Noels, C., Nolan, E., Nosochkov, Y., Nuiry, FX., Oberli, L., Ogitsu, T., Ohmi, K., Olave R., Oliveira, J., Orlandi, Ph., Ortega, P., Osborne, J., Otto, T., Palumbo, L., Papadopoulou, S., Papaphilippou, Y., Paraschou, K., Parente, C., Paret, S., Park, H., Parma, V., Pasquino, Ch., Patapenka, A., Patnaik, L., Pattalwar, S., Payet, J., Pechaud, G., Pellegrini, D., Pepinster, P., Perez, J., Espinos, J. Perez, Marcone, A. Perillo, Perin, A., Perini, P., Persson, T.H.B., Peterson, T., Pieloni, T., Pigny, G., Pinheiro de Sousa, J.P., Pirotte, O., Plassard, F., Pojer, M., Pontercorvo, L., Poyet, A., Prelipcean, D., Prin, H., Principe, R., Pugnat, T., Qiang, J., Quaranta, E., Rafique, H., Rakhno, I., Duarte, D. Ramos, Ratti, A., Ravaioli, E., Raymond, M., Redaelli, S., Renaglia, T., Ricci, D., Riddone, G., Rifflet, J., Rigutto, E., Rijoff, T., Rinaldesi, R., Riu Martinez, O., Rivkin, L., Rodriguez Mateos, F., Roesler, S., Romera Ramirez, I., Rossi, A., Rossi, L., Rude, V., Rumolo, G., Rutkovksi, J., Sabate Gilarte, M., Sabbi, G., Sahner, T., Salemme, R., Salvant, B., Galan, F. Sanchez, Santamaria Garcia, A., Santillana, I., Santini, C., Santos, O., Diaz, P. Santos, Sasaki, K., Savary, F., Sbrizzi, A., Schaumann, M., Scheuerlein, C., Schmalzle, J., Schmickler, H., Schmidt, R., Schoerling, D., Segreti, M., Serluca, M., Serrano, J., Sestak, J., Shaposhnikova, E., Shatilov, D., Siemko, A., Sisti, M., Sitko, M., Skarita, J., Skordis, E., Skoufaris, K., Skripka, G., Smekens, D., Sobiech, Z., Sosin, M., Sorbio, M., Soubelet, F., Spataro, B., Spiezia, G., Stancari, G., Staterao, M., Steckert, J., Steele, G., Sterbini, G., Struik, M., Sugano, M., Szeberenyi, A., Taborelli, M., Tambasco, C., Rego, R. Tavares, Tavian, L., Teissandier, B., Templeton, N., Therasse, M., Thiesen, H., Thomas, E., Toader, A., Todesco, E., Tomás, R., Toral, F., Torres-Sanchez, R., Trad, G., Triantafyllou, N., Tropin, I., Tsinganis, A., Tuckamantel, J., Uythoven, J., Valishev, A., Van Der Veken, F., Van Weelderen, R., Vande Craen, A., Vazquez De Prada, B., Velotti, F., Verdu Andres, S., Verweij, A., Shetty, N. Vittal, Vlachoudis, V., Volpini, G., Wagner, U., Wanderer, P., Wang, M., Wang, X., Wanzenberg, R., Wegscheider, A., Weisz, S., Welsch, C., Wendt, M., Wenninger, J., Weterings, W., White, S., Widuch, K., Will, A., Willering, G., Wollmann, D., Wolski, A., Wozniak, J., Wu, Q., Xiao, B., Xiao, L., Xu, Q., Yakovlev, Y., Yammine, S., Yang, Y., Yu, M., Zacharov, I., Zagorodnova, O., Zannini, C., Zanoni, C., Zerlauth, M., Zimmermann, F., Zlobin, A., Zobov, M., and Zurbano Fernandez, I.

Subjects
Accelerators and Storage Rings
Abstract

The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. Since opening up anew energy frontier for exploration in 2010, it has gathered a global user community of about 9000 scientists working in fundamental particle physics and the physics of hadronic matter at extreme temperature and density. To sustain and extend its discovery potential, the LHC will need a major upgrade in the 2020s. This will increase its instantaneous luminosity (rate of collisions) by a factor of five beyond the original design valueand the integrated luminosity (totalnumber of collisions) by a factor ten. The LHC is already a highly complexand exquisitely optimised machine so this upgrade must be carefully conceived and will require new infrastructures(underground and on surface)and over a decade to implement. The new configuration, known as High Luminosity LHC (HL-LHC), relies on a number of key innovations that push accelerator technology beyond its present limits. Among these are cutting-edge 11–12Tesla superconducting magnets, compact superconducting cavities for beam rotation with ultra-precise phase control, new technology and physical processes for beam collimation and 100 metre-long high-power superconducting links with negligible energy dissipation, all of which required several years of dedicated R&D; effort on a global international level. The present document describes the technologies and components that will be used to realise the projectand is intended to serve as the basis for the detailed engineering design of the HL-LHC.

Published
2020

40. Status of the Superconducting Proton Linac (SPL) Cryo-Module

Author

Parma, V, Bonomi, R, Capatina, O, Chambrillon, J, Montesinos, E, Schirm, K, Vande Craen, A, Vandoni, G, and Van Weelderen, R

Subjects
Accelerators and Storage Rings
Abstract

The Superconducting Proton Linac (SPL) is an R&D effort conducted by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art SRF technology. Such an accelerator could serve as a driver in new physics facilities for neutrinos and/or radioactive ion beams [1]. Amongst the main objectives of this effort, are the development of 704 MHz bulk niobium beta=1 elliptical cavities (operating at 2 K and providing an accelerating gradient of 25 MV/m) and the test of a string of cavities integrated in a machine-type cryo-module. In an initial phase, only four out of the eight cavities of the SPL cryo-module will be tested in a half-length cryo-module developed for this purpose, which nonetheless preserves the main features of the full size module. This paper presents the final design of the cryo-module and the status of the construction of the main cryostat parts. Preliminary plans for the assembly and testing of the cryo-module at CERN are also presented.

Published
2014

41. Heat transfer through the electrical insulation of Nb$_{3}$Sn cables

Author

Granieri, P, Hincapié, L, and van Weelderen, R

Subjects
Accelerators and Storage Rings
Abstract

For the LHC upgrade projects, CERN will rely on the Nb$_{3}$Sn technology to build high field dipole and quadrupole superconducting magnets. In the frame of this R&D program, cooling studies are carried out to determine the heat extraction from this new type of accelerator magnets and the relevant quench limits. In this paper we present and discuss experimental results of heat transfer through the electrical insulation of Nb$_{3}$Sn cables. A cable-stack was prepared using fiberglass sleeves and CTD-101K impregnation resin. Two different measurement methods were compared, consisting of instrumenting the sample before or after the vacuum impregnation. The tests were performed both in 1.9 K superfluid and 4.2 K liquid helium baths, using different heating configurations. We also present results of the numerical model developed to reproduce the experimental results.

Published
2014

44. Cryogenic Beam Screens for High-Energy Particle Accelerators

Author

Baglin, V, Lebrun, P, Tavian, L, and van Weelderen, R

Subjects
Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

Applied superconductivity has become a key enabling technology for high-energy particle accelerators, thus making them large helium cryogenic systems operating at very low temperature. The circulation of high-intensity particle beams in these machines generates energy deposition in the first wall through different processes. For thermodynamic efficiency, it is advisable to intercept these beam-induced heat loads, which may be large in comparison with cryostat heat in-leaks, at higher temperature than that of the superconducting magnets of the accelerator, by means of beam screens located in the magnet apertures. Beam screens may also be used as part of the ultra-high vacuum system of the accelerator, by sheltering the gas molecules cryopumped on the beam pipe from impinging radiation and thus avoiding pressure runaway. Space being extremely tight in the magnet apertures, cooling of the long, slender beam screens also raises substantial problems in cryogenic heat transfer and fluid flow. We present sizing rules and technical solutions for such beam screens, as applied to the existing Large Hadron Collider (LHC) and its upgrades under study.

Published
2013

45. Simulation Study of Cool-Down of the CLIC Wiggler Magnets

Author

Liu, L, Perin, A, van Weelderen, R, and Xiong, L

Subjects
Accelerators and Storage Rings
Abstract

The cryogenic system for the CLIC wiggler magnets is under design. The cooldown process is one of the main dimensioning factors for the system. In this paper, the heat transfer model used to simulate the cool-down process is presented. Different configurations are then investigated and a detailed analysis of the corresponding temperature evolutions along the magnet strings is calculated. The temperature profiles are evaluated for the flowing helium as well as for the magnets allowing a detailed analysis of the temperature gradients. The impact of some key parameters, like the mass-flow rate, the diameter of the cooling channels and of the thermal coupling between the helium and the magnets is also investigated.

Published
2013

46. The Cryogenic Design of the Phase I Upgrade Inner Triplet Magnets for LHC

Author

van Weelderen, R, Vullierme, B, and Peterson, T

Subjects
Physics::Instrumentation and Detectors, Accelerators and Storage Rings
Abstract

The LHC is operating with beam since end 2009. However, with the present interaction region magnets it cannot reach its nominal performance and a phased approach to upgrading them to reach that nominal performance is taken. The first phase of the LHC interaction region upgrade was approved by Council in December 2007. This phase relies on the mature Nb-Ti superconducting magnet technology with the target of increasing the LHC luminosity to 2 to 3×1034 cm-2s-1, while relying on the existing infrastructure which limits the total heat removal capacity at 1.9 K to 500 W. The Phase I Upgrade LHC interaction region final focus magnets will include four superconducting quadrupoles (low-β triplets) and one superconducting dipole (D1) cooled with pressurized, static superfluid helium (HeII) at 1.9 K. The heat absorbed in pressurized HeII, which may be more than 30 W/m due to dynamic heating from the particle beam halo, will be conducted to saturated He II at about 1.9 K and removed by the low pressure vapour. This paper discusses the conceptual design for the cryogenics of the Phase I Upgrade interaction region superconducting magnets and the integration of this magnet system into the overall LHC cryogenic system

Published
2011

47. The LHC cryogenic operation for first collisions and physics run

Author

Brodzinski, K, Barth, K, Benda, V, Bremer, J, Casas-Cubillos, J, Claudet, S, Delikaris, D, Ferlin, G, Fernandez Penacoba, G, Perin, A, Pirotte, O, Soubiran, M, Tavian, L, van Weelderen, R, and Wagner, U

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

The Large Hadron Collider (LHC) cryogenic system was progressively and successfully run for the LHC accelerator operation period starting from autumn 2009. The paper recalls the cryogenic system architecture and main operation principles. The system stability during magnets powering and availability periods for high energy beams with first collisions at 3.5 TeV are presented. Treatment of typical problems, weak points of the system and foreseen future consolidations will be discussed.

Published
2011

49. Conceptual Design of the LHC Interaction Region Upgrade: Phase-I

Author

Ostojic, R, Williams, L, Baglin, V, Ballarino, A, Cerutti, F, Denz, R, Fartoukh, S, Fessia, P, Foraz, K, Fürstner, M, Herr, Werner, Karppinen, M, Kos, N, Mainaud-Durand, H, Mereghetti, A, Muttoni, Y, Nisbet, D, Prin, H, Tock, J P, Van Weelderen, R, and Wildner, E

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

The LHC is starting operation with beam. The primary goal of CERN and the LHC community is to ensure that the collider is operated efficiently and that it achieves nominal performance in the shortest term. Since several years the community has been discussing the directions for maximizing the physics reach of the LHC by upgrading the experiments, in particular ATLAS and CMS, the LHC machine and the CERN proton injector complex, in a phased approach. The first phase of the LHC interaction region upgrade was approved by Council in December 2007. This phase relies on the mature Nb-Ti superconducting magnet technology with the target of increasing the LHC luminosity to 2 to 3 10^34 cm^-2s^-1, while maximising the use of the existing infrastructure. In this report, we present the goals and the proposed conceptual solutions for the LHC IR Upgrade Phase-I which include the recommendations of the conceptual design review.

Published
2008

50. Test Station for a 30 m long Superconducting Link

Author

Benda, V, Davison, C, Goiffon, T, Van Weelderen, R, and Roveta, G

Subjects
Accelerators and Storage Rings
Abstract

The Large Hadron Collider (LHC) requires distribution of high electrical currents in the limited space of LHC tunnel. Four superconducting links of about 76 m length and one of 510 m will be installed in the tunnel to carry 6Â kA and 600 A. For validation of the longest link a test station was designed which is presently under construction. The design will permit the test station to be adapted for other links and/or cables as well. It will operate either in pool boiling mode, in order to measure thermal loads, or in forced super-critical helium flow mode to simulate real operation. Inlet pressure is 1.2 bar to 3 bar. Inlet temperature is adjustable from 4.4 K up to about 20 K. The station is being prepared to validate the LHC model link, consisting of 48 superconducting cables, each operating at 600 A between 4.5 K and 5.4 K. This article describes features of the equipment.

Published
2007

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