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4 results on '"Hocker, Henry"'

1. 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

2. MQXFA Final Design Report

Author

Ambrosio, Giorgio, Amm, Kathleen, Anerella, Mike, Apollinari, Giorgio, Baldini, Maria, Yahia, Anis Ben, Blowers, James, Carcagno, Ruben, Cheng, Daniel, Chlachidze, Guram, Cooley, Lance, Feher, Sandor, Ferracin, Paolo, Hocker, Henry, Bermudez, Susana Izquierdo, Joshi, Piyush, Lombardo, Vito, Marinozzi, Vittorio, Muratore, Joseph, Naus, Michael, Nobrega, Fred, Pan, Heng, Parker, Marcellus, Pong, Ian, Prestemon, Soren, Ravaioli, Emmanuele, Ray, Katherine L., Sabbi, GianLuca, Schmalzle, Jesse, Todesco, Ezio, Turenne, Melanie, and Yu, Miao

Subjects
Physics - Accelerator Physics
Abstract

The MQXFA Quadrupole magnets will be installed in High Luminosity LHC to form the Q1 and Q3 inner triplet optical elements in front of the interaction points 1 (ATLAS) and 5 (CMS). A pair of MQXFA units is assembled in a stainless steel helium vessel, including the end domes, to make the Q1 Cold Mass or the Q3 Cold Mass. The US HL LHC Accelerator Upgrade Project* is responsible for the design, manufacturing and test of the Q1/Q3 Cold Masses and the complete MQXFA magnets. CERN provides the cryostat components and is responsible for integration and installation in HL LHC. The MQXFA quadrupoles have 150 mm aperture, 4.2 m magnetic length, nominal gradient of 132.2 T/m, and coil peak field of 11.3 T. They use Nb_3Sn conductor and a support structure made of segmented aluminum shells pre-loaded by using bladders and keys. This report presents the final design of the MQXFA quadrupole magnets. *Supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, Comment: 120 pages

Published
2022

3. The Interaction Region of the Electron-Ion Collider EIC

Author

Witte, Holger, Adam, Jaroslav, Anerella, Michael, Aschenauer, Elke, Berg, J., Blaskiewicz, Michael, Blednykh, Alexei, Christie, William, Cozzolino, John, Drees, Kirsten, Gamage, Bamunuvita, Gassner, David, Hamdi, Karim, Hetzel, Charles, Hocker, Henry, Holmes, Douglas, Jentsch, Alexander, Kiselev, Alexander, Kovach, Paul, Lovelace III, Henry, Luo, Yun, Mahler, George, Marone, Andrew, McIntyre, Gary, Michalski, Tim, Montag, Christoph, Morozov, Vasiliy, Palmer, Robert, Parker, Brett, Peggs, Steve, Plate, Stephen, Ptitsyn, Vadim, Robert-Demolaize, Guillaume, Runyan, Chris, Schmalzle, Jesse, Smith, Kevin, Stutzman, Marcy, Sullivan, Michael, Tepikian, Steven, Thieberger, Peter, Tuozzolo, Joseph, Willeke, Ferdinand, Wittmer, Walter, Wu, Qiong, and Zhang, Zhengqiao

Subjects
MC1: Circular and Linear Colliders, Physics::Accelerator Physics, Accelerator Physics
Abstract

This paper presents an overview of the Interaction Region (IR) design for the planned Electron-Ion Collider (EIC) at Brookhaven National Laboratory. The IR is designed to meet the requirements of the nuclear physics community *. The IR design features a ±4.5 m free space for the detector; a forward spectrometer magnet is used for the detection of hadrons scattered under small angles. The hadrons are separated from the neutrons allowing detection of neutrons up to ±4 mrad. On the rear side, the electrons are separated from photons using a weak dipole magnet for the luminosity monitor and to detect scattered electrons (e-tagger). To avoid synchrotron radiation backgrounds in the detector no strong electron bending magnet is placed within 40 m upstream of the IP. The magnet apertures on the rear side are large enough to allow synchrotron radiation to pass through the magnets. The beam pipe has been optimized to reduce the impedance; the total power loss in the central vacuum chamber is expected to be less than 90 W. To reduce risk and cost the IR is designed to employ standard NbTi superconducting magnets, which are described in a separate paper., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil

Published
2021
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