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1. High-gradient High-charge CW Superconducting RF gun with CsK2Sb photocathode

Author

Pinayev, Igor, Litvinenko, Vladimir N., Tuozzolo, Joseph, Brutus, Jean Clifford, Belomestnykh, Sergey, Boulware, Chase, Folz, Charles, Gassner, David, Grimm, Terry, Hao, Yue, Jamilkowski, James, Jing, Yichao, Kayran, Dmitry, Mahler, George, Mapes, Michael, Miller, Toby, Narayan, Geetha, Sheehy, Brian, Rao, Triveni, Skaritka, John, Smith, Kevin, Snydstrup, Louis, Than, Yatming, Wang, Erdong, Wang, Gang, Xiao, Binping, Xin, Tianmu, Zaltsman, Alexander, Altinbas, Z., Ben-Zvi, Ilan, Curcio, Anthony, Di Lieto, Anthony, Meng, Wuzheng, Minty, Michiko, Orfin, Paul, Reich, Jonathan, Roser, Thomas, Smart, Loralie A., Soria, Victor, Theisen, Charles, Xu, Wencan, Wu, Yuan H., and Zhao, Zhi

Subjects
Physics - Accelerator Physics
Abstract

High-gradient CW photo-injectors operating at high accelerating gradients promise to revolutionize many sciences and applications. They can establish the basis for super-bright monochromatic X-ray free-electron lasers, super-bright hadron beams, nuclear- waste transmutation or a new generation of microchip production. In this letter we report on our operation of a superconducting RF electron gun with a record-high accelerating gradient at the CsK2Sb photocathode (i.e. ~ 20 MV/m) generating a record-high bunch charge (i.e., 3 nC). We briefly describe the system and then detail our experimental results. This achievement opens new era in generating high-power electron beams with a very high brightness., Comment: 13 pager, 5 figures

Published
2015

2. Performance of 112 MHz SRF Gun at BNL

Author

Xin, Tianmu, Belomestnykh, Sergey, Ben-Zvi, Ilan, Boulware, Charles, Brutus, Jean Clifford, Folz, Charles, Grimm, Terry, Hayes, Thomas, Inacker, Patrick, Jing, Yichao, Kayran, Dmitry, Litvinenko, Vladimir, Ma, Jun, Mahler, George, Mapes, Michael, Mernick, Kevin, Mihara, Kentaro, Miller, Toby, Narayan, Geetha, Orfin, Paul, Petrushina, Irina, Pinayev, Igor, Polizzo, Salvatore, Rao, Triveni, Severino, Freddy, Shih, Kai, Skaritka, John, Smith, Kevin, Than, Roberto, Tuozzolo, Joseph, Wang, Erdong, Wang, Gang, Wu, Qiong, Xiao, Binping, Xu, Wencan, and Zaltsman, Alex

Subjects
Cavities - Design, Physics::Accelerator Physics, Accelerator Physics
Abstract

A 112 MHz SRF electron photoinjector (gun) was developed at Brookhaven National Laboratory to produce high-brightness and high-bunch-charge bunches for the coherent electron cooling proof-of-principle experiment. The gun is designed to deliver electrons with a kinetic energy of up to 2 MeV. Electrons are generated by illuminating a high quantum efficiency (QE) K2CsSb photoemission layer with a green laser operating at a wavelength of 532 nm. The gun was able to generating 3 nC bunches at 1.7 MeV. The design goals, fabrication, performance and operational experience are reported here., Proceedings of the 19th International Conference on RF Superconductivity, SRF2019, Dresden, Germany

Published
2019
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3. Commissioning of FEL-Based Coherent Electron Cooling System

Author

Litvinenko, Vladimir, Altinbas, Zeynep, Anderson, Richard, Belomestnykh, Sergey, Boulware, Charles, Brown, Kevin, Brutus, Jean Clifford, Curcio, Anthony, Di Lieto, Anthony, Folz, Charles, Gassner, David, Grimm, Terry, Hayes, Thomas, Hulsart, Robert, Inacker, Patrick, Jamilkowski, James, Jing, Yichao, Kayran, Dmitry, Kellermann, Robert, Lambiase, Robert, Mahler, George, Mapes, Michael, Marusic, Al, Meng, Wuzheng, Mernick, Kevin, Michnoff, Robert, Mihara, Kentaro, Miller, Toby, Minty, Michiko, Narayan, Geetha, Orfin, Paul, Petrushina, Irina, Phillips, David, Pinayev, Igor, Rao, Triveni, Ravikumar, Dhananjay, Reich, Jonathan, Robert-Demolaize, Guillaume, Roser, Thomas, Seberg, Scott, Severino, Freddy, Sheehy, Brian, Shih, Kai, Skaritka, John, Smart, Loralie, Smith, Kevin, Snydstrup, Louis, Soria, Victor, Than, Roberto, Theisen, Charles, Tuozzolo, Joseph, Walsh, John, Wang, Erdong, Wang, Gang, Weiss, Daniel, Xiao, Binping, Xin, Tianmu, Xu, Wencan, Zaltsman, Alex, and Zhao, Zhi

Subjects
New Lasing & Status of Projects, Physics::Accelerator Physics, Accelerator Physics
Abstract

In this talk we are presenting the most recent results from the commissioning of unique Coherent Electron Cooling system, which is using an FEL amplifier to facilitate cooling of hadrons by an electron beam. We present achieved results as well as changes we encountered in the process., Proceedings of the 38th Int. Free Electron Laser Conf., FEL2017, Santa Fe, NM, USA

Published
2018
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4. Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL

Author

Pinayev, Igor, Altinbas, Zeynep, Anderson, Richard, Belomestnykh, Sergey, Boulware, Charles, Brown, Kevin, Brutus, Jean Clifford, Curcio, Anthony, Di Lieto, Anthony, Folz, Charles, Gassner, David, Grimm, Terry, Hayes, Thomas, Hulsart, Robert, Inacker, Patrick, Jamilkowski, James, Jing, Yichao, Kayran, Dmitry, Kellermann, Robert, Lambiase, Robert, Litvinenko, Vladimir, Ma, Jun, Mahler, George, Mapes, Michael, Marusic, Al, Meng, Wuzheng, Mernick, Kevin, Michnoff, Robert, Mihara, Kentaro, Miller, Toby, Minty, Michiko, Narayan, Geetha, Orfin, Paul, Petrushina, Irina, Phillips, David, Rao, Triveni, Ravikumar, Dhananjay, Reich, Jonathan, Robert-Demolaize, Guillaume, Roser, Thomas, Seberg, Scott, Severino, Freddy, Sheehy, Brian, Shih, Kai, Skaritka, John, Smart, Loralie, Smith, Kevin, Snydstrup, Louis, Soria, Victor, Than, Roberto, Theisen, Charles, Tuozzolo, Joseph, Walsh, John, Wang, Erdong, Wang, Gang, Weiss, Daniel, Xiao, Binping, Xin, Tianmu, Xu, Wencan, Zaltsman, Alex, and Zhao, Zhi

Subjects
Physics::Accelerator Physics, Accelerator Physics, Status Reports
Abstract

The coherent electron cooling proof-of-principle experiment is aimed to demonstrate new technique suitable for cooling of the high energy protons and is essential for a future electron-hadron collider. In this paper we present the current status of the equipment, achieved beam parameters, and progress of the experiment. Future plans are also discussed., Proceedings of the 11th Workshop on Beam Cooling and Related Topics, COOL2017, Bonn, Germany

Published
2018
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5. Commissioning of CeC PoP Accelerator

Author

Pinayev, Igor, Altinbas, Zeynep, Brutus, Jean Clifford, Curcio, Anthony, Di Lieto, Anthony, Folz, Charles, Fu, Wenge, Gassner, David, Hao, Yue, Harvey, Margaret, Hayes, Thomas, Hulsart, Robert, Jamilkowski, James, Jing, Yichao, Kankiya, Prerana, Kayran, Dmitry, Kellermann, Robert, Litvinenko, Vladimir, Mahler, George, Mapes, Michael, Mernick, Kevin, Michnoff, Robert, Mihara, Kentaro, Miller, Toby, Narayan, Geetha, Orfin, Paul, Paniccia, Matthew, Petrushina, Irina, Phillips, David, Rao, Triveni, Severino, Freddy, Sheehy, Brian, Skaritka, John, Smart, Loralie, Smith, Kevin, Soria, Victor, Sorrell, Zachary, Than, Roberto, Tuozzolo, Joseph, Wang, Erdong, Wang, Gang, Xiao, Binping, Xu, Wencan, Zaltsman, Alex, and Zhao, Zhi

Subjects
Physics::Accelerator Physics, 2: Photon Sources and Electron Accelerators, Accelerator Physics
Abstract

Coherent electron cooling is new cooling technique to be tested at BNL. Presently we are in the commissioning stage of the accelerator system. In this paper we present status of various systems and achieved beam parameters as well as operational experience. Near term future plans are also discussed., Proceedings of the North American Particle Accelerator Conf., NAPAC2016, Chicago, IL, USA

Published
2017
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6. First Results of the SRF Gun Test for CeC PoP Experiment

Author

Pinayev, Igor, Altinbas, Zeynep, Belomestnykh, Sergey, Brown, Kevin, Brutus, Jean Clifford, Curcio, Anthony, Di Lieto, Anthony, Folz, Charles, Gassner, David, Harvey, Margaret, Jamilkowski, James, Jing, Yichao, Kayran, Dmitry, Kellermann, Robert, Lambiase, Robert, Litvinenko, Vladimir, Mahler, George, Mapes, Michael, Meng, Wuzheng, Miller, Toby, Minty, Michiko, Narayan, Geetha, Orfin, Paul, Rao, Triveni, Reich, Jonathan, Sheehy, Brian, Skaritka, John, Smart, Loralie, Smith, Kevin, Snydstrup, Louis, Soria, Victor, Than, Roberto, Theisen, Charles, Tuozzolo, Joseph, Wang, Erdong, Wang, Gang, Xiao, Binping, Xin, Tianmu, Xu, Wencan, and Zaltsman, Alex

Subjects
Physics::Accelerator Physics, FEL Technology and HW: Electron Diagnostics, Timing, Synchronization, and Controls, Accelerator Physics
Abstract

We have started the first tests of the equipment for the coherent electron cooling proof-of-principle experiment. After tests of the 500 MHz normal conducting cavities we proceeded with the low power beam tests of a CW SRF gun. The results of the tests with record beam parameters are presented., Proceedings of the 37th International Free Electron Laser Conference, FEL2015, Daejeon, Republic of Korea

Published
2015
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7. Commissioning of the 112 MHz SRF Gun

Author

Belomestnykh, Sergey, Ben-Zvi, Ilan, Brutus, Jean Clifford, Hayes, Thomas, Litvinenko, Vladimir, Mernick, Kevin, Narayan, Geetha, Orfin, Paul, Pinayev, Igor, Rao, Triveni, Severino, Freddy, Skaritka, John, Smith, Kevin, Than, Roberto, Tuozzolo, Joseph, Wang, Erdong, Wu, Qiong, Xiao, Binping, Xin, Tianmu, and Zaltsman, Alex

Subjects
SRF Technology - Cavity, Accelerator Physics
Abstract

A 112 MHz superconducting RF photoemission gun was designed, fabricated and installed in RHIC for the Coherent electron Cooling Proof-of-Principle (CeC PoP) experiment at BNL. The gun was commissioned first without beam. This was followed by generating the first photoemission beam from a multi-alkali cathode. The paper presents the commissioning results., Proceedings of the 17th International Conference on RF Superconductivity, SRF2015, Whistler, BC, Canada

Published
2015
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8. The First Operation of 56 MHz SRF Cavity in RHIC

Author

Wu, Qiong, Belomestnykh, Sergey, Ben-Zvi, Ilan, Blaskiewicz, Michael, DeSanto, Leonard, Goldberg, Darryl, Harvey, Margaret, Hayes, Thomas, McIntyre, Gary, Mernick, Kevin, Orfin, Paul, Seberg, Scott, Severino, Freddy, Smith, Kevin, Than, Roberto, and Zaltsman, Alex

Subjects
4: Hadron Accelerators, Physics::Optics, Physics::Accelerator Physics, Accelerator Physics
Abstract

A 56 MHz superconducting RF cavity has been designed, fabricated and installed in the Relativistic Heavy Ion Collider (RHIC). The cavity operated at 4.4 K with a “quiet helium source” to isolate the cavity from environmental acoustic noise. The cavity is a beam driven quarter wave resonator. It is detuned and damped during injection and acceleration cycles and is brought to operation only at store energy. For a first test operation, the cavity voltage was stabilized at 300 kV with full beam current. Within both Au + Au and asymmetrical Au + He3 collisions, luminosity improvement was detected from direct measurement, and the hourglass effect was reduced. One higher order mode (HOM) coupler was installed on the cavity. We report in this paper on our measurement of a broadband HOM spectrum excited by the Au beam., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA

Published
2015
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9. Commissioning of the 112 MHz SRF Gun and 500 MHz Bunching Cavities for the CeC PoP Linac

Author

Belomestnykh, Sergey, Ben-Zvi, Ilan, Brutus, Jean Clifford, Litvinenko, Vladimir, McIntosh, Peter, Moss, Andrew, Narayan, Geetha, Orfin, Paul, Pinayev, Igor, Rao, Triveni, Skaritka, John, Smith, Kevin, Than, Roberto, Tuozzolo, Joseph, Wang, Erdong, Wheelhouse, Alan, Wu, Qiong, Xiao, Binping, Xin, Tianmu, Xu, Wencan, and Zaltsman, Alex

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, 7: Accelerator Technology, Accelerator Physics
Abstract

The Coherent electron Cooling Proof-of-Principle (CeC PoP) experiment at BNL includes a short electron linac. During Phase I a 112 MHz superconducting RF photoemission gun and two 500 MHz normal conducting bunching cavities were installed and commissioned. The paper describes the Phase I linac layout and presents commissioning results for the cavities and associated RF, cryogenic and other sub-systems., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA

Published
2015
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11. Cryogenic Systems for Proof of the Principle Experiment of Coherent Electron Cooling at RHIC.

Author

Yuenian Huang, Belomestnykh, Sergey, Brutus, Jean Clifford, Lederle, Dewey, Orfin, Paul, Skaritka, John, Soria, Victor, Tallerico, Thomas, and Than, Roberto

Subjects
CRYOGENICS, ELECTRON beams, COLLIDERS (Nuclear physics), COOLING, PROTON beams, ION beams, SUPERCONDUCTIVITY, RADIO frequency
Abstract

The Coherent electron Cooling (CeC) Proof of Principle (PoP) experiment is proposed to be installed in the Relativistic Heavy Ion Collider (RHIC) to demonstrate proton and ion beam cooling with this new technique that may increase the beam luminosity in certain cases, by as much as tenfold. Within the scope of this project, a 112 MHz, 2MeV Superconducting Radio Frequency (SRF) electron gun and a 704 MHz 20MeV 5-cell SRF cavity will be installed at IP2 in the RHIC ring. The superconducting RF electron gun will be cooled in a liquid helium bath at 4.4 K. The 704 MHz 5- cell SRF cavity will be cooled in a super-fluid helium bath at 2.0 K. This paper discusses the cryogenic systems designed for both cavities. For the 112 MHz cavity cryogenic system, a condenser/boiler heat exchanger is used to isolate the cavity helium bath from pressure pulses and microphonics noise sources. For the 704 MHz 5-cell SRF cavity, a heat exchanger is also used to isolate the SRF cavity helium bath from noise sources in the sub-atmospheric pumping system operating at room temperature. Detailed designs, thermal analyses and discussions for both systems will be presented in this paper. [ABSTRACT FROM AUTHOR]

Published
2014
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12. Record performance of SRF gun with CsK2Sb photocathode

Author

Pinayev, Igor, Altinbas, Zeynep, Belomestnykh, Sergey, Ben-Zvi, Ilan, Brown, Kevin, Brutus, Jean Clifford, Curcio, Anthony, Di Lieto, Anthony, Folz, Charles, Gassner, David, Harvey, Margaret, Hayes, Thomas, Hulsart, Robert, Jamilkowski, James, Jing, Yichao, Kayran, Dmitry, Kellermann, Robert, Lambiase, Robert, Litvinenko, Vladimir, Mahler, George, Mapes, Michael, Meng, Wuzheng, Mernick, Kevin, Michnoff, Robert, Miller, Toby, Minty, Michiko, Narayan, Geetha, Orfin, Paul, Phillips, David, Rao, Triveni, Reich, Jonathan, Roser, Thomas, Sheehy, Brian, Skaritka, John, Smart, Loralie, Smith, Kevin, Snydstrup, Louis, Soria, Victor, Sorrell, Zachary, Than, Roberto, Theisen, Charles, Tuozzolo, Joseph, Wang, Erdong, Wang, Gang, Xiao, Binping, Xin, Tianmu, Xu, Wencan, Zaltsman, Alex, and Zhao, Zhi

Subjects
Physics::Accelerator Physics, 03 Alternative Particle Sources and Acceleration Techniques, Accelerator Physics
Abstract

High-gradient CW photo-injectors operating at high ac-celerating gradients promise to revolutionize many sci-ences and applications. They can establish the basis for super-bright monochromatic X-ray and gamma-ray sources, high luminosity hadron colliders, nuclear- waste transmutation or a new generation of microchip produc-tion. In this paper we report on our operation of a super-conducting RF electron gun with a record-high accelerat-ing gradient at the CsK2Sb photocathode (i.e. ~ 20 MV/m) generating a record-high bunch charge (i.e., 2 nC). We briefly describe the system and then detail our experimental results., Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea

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