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

Pinayev, I.; Litvinenko, V.N.; Tuozzolo, J.; Brutus, Jean Clifford; Belomestnykh, S.; Boulware, Chase H.; Folz, C.; Gassner, D.; Grimm, Terry; Hao, Yue; Jamilkowski, James; Jing, Yichao; Kayran, D.; Mahler, G.; Mapes, M.; Miller, Toby; Narayan, Geetha; Sheehy, B.; Rao, T.; Skaritka, J.; Snydstrup, L.; Than, Y.; Wang, Erdong; Wang, Gang; Xiao, Binping; Xin, Tianmu; Zaltsman, Alexander; Altinbas, Z.; Ben‐Zvi, I.; Curcio, Anthony; Lieto, Anthony Di; Meng, W.; Minty, M.; Orfin, Paul; Reich, Jonathan D.; Roser, T.; Smart, L.; Soria, Víctor; Theisen, C.; Xu, Wei; Wu, Yuqi; Zhao, Zhiye

doi:10.48550/arxiv.1511.05595

Cited by 2 publications

(6 citation statements)

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“…A QE of 0.8% was measured after the cathode stabilized in a preparation chamber. This QE was confirmed during the 112 MHz gun beam test [6].…”

Section: Cathode Preparationsupporting

confidence: 55%

“…Operating at 5 kHz repetition rate, we generated an average beam current of more than 15 µA. More details on the installation and commissioning results along with comprehensive analysis of the gun performance can be found elsewhere [6,11]. After the upgrading the laser system, we expect no problems generating 78 kHz bunches at the same energy and bunch charge as with the temporary laser.…”

Section: Commissioning Resultsmentioning

confidence: 99%

“…QWR guns are especially well suited for generating high-brightness and high-bunch-charge beams as they can operate with high electric field at the cathode with an optimum emission-phase close to 90°, i.e. on the crest; see [6] for more details.…”

Section: Introductionmentioning

confidence: 99%

“…1 shows the layout of the 112 MHz gun, recently installed in the RHIC tunnel and commissioned with a beam, generating 3 nC bunches at 1.7 MeV. The installation and commissioning results, along with a comprehensive analysis of the gun's performance are reported elsewhere [6,11]. This article is devoted to a detailed description of the design of the SRF photoemission source.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of a high-bunch-charge 112-MHz superconducting RF photoemission electron source

Xin

Brutus

Belomestnykh

et al. 2016

Review of Scientific Instruments

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High-bunch-charge photoemission electron-sources operating in a continuous wave (CW) mode are required for many advanced applications of particle accelerators, such as electron coolers for hadron beams, electronion colliders, and free-electron lasers (FELs). Superconducting RF (SRF) has several advantages over other electron-gun technologies in CW mode as it offers higher acceleration rate and potentially can generate higher bunch charges and average beam currents. A 112 MHz SRF electron photoinjector (gun) was developed at Brookhaven National Laboratory (BNL) to produce high-brightness and high-bunch-charge bunches for the Coherent electron Cooling Proof-of-Principle (CeC PoP) experiment. The gun utilizes a quarter-wave resonator (QWR) geometry for assuring beam dynamics, and uses high quantum efficiency (QE) multi-alkali photocathodes for generating electrons.

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“…A QE of 0.8% was measured after the cathode stabilized in a preparation chamber. This QE was confirmed during the 112 MHz gun beam test [6].…”

Section: Cathode Preparationsupporting

confidence: 55%

Section: Commissioning Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of a high-bunch-charge 112-MHz superconducting RF photoemission electron source

Xin

Brutus

Belomestnykh

et al. 2016

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

show abstract

“…Superconducting radio-frequency (SRF) electron guns are frequently considered to be the favorite pathway for generating the high-quality, high-current beams needed for the future high-power energy-recovery linacs. SRF guns can find unique scientific and industrial applications, such as driving high-power X-ray and extreme ultraviolet (EUV) CW free electron lasers (FELs) [1][2][3][4][5][6][7][8][9][10], intense γ-ray sources [11][12][13][14], coolers for hadron beams [15][16][17][18], and electron-hadron colliders [19][20][21]. The quality of the generated electron beam-both its intensity and brightness-is extremely important for many of these applications.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of multipacting in 113 MHz superconducting rf photoinjector

Petrushina

Litvinenko

Pinayev

et al. 2018

Phys. Rev. Accel. Beams

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Superconducting RF (SRF) photo-injectors are one of the most promising devices for generating continuous wave (CW) electron beams with record high brightness. Ultra-high vacuum of SRF guns provides for long lifetime of the high quantum efficiency (QE) photocathodes, while SRF technology provides for high accelerating gradients exceeding 10 MV/m. It is especially true for low frequency SRF guns where electrons are generated at photocathodes at the crest of accelerating voltage. Two main physics challenges of SRF guns are their compatibility with high QE photocathodes and multipacting. The first is related to a possibility of deposition of photocathode materials (such as Cs) on the walls of the SRF cavity, which can result in increased dark current via reduction of the bulk Nb work function and in enhancing of a secondary electron emission yield (SEY). SEY plays critical role in multipacting (e.g. an exponential growth of the multipactor discharge), which could both spoil the gun vacuum and speed up the deposition of the cathode material on the walls of the SRF cavity. In short, the multipactor behavior in superconducting accelerating units must be well understood for successful operation of an SRF photo-injector. In this paper we present our studies of 1.2 MV 113 MHz quarter-wave SRF photo-injector serving as a source of electron beam for the Coherent electron Cooling experiment (CeC) at BNL. During three years of operating our SRF gun we encountered a number of multipacting zones. We also observed that presence of CsK2Sb photocathode in the gun could create additional multipacting barriers. We had conducted a comprehensive numerical and experimental study of the multipactor discharge in our SRF gun. We had developed a process of crossing the multipacting barriers from zero to the operational voltage without affecting the lifetime of our photocathode and enhancing the strength of multipacting barriers. We found a good agreement between the results of simulations and our experimental data.

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

Cited by 2 publications

References 0 publications

Design of a high-bunch-charge 112-MHz superconducting RF photoemission electron source

Design of a high-bunch-charge 112-MHz superconducting RF photoemission electron source

Mitigation of multipacting in 113 MHz superconducting rf photoinjector

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