First experience with He conditioning of a superconducting rf photoinjector

Petrushina, Irina; Jing, Yichao; Litvinenko, Vladimir; Ma, Jun; Pinayev, I.; Wang, G.; Kayran, D.; Severino, F.; Narayan, Geetha; Hayes, T.; Brutus, Jean Clifford; Smart, L.; Decker, K.; Belomestnykh, S.

doi:10.1103/physrevaccelbeams.25.092001

Cited by 3 publications

(2 citation statements)

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“…One concern for long-term user facility operation is cavity performance degradation over time, especially due to the cathode exchange. Special care is needed when manipulating the insertion mechanism to correctly install the cathode, as incorrect manipulation could lead to unexpected field emission and new multipacting barriers [35]. Though the He conditioning technique has proven to be an effective method for cavity restoration, the cathode lock and exchange system still poses a potential risk to the facility's operating lifetime.…”

Section: Figurementioning

confidence: 99%

Superconducting radio frequency photoinjectors for CW-XFEL

2023

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A dependable and consistent electron source is a crucial requirement for the achievement of high-power free electron lasers (FELs). Over the past two decades, it has been demonstrated that photoinjectors based on SRF technology (SRF guns) are suitable for continuous wave (CW) beam generation. SRF guns possess both the high accelerating field gradients of normal conducting RF photoinjectors and the low power dissipation thanks to mature SRF cavity technology, and therefore have the potential to provide the high-brightness, high-current beams required for CW-XFELs. After the demonstration of the first SRF gun in Dresden-Rossendorf, several SRF gun programs based on different approaches have achieved promising progress and even succeeded in routine operation. SRF guns are expected to play an important role in XFEL facilities in the near future. In this paper, we give an overview of design concepts, important parameters and development status of the worldwide SRF gun projects.

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Section: Figurementioning

confidence: 99%

Superconducting radio frequency photoinjectors for CW-XFEL

2023

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“…The HZDR 1.3 GHz SRF gun with a Mg photocathode began routine operation in 2017 as part of an accelerator for Tera Hertz (THz) RF production [11]. Cs 2 Te photocathodes were tested in 2020 [28] but strong QE degradation occurred soon after CW RF operation began. Currently, the gun is operating in CW mode with a 14 MV/m of gradient at the photocathode for the user program, and typically produces bunch charges of 200 pC at 50-100 kHz.…”

Section: Superconducting Rf Gunsmentioning

confidence: 99%