Stable operation of the DC-SRF photoinjector

Quan, Shengwen; Hao, Jiankui; Lin, Lin; Zhu, Feng; Fang, Wang; Feng, Lixin; Huang, Senlin; Wang, Zhiwen; Wen, Xiaodong; Fan, Peiliang; Xie, Haoling; Liu, Kexin; Chen, Jiaer

doi:10.1016/j.nima.2015.07.025

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…The Cs 2 Te photocathode performed well in the DC-SRF-I photoinjector during the beam experiment [41,49]. During the beam experiments of the DC-SRF-I photoinjector [48,[50][51][52], the QE of Cs 2 Te photocathode was stabilized at 4% (@266 nm) in the photoinjector for months as shown in Figure 2. The electric field on the surface of the cathode is about 5 MV/m and the peak electric field is less than 13 MV/m.…”

Section: Cs 2 Te Photocathodementioning

confidence: 88%

“…The average beam current was 1 mA in the macropulses with a length of 7 ms (duty factor 7%) and can be kept at about 0.5 mA for routine operation. The normalized transverse emittance of the delivered beam is 3.0 mm.mrad [48]. No dark current was observed by measuring with a faraday cup at the exit of the injector when keeping the DC high voltage and RF field on and without drive laser.…”

Section: Cs 2 Te Photocathodementioning

confidence: 97%

“…No other gun test results are published for Cs 2 Te photocathode except PKU [48]. The Cs 2 Te photocathode performed well in the DC-SRF-I photoinjector during the beam experiment [41,49].…”

Section: Cs 2 Te Photocathodementioning

confidence: 99%

“…Figure 2. The QE of the Cs 2 Te photocathode in the PKU DC-SRF-I photoinjector[48]. Reproduced with the permission from reference[48].…”

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confidence: 99%

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Overview of the Semiconductor Photocathode Research in China

Xie

2021

Micromachines

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With the growing demand from scientific projects such as the X-ray free electron laser (XFEL), ultrafast electron diffraction/microscopy (UED/UEM) and electron ion collider (EIC), the semiconductor photocathode, which is a key technique for a high brightness electron source, has been widely studied in China. Several fabrication systems have been designed and constructed in different institutes and the vacuum of most systems is in the low 10−8 Pa level to grow a high QE and long lifetime photocathode. The QE, dark lifetime/bunch lifetime, spectral response and QE map of photocathodes with different kinds of materials, such as bialkali (K2CsSb, K2NaSb, etc.), Cs2Te and GaAs, have been investigated. These photocathodes will be used to deliver electron beams in a high voltage DC gun, a normal conducting RF gun, and an SRF gun. The emission physics of the semiconductor photocathode and intrinsic emittance reduction are also studied.

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Section: Cs 2 Te Photocathodementioning

confidence: 88%

Section: Cs 2 Te Photocathodementioning

confidence: 97%

“…No other gun test results are published for Cs 2 Te photocathode except PKU [48]. The Cs 2 Te photocathode performed well in the DC-SRF-I photoinjector during the beam experiment [41,49].…”

Section: Cs 2 Te Photocathodementioning

confidence: 99%

“…Figure 2. The QE of the Cs 2 Te photocathode in the PKU DC-SRF-I photoinjector[48]. Reproduced with the permission from reference[48].…”

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confidence: 99%

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Overview of the Semiconductor Photocathode Research in China

Xie

2021

Micromachines

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“…The performance of the K-Cs-Sb photocathode at cryogenic temperature was tested with the DC-SRF photoinjector proposed and developed at Peking University [29]. With the improvements in using K-Cs-Sb photocathode instead of Cs 2 Te and drive laser of truncated Gaussian distribution in the transverse direction and a flat-topped distribution in the longitudinal direction, replacing the original 3.5-cell SRF cavity with a new 1.5-cell cavity, careful design of DC high voltage electrode structure and beam dynamics, the emittance of electron beams from DC-SRF photoinjector has been decreased obviously.…”

Section: Performance Of a Bialkali Photocathode At Cryogenic Temperaturementioning

confidence: 99%

QE evolution of bialkali photocathode at cryogenic temperature

et al. 2023

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Photocathode plays an important role in generating high brightness and low emittance electron beam and K-Cs-Sb photocathode is preferred in SRF injectors for its high quantum efficiency, long lifetime, and low thermal emittance. To predict the QE change of K-Cs-Sb at cryogenic temperature more correctly, we have modified the QE formula of Spicer’s photoemission model considering the temperature dependence of work function and mean free path of photocathode material, which is obtained by fitting experimental data. The calculated QE drop of about 90.1% at 36.4 K fits well with the measured QE change in DC-SRF photoinjector at Peking University. This improved formula could provide a method to evaluate the QE performance of semiconductor photocathodes at cryogenic temperature.

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