Operational experience of a 500 kV photoemission gun

Nishimori, N.; Nagai, Ryoji; Hajima, Ryoichi; Yamamoto, Masahiro; Honda, Y.; Miyajima, Tsukasa; Uchiyama, Takashi

doi:10.1103/physrevaccelbeams.22.053402

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…[17] which demonstrated a world record 65 mA average current employing a vertically mounted cylindrical insulator, thus allowing the use of a loadlock system to exchange photocathodes. A copy of the Cornell photogun is in operation at Brookhaven National Laboratory and routinely delivers tens of milliamperes average current for the LEReC experiment [7], while a similar photogun design at KEK in Japan has recently demonstrated sustained ∼1 mA cw electron beam from GaAs photocathodes biased at −500 kV [18].…”

Section: Introductionmentioning

confidence: 99%

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Hernandez‐Garcia

Adderley

Bullard

et al. 2019

Phys. Rev. Accel. Beams

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This contribution describes the latest milestones of a multiyear program to build and operate a compact −300 kV dc high voltage photogun with inverted insulator geometry and alkali-antimonide photocathodes. Photocathode thermal emittance measurements and quantum efficiency charge lifetime measurements at average current up to 4.5 mA are presented, as well as an innovative implementation of ion generation and tracking simulations to explain the benefits of a biased anode to repel beam line ions from the anodecathode gap, to dramatically improve the operating lifetime of the photogun and eliminate the occurrence of micro-arc discharges.

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Section: Introductionmentioning

confidence: 99%

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Hernandez‐Garcia

Adderley

Bullard

et al. 2019

Phys. Rev. Accel. Beams

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“…Figure 3 shows the overall conditioning time along with the current, vacuum, and averaged radiation levels in the gun. Our total high voltage conditioning duration is much shorter than other comparable HVDC guns, indicating our new post treatment and clean processing might have played an important role [16,26,27].…”

Section: High Voltage Performancementioning

confidence: 85%

High voltage DC gun for high intensity polarized electron source

Wang,

Rahman,

Skaritka

et al. 2021

Preprint

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The high intensity polarized electron source is a critical component for future nuclear physics facilities. The Electron Ion Collider (EIC) requires a polarized electron gun with higher voltage and higher bunch charge compared to any existing polarized electron source. At Brookhaven National Laboratory, we have built an inverted high voltage direct current (HVDC) photoemission gun with a large cathode size. We report on the performances of GaAs photocathodes in a high gradient with up to a 16 nC bunch charge. The measurements were performed at a stable operating gap voltage of 300 kV -demonstrating outstanding lifetime, and robustness. We observed obvious lifetime enhancement by biasing the anode. The gun also integrated a cathode cooling system for potential application on high current electron sources. The various novel features implemented and demonstrated in this polarized HVDC gun open the door towards future high intensity-high average current electron accelerator facilities.

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“…The injector consists of a 550 kV DC gun 27 , a buncher, two solenoids and a cryomodule with 8 2-cell cavities. A 20 ps drive laser is used to generate the electron beam in the DC gun and then the electron beam is sent into the buncher to be compressed to about 4 ps (FWHM).…”

Section: An Euv Light Source Based On Erl With the Adm Schemementioning

confidence: 99%

Energy recovery linac based fully coherent light source

Zhao

Wang

Feng

et al. 2021

Sci Rep

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Energy recovery linac (ERL) holds great promise for generating high repetition-rate and high brightness electron beams. The application of ERL to drive a free-electron laser is currently limited by its low peak current. In this paper, we consider the combination of ERL with the recently proposed angular-dispersion induced microbunching technique to generate fully coherent radiation pulses with high average brightness and tunable pulse length. Start-to-end simulations have been performed based on a low energy ERL (600 MeV) for generating coherent EUV radiation pulses. The results indicate an average brightness over 1025 phs/s/mm2/mrad2/0.1%BW and average power of about 100 W at 13.5 nm or 20 W with the spectral resolution of about 0.5 meV with the proposed technique. Further extension of the proposed scheme to shorter wavelength based on an ERL complex is also discussed.

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Operational experience of a 500 kV photoemission gun

Cited by 15 publications

References 21 publications

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

High voltage DC gun for high intensity polarized electron source

Energy recovery linac based fully coherent light source

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