The Design of a High Charge Polarized Preinjector for the Electron-Ion Collider

Wang, Erdong; Grames, Joseph; Guo, Jiquan; Wei, Liang; Ranjbar, Vahid; Skaritka, J.; Tsoupas, N.

doi:10.18429/jacow-ipac2021-tupab037

Cited by 1 publication

(2 citation statements)

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“…The gap distance is determined by the maximum gradient on the electrode which has to be less than 10 MV/m to avoid field emission. The EIC pre-injector baseline design shows that to achieve 7 nC bunch charge from a 300 kV gun with minimum emittance and energy spread, the peak current is 4.5 A, the FWHM bunch length is 1.6 ns, and beam size is 8 mm [2,3]. To get minimal required beam quality before injecting beam into the RCS, the gun operational voltage has to be above 280 kV.…”

Section: Beam Lossmentioning

confidence: 99%

“…The polarized electron source should be able to provide 5.5-7 nC per bunch in a bunch train structure with 8 bunches every second. To achieve the required beam qualities before injecting the beam into the Rapid Cycling Synchrotron (RCS) and minimize beam loss, the gun voltage has to be above 280 kV with beam peak current above 4.5 A according to the current pre-injector design [3].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Beam Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%