Increasing charge lifetime in DC polarized electron guns by offsetting the anode

Abstract

Charge lifetime of strained superlattice GaAs photocathodes in DC guns is limited by ion back bombardment. It needs to be improved at least an order of magnitude to meet the requirements for future colliders such as Electron-Ion Collider (EIC). In this work, we propose and present simulation results for an offset anode scheme to increase charge lifetime in DC guns. This scheme eliminates the bombardment of high energy ions on the cathode and enables maximum usage of the available cathode area. Depending on the size of the available cathode area, this method can increase the charge lifetime by an order of magnitude compared to the current best alternative method. An anode assembly capable of in-vacuum movement is required for this method, which has been designed and fabricated at Brookhaven National Laboratory.

arXiv comment16 pages, 10 figures

References in corpus (5)

• Production of highly-polarized positrons using polarized electrons at MeV energies
• The Large Hadron Electron Collider
• Comparison of DC and SRF Photoemission Guns For High Brightness High Average Current Beam Production
• Fluctuations Do Matter: Large Noise-Enhanced Halos in Charged-Particle Beams
• The SLAC Polarized Electron Source

Cited by in corpus (2)

• Improved lifetime of a high spin polarization superlattice photocathode
• High voltage DC gun for high intensity polarized electron source