A 500 KV INVERTED GEOEMTRY FEEDTHROUGH FOR A HIGH VOLT-AGE DC ELECTRON GUN

Conference · Sat Oct 01 00:00:00 EDT 2022

DOI:https://doi.org/10.18429/JACoW-NAPAC2022-WEPA16· OSTI ID:1902894

Hernandez-Garcia, C.; Bullard, D. B. ^[1]; Grames, J. M. ^[1]; Palacios Serrano, G. G. ^[1]; Poelker, M. ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The Continuous Electron Beam Accelerator Facility injector at Jefferson Lab (JLab) utilizes an inverted-geometry ceramic insulator photogun operating at 130 kV direct current to generate spin-polarized electron beams for high-energy nuclear physics experiments. A second photogun delivers 180 keV beam for commissioning a SRF booster in a testbed accelerator, and a larger version delivers 300 keV magnetized beam in a test stand beam line. This contribution reports on the development of an unprecedented inverted-insulator with cable connector for reliably applying 500 kV DC to a future polarized beam photogun, to be designed for operating at 350 kV without field emission. Such a photogun design could then be used for generating a polarized electron beam to drive a spin-polarized positron source as a demonstrator for high energy nuclear physics at JLab. There are no commercial cable connectors that fit the large inverted insulators required for that voltage range. Our proposed concept is based on a modified epoxy receptacle with intervening SF6 layer and a test electrode in a vacuum vessel.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1902894
• Report Number(s): JLAB-ACC-22-3681; DOE/OR/23177-5562; LAB 20-2310 award PAMS-254442
• Resource Relation: Conference: NAPAC 2022, Albuquerque, New Mexico, USA, 7-12 August 2022
• Country of Publication: United States
• Language: English