Inverted Geometry Ceramic Insulators in High Voltage DC Electron Guns for Accelerators

Hernandez-Garcia, C.; Palacios-Serrano, G.; Adderley, P.; Bullard, D.; Grames, J.; Mamun, M. A.; Poelker, M.; Stutzman, M.; Suleiman, R.; Wang, Y.; Wijethunga, S. A. K.

doi:10.1109/ceidp50766.2021.9705333

Inverted Geometry Ceramic Insulators in High Voltage DC Electron Guns for Accelerators

Journal Article · Sun Dec 12 00:00:00 EST 2021 · Annual report - Conference on Electrical Insulation and Dielectric Phenomena (Online)

DOI:https://doi.org/10.1109/ceidp50766.2021.9705333· OSTI ID:1885536

Hernandez-Garcia, C. ^[1]; Palacios-Serrano, G. ^[1]; Adderley, P. ^[1]; Bullard, D. ^[1]; Grames, J. ^[1]; Mamun, M. A. ^[1]; Poelker, M. ^[1]; Stutzman, M. ^[1]; Suleiman, R. ^[1]; Wang, Y. ^[1]; Wijethunga, S. A. K. ^[2]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)

A direct current (dc) high voltage photo-emission electron gun operating at 130 kV is utilized at the Jefferson Lab (JLab) Continuous Electron Beam Accelerator Facility to generate spin-polarized electrons for nuclear physics experiments. Over the past decade, JLab has tested and implemented inverted-geometry ceramic insulators in photoguns, connecting the cathode electrode in vacuum to the high voltage power supply using commercial high voltage cables. The results of those tests showed that breakdown voltage was increased using triple-point shielding electrodes and bulk-doped insulators that allow charge drainage. Furthermore, this contribution describes ongoing work to develop a robust insulator- cable connector for reliably applying 500 kV dc to a future polarized beam photogun operating at 350 kV without field emission.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1885536

Alternate ID(s):: OSTI ID: 1973483

Report Number(s):: DOE/OR/23177-5309; JLAB-ACC-21-3490

Journal Information:: Annual report - Conference on Electrical Insulation and Dielectric Phenomena (Online), Journal Name: Annual report - Conference on Electrical Insulation and Dielectric Phenomena (Online) Vol. 2021; ISSN 2576-2397

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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