High voltage performance of a dc photoemission electron gun with centrifugal barrel-polished electrodes

Hernandez-Garcia, C.; Bullard, D.; Hannon, F.; Wang, Y.; Poelker, M.

doi:10.1063/1.4994794

Title: High voltage performance of a dc photoemission electron gun with centrifugal barrel-polished electrodes

Journal Article · Mon Sep 11 00:00:00 EDT 2017 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4994794· OSTI ID:1402449

Hernandez-Garcia, C. ^[1]; Bullard, D. ^[1]; Hannon, F. ^[1]; Wang, Y. ^[1]; Poelker, M. ^[1]

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

The design and fabrication of electrodes for direct current (dc) high voltage photoemission electron guns can significantly influence their performance, most notably in terms of maximum achievable bias voltage. Proper electrostatic design of the triple-point junction shield electrode minimizes the risk of electrical breakdown (arcing) along the insulator-cable plug interface, while the electrode shape is designed to maintain <10 MV/m at the desired operating voltage aiming at little or no field emission once conditioned. Typical electrode surface preparation involves diamond-paste polishing by skilled personnel, requiring several weeks of effort per electrode. In this work, we describe a centrifugal barrel-polishing technique commonly used for polishing the interior surface of superconducting radio frequency cavities but implemented here for the first time to polish electrodes for dc high voltage photoguns. The technique reduced polishing time from weeks to hours while providing surface roughness comparable to that obtained with diamond-paste polishing and with unprecedented consistency between different electrode samples. We present electrode design considerations and high voltage conditioning results to 360 kV (~11 MV/m), comparing barrel-polished electrode performance to that of diamond-paste polished electrodes. Here, tests were performed using a dc high voltage photogun with an inverted-geometry ceramic insulator design.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1402449

Alternate ID(s):: OSTI ID: 1389133

Report Number(s):: JLAB-ACC-17-2527; DOE/OR/23177-4193; RSINAK; R&D Project: 2017-LDRD-2; TRN: US1703239

Journal Information:: Review of Scientific Instruments, Vol. 88, Issue 9; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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A model of gas desorption and radiation during initial high voltage conditioning in vacuum Diamond, William T. Journal of Applied Physics, Vol. 126, Issue 19 https://doi.org/10.1063/1.5124105	journal	November 2019
Compact $- 300 kV$ dc inverted insulator photogun with biased anode and alkali-antimonide photocathode Hernandez-Garcia, C.; Adderley, P.; Bullard, B. Physical Review Accelerators and Beams, Vol. 22, Issue 11 https://doi.org/10.1103/physrevaccelbeams.22.113401	journal	November 2019
Stable operation of a high-voltage high-current dc photoemission gun for the bunched beam electron cooler in RHIC Gu, X.; Altinbas, Z.; Badea, S. Physical Review Accelerators and Beams, Vol. 23, Issue 1 https://doi.org/10.1103/physrevaccelbeams.23.013401	journal	January 2020
Surface Processing and Discharge-Conditioning of High Voltage Electrodes for the Ra EDM Experiment Ready, Roy A.; Arrowsmith-Kron, Gordon; Bailey, Kevin G. arXiv https://doi.org/10.48550/arxiv.2102.11029	text	January 2021

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