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Title: Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype

Abstract

The 703 MHz superconducting gun for BNL ERL prototype was tested at JLab with and without choke-joint and cathode stalk. Without choke-joint and cathode stalk, the gradient reached was 25 MV/m with Q{sup 0} {approx} 6E9. The gun cathode insertion port is equipped with a grooved choke joint for multipacting suppression. We carried out tests with choke-joint and cathode stalk. The test results show that there are at least two barriers at about 3.5 MV/m and 5 MV/m. We considered several possibilities and finally found that fine details of the grooved shape are important for multipacting suppression. A triangular groove with round crest may cause strong multipacting in the choke-joint at 3.5 MV/m, 5 MV/m and 10 MV/m. This paper presents the primary test results of the gun and discusses the multipacting analysis in the choke-joint. It also suggests possible solutions for the gun and multipacting suppressing for a similar structure.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1020922
Report Number(s):
BNL-94099-2011-CP
R&D Project: KBCH139; 18054; KB0202011; TRN: US1103895
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; BNL; CATHODES; SHAPE; relativistic heavy ion collider

Citation Formats

Xu, W, Ben-Zvi, I, Belomestnykh, S, Burrill, A, Holmes, D, Kayran, D, McIntyre, G, and Sheehy, B. Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype. United States: N. p., 2011. Web.
Xu, W, Ben-Zvi, I, Belomestnykh, S, Burrill, A, Holmes, D, Kayran, D, McIntyre, G, & Sheehy, B. Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype. United States.
Xu, W, Ben-Zvi, I, Belomestnykh, S, Burrill, A, Holmes, D, Kayran, D, McIntyre, G, and Sheehy, B. 2011. "Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype". United States. https://www.osti.gov/servlets/purl/1020922.
@article{osti_1020922,
title = {Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype},
author = {Xu, W and Ben-Zvi, I and Belomestnykh, S and Burrill, A and Holmes, D and Kayran, D and McIntyre, G and Sheehy, B},
abstractNote = {The 703 MHz superconducting gun for BNL ERL prototype was tested at JLab with and without choke-joint and cathode stalk. Without choke-joint and cathode stalk, the gradient reached was 25 MV/m with Q{sup 0} {approx} 6E9. The gun cathode insertion port is equipped with a grooved choke joint for multipacting suppression. We carried out tests with choke-joint and cathode stalk. The test results show that there are at least two barriers at about 3.5 MV/m and 5 MV/m. We considered several possibilities and finally found that fine details of the grooved shape are important for multipacting suppression. A triangular groove with round crest may cause strong multipacting in the choke-joint at 3.5 MV/m, 5 MV/m and 10 MV/m. This paper presents the primary test results of the gun and discusses the multipacting analysis in the choke-joint. It also suggests possible solutions for the gun and multipacting suppressing for a similar structure.},
doi = {},
url = {https://www.osti.gov/biblio/1020922}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 28 00:00:00 EDT 2011},
month = {Mon Mar 28 00:00:00 EDT 2011}
}

Conference:
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