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}
}