High-power RF tests on X-band dielectric-loaded, accelerating structures

被引:36
|
作者
Jing, CG [1 ]
Gai, W
Power, JG
Konecny, R
Gold, SH
Liu, W
Kinkead, AK
机构
[1] Argonne Natl Lab, High Energy Phys Div, Chicago, IL 60616 USA
[2] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA
[3] LET Corp, Washington, DC 20007 USA
关键词
dielectric breakdown; dielectric-loaded accelerator; high-power radio frequency; mulit-pactor;
D O I
10.1109/TPS.2005.851957
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A joint Argonne National Laboratory (ANL)/Naval Research Laboratory (NRL) program is under way to investigate X-band dielectric-loaded accelerating (DLA) structures, using high-power 11.424-GHz radiation from the NRL Magnicon Facility. DLA structures offer the potential of a simple, inexpensive alternative to copper disk-loaded structures for use in high-gradient radio-frequency (RF) linear accelerators. A central purpose of our high-power test program is to find the RF breakdown limits of these structures. In this paper, we summarize the most recent tests results for two DLA structures loaded with different ceramics: alumina and MgxCa1-xTiO3 (MCT). No RIP breakdown has been observed up to 5 MW of drive power (equivalent to 8 MV/m accelerating gradient), but multipactor was observed to absorb a large fraction of the incident microwave power. The latest experimental results on suppression of multipactor using a TiN coating on the inner surface of the dielectric are reported. Although we did not observe dielectric breakdown in the structure, breakdown did occur at the ceramic joint, where the electric field is greatly enhanced. Lastly, the MCT structure showed significantly less multipactor for the same level RF field.
引用
收藏
页码:1155 / 1160
页数:6
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