vacuum characteristics of the dtl and sdtl cavities …
TRANSCRIPT
Proceedings of the4th Annual Meeting of Particle Accelerator Society of Japan and the 32nd Linear Accelerator Meeting in Japan (August 1-3, 2007, Wako Japan)
VACUUM CHARACTERISTICS OF THE DTL AND SDTL CAVITIES FORJ-PARC EXCITED WITH HIGH-POWER RF
Hiroyuki AsanoA), Shozo AnamiB), Takashi ItouA), Masato KawamuraB), Chikashi KubotaB), Tetsuya KobayashiA),Hiroyuki SuzukiA), Hirokazu TanakaB), Etsuji ChishiroA), Fujio Naito1,B), Kesao NanmoB), Zhigao FangB),
Yuji FukuiB), Toshihiko HoriA), Masayoshi YamazakiA), Seiya YamaguchiB),A) Japan Atomic Energy Agency (JAEA)
2-4 Shirane, Shirakata, Tokai-mura, Ibaraki, 319-1195B) High Energy Accelerator Research Organization (KEK)
1-1 Oho, Tsukuba-shi, Ibaraki, 305-0801
Abstract
The main component of the linac of J-PARC consists of three DTL and 32 SDTL cavities. Therefore the stability ofthe linac system strongly depends on the property of the cavities. As far as we know, the vacuum level of the tank isone of a good measure of the cavity condition. Since the variation of the cavity vacuum level is caused by thecavity structure and also the RF power level supplied to the cavity, we have measured the power dependence of thevacuum level of the cavity systematically after the basic conditioning for the cavities.
J-PARC DTL SDTL
1 E-mail: [email protected]
SDTL
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Proceedings of the4th Annual Meeting of Particle Accelerator Society of Japan and the 32nd Linear Accelerator Meeting in Japan (August 1-3, 2007, Wako Japan)
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< 50kW 200 800kW
3.1 DTL
4 DTLD1 0.1MW 0.8~1.1MW
D2 0.1MW0.7~0.9MW D1
D30.4~0.6MW
D1=0.9MW, D2=1.1MW, D3=1.0MW
4DTL E0=2 2.5MV/m
E0=0.5MV//m
[2]E0 0.5MV/m E0
2.0MV/m
SDTL1 2
DTL
DTL
DTL-1
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Proceedings of the4th Annual Meeting of Particle Accelerator Society of Japan and the 32nd Linear Accelerator Meeting in Japan (August 1-3, 2007, Wako Japan)
3.2 SDTL
33.5MV/m
DTL
DTL SDTLDTL
SDTL
SDTL
152mm66mm 43mm
V P P[w]=V2/Z (Z=50)
P=110 500kW
SDTL 100 200kW
3 3.5MV/mDTL
J PARC DTLSDTL
DTL 2.0 2.5MV/m
SDTL2
DTL
[1] Y. Yamazaki, “STATUS OF THE J-PARC LINAC,INITIAL RESULTS AND UPGRADE PLAN”, Proc. ofLINAC 2004, Lübeck, Germany (2004) 554
[2] Albert J. Hatch and H. Bartel Williams, “MulipactingModes of High-Frequency Gaseous Breakdown”, Phys.Rev. Vol. 112 (1958) 681.
SDTL
SDTL
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