DocumentCode
861004
Title
First Results on a 500 MHz Superconducting Test Cavity for TRISTAN
Author
Furuya, T. ; Hiramatsu, S. ; Nakazato, T. ; Kato, T. ; Kneisel, P. ; Kojima, Y. ; Takagi, T.
Author_Institution
National Laboratory for High Energy Physics Oho-machi, Tsukuba-gun, Ibaraki-ken, 305, Japan
Volume
28
Issue
3
fYear
1981
fDate
6/1/1981 12:00:00 AM
Firstpage
3225
Lastpage
3227
Abstract
First results on measurements of a 500 MHz superconducting cavity for TRISTAN are reported. The cavity of spherical shape has been built from 2.5 mm niobium sheet of 99.6 % purity by spinning, the main impurity being 1700 ppm of tantalum. Electropolishing and oxipolishing techniques have been applied for surface treatment. No high temperature degassing has been carried out. A Q-value of Qo = 3.4 × 109 and an accelerating gradient of Eacc = 4.1 MV/m have been obtained at 4.2 K. At 1.9 K the Q-value has been improved to 1.1 x 1010. Gas condensation and degassing effects on the cavity are also reported.
Keywords
Acceleration; Electrons; Fabrication; High temperature superconductors; Impurities; Niobium; Spinning; Surface treatment; Testing; Welding;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/TNS.1981.4332059
Filename
4332059
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