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United States Patent | 7,888,937 |
Watanabe , et al. | February 15, 2011 |
A beam current sensor is composed of a cylindrical super-conductive body having a bridge unit formed on the outer diameter side wherein a beam passes through the inner diameter side. The sensor improves efficiency of creating a magnetic field from a current and can measure a beam current as 1 nA. The bridge unit includes a first coil unit formed so as to have an eddy shape wound counterclockwise from the outer diameter side toward the inner diameter side; a second coil unit formed so as to have an eddy shape wound clockwise from the outer diameter side toward the inner diameter side; and a connection portion for connecting the center position of the inner diameter side of the first coil unit with the center position of the inner diameter side of the second coil.
Inventors: | Watanabe; Tamaki (Saitama, JP), Katayama; Takeshi (Tokyo, JP), Kase; Masayuki (Saitama, JP), Ikeda; Tokihiro (Saitama, JP), Watanabe; Shin-ichi (Tokyo, JP), Kawaguchi; Takeo (Akashi, JP), Sasaki; Yu-ichiro (Machida, JP), Mizuno; Bunji (Ikoma, JP), Kanada; Hisataka (Katano, JP) |
Assignee: |
Riken
(Wako-shi, Saitama,
JP)
Panasonic Corporation (Kadoma-shi, Osaka, JP) |
Appl. No.: | 10/573,270 |
Filed: | September 22, 2004 |
PCT Filed: | September 22, 2004 |
PCT No.: | PCT/JP2004/013804 |
371(c)(1),(2),(4) Date: | May 03, 2007 |
PCT Pub. No.: | WO2005/029100 |
PCT Pub. Date: | March 31, 2005 |
Sep 24, 2003 [JP] | 2003-331848 | |||
Current U.S. Class: | 324/318 ; 324/117R; 324/654; 324/76.11 |
Current International Class: | G01R 33/44 (20060101) |
Field of Search: | 324/117R,151A,318,76.11 |
4687987 | August 1987 | Kuchnir et al. |
5270675 | December 1993 | Mori et al. |
63-070089 | May., 1988 | JP | |||
7-135099 | May., 1995 | JP | |||
Kuchnir, M. et al. SQUID Based Beam Current Meter. IEEE Trans. Mag. vol. 21, No. 2, 1985, pp. 997 to 999. cited by other. |
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