Title:
APPARATUS FOR MONITORING ELECTROMAGNETIC WAVE OUTPUT
Document Type and Number:
Japanese Patent JPH1183919
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To enable monitoring of electromagnetic waves while bringing the waves into plasma, by reflecting entering electromagnetic wave beams with the use of a plurality of mirrors, separating the beams to a primary beam and a secondary beam, and measuring an output of the secondary beam. SOLUTION: An electromagnetic wave output-monitoring apparatus 100 set, e.g. in a transmission path where outputs of a gyrotron are guided to a nuclear fusion reactor includes a mirror optical system comprising two phase correction mirrors 102a, 102b of a predetermined shape set in a space surrounded by a vacuum wall 104 and an electric power-measuring apparatus 103. Millimetric wave beams set, for example, in an He11 mode from the gyrotron are input to an entrance part 111 via a corrugate waveguide 101a and separated by the phase correction mirrors 102a, 102b to, for instance, a primary beam 120 of the He11 mode having approximately 99% power and a secondary beam 122 of a Gaussian distribution type having approximately 1%, power. An electric power of the secondary beam 122 is measured by the measuring apparatus 103, whereby an electric power of the primary beam 120 can be detected from a preliminarily obtained power ratio.
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Inventors:
HIRATA YOSUKE
HAYASHI KENICHI
HAYASHI KENICHI
Application Number:
JP24912797A
Publication Date:
March 26, 1999
Filing Date:
September 12, 1997
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G01R29/08; G21B1/00; H01Q15/16; (IPC1-7): G01R29/08; G21B1/00; H01Q15/16
Attorney, Agent or Firm:
Kazuo Sato (3 others)