LARGE INFRARED LIGHT INTERFEROMETER FOR JET
The 10-channel interferometer under construction for JET is described. The 195 mum wavelength radiation of the DCN laser is used for probing the plasma. The need for a highly reliable system is emphasized and consequences for its design are given. A general layout of the system is presented and specific requirements are discussed, e.g., radiation shielding of the lasers and detectors, remote control and remote handling for maintenance and repairs during the tritium phase. In particular, the optical elements are adjustable with the help of non-magnetic pneumatic stepping motors, and their alignment is monitored by eye viewing through a telescope. The supporting frame of the interferometer is mechanically independent of JET to reduce vibration effects. However, some mirrors are attached to the machine and a compensating interferometer has to be used. The beam path is placed under dry nitrogen to avoid absorption of the DCN radiation by atmospheric water vapour. The expected main characteristics of the interferometer are given.
Bibliographic Reference: WORKSHOP ON DIAGNOSTICS FOR FUSION REACTOR CONDITIONS, VARENNA, COMO (ITALY), SEPT. 6-17, 1982, PP. 283-293 351 P., 1983, ISBN 0-08-031161-X WRITE TO PERGAMON PRESS LTD., HEADINGTON HILL HALL, OXFORD OX3 OBW (ENGLAND), PRICE: UKL 47, (EUR 8351 EN).
Record Number: 1989123109100 / Last updated on: 1987-01-01
Available languages: en