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Abstract

A far infrared interferometer for the plasma density measurement on FT Tokamak is described. The probing beam leaving the plasma is mixed with a frequency shifted reference beam: the density evolution is related to the phase change of the detector output signal. The frequency shifted wave is achieved by a rotating grating and the detector is a high sensitivity InSb type, cooled at 4.2 degrees K. The source, a 60 mW molecular HCN laser operating at 337 mum, is highly reliable, and requires little maintenance. Refractive phenomena, combined with windows of limited size and vibration on optical elements, limit the range of measurable density.

Additional information

Authors: GROLLI M ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY), ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY)
Bibliographic Reference: WRITE TO ENEA - CENTRO RICERCHE ENERGIA FRASCATI, SERVIZIO STUDI E DOCUMENTAZIONE, C.P. 65, 00044 FRASCATI, ROMA (ITALY), MENTIONING REPORT 83.15, 1983
Record Number: 1989122043300 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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