Community Research and Development Information Service - CORDIS


These two papers concern the physics and the technical aspects of a high power 140 GHz collective scattering diagnostic to measure fast-ion and alpha particle distributions in JET. Four important effects influence the performance of the diagnostic : refractive index, density fluctuations, emission by the plasma and plasma absorption and re-emission. Illustrative examples of calculated spectra are presented. Technical details of key components of the system are given. These include a high power (400 kW, CW) gyrotron, a high frequency anode modulator, a transmission system, and a heterodyne detection system for analysis of the scattered radiation, as well as in-vessel components to allow a spatial scan. The expected system performance for analysis of fast ion populations is discussed.

Additional information

Authors: COSTLEY A E ET AL, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(89)53 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199010743 / Last updated on: 1994-12-01
Original language: en
Available languages: en