MTX (Microwave Tokamak Experiment) diagnostics and timing system for FEL (free electron laser) heating experiments

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6845681

Casper, T; Allen, S; Foote, J; Fenstermacher, M; Hooper, E; Lasnier, C; Meyer, W; Moller, J; Nilson, D; Rice, B; Sewall, N; Stallard, B; Stever, R; Thomassen, K; Wood, R ^[1]; Hoshino, K; Oasa, K; Ogawa, T ^[2]; Makowski, M ^[3]

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1. Lawrence Livermore National Lab., CA (USA)
2. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan)
3. TRW, Inc., Redondo Beach, CA (USA)

In the MTX program, we are concentrating on experiments using intense, FEL-generated microwave pulses. In initial FEL experiments, several diagnostic instruments were operated during injection of microwave pulses with peak powers to 0.2 GW at durations of 10 nsec. Fixed and spatially scanning microwave detectors and receivers and a 48-element calorimeter on the inside wall of MTX diagnosed the GW-level FEL microwave pulses to study linear wave absorption and to determine efficiencies of transmission through the quasi-optical transport system. In addition, several radially resolved measurements of plasma density, temperature, and emission were made during FEL injection and used in the analysis of microwave absorption data. A timing system, slaved to the FEL pulse arrival time is capable of accuracy to a few nanoseconds in order to allow measurement of heating effects on the time scale of a single FEL pulse. We will discuss operation of these diagnostics and our plans for future measurements of single pulse and high average power heating experiments. 6 refs., 5 figs.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6845681
• Report Number(s): UCRL-JC-103314-Rev.1; CONF-900557-11; ON: DE90013067
• Resource Relation: Conference: 8. topical conference on high-temperature plasma diagnostics, Hyannis, MA (USA), 6-10 May 1990
• Country of Publication: United States
• Language: English

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