New Digital Control System for the JET Alfv\'{e}n Eigenmode Active Spectroscopy Diagnostic

POSTER

Abstract

The state-of-the-art JET Alfv\'{e}n active spectroscopy diagnostic with eight internal inductive antennas is being upgraded from a single 5 kW tube amplifier to eight parallel, 10 -- 1000 kHz, 4 kW solid state class D power switching amplifiers. A new digital control system has been designed with arbitrary constant phase controlled frequency sweeps for traveling mode studies, amplifier gain control through a feedback loop referenced to programmed antenna current profiles, and integration with CODAS for synchronization, triggering, gating, and fault tripping. A combination of National Instruments Real Time LabView software and FPGA circuits is used to achieve the multiple control requirements with better than 1 ms response. System specifications and digital-analog design trade offs for sweep rates, response times, frequency resolution, and voltage levels will be presented.

*Supported by USDOE, EDFA, Brazil

Authors

  • P.P. Woskov

    • MIT-PSFC
    • PSFC MIT

  • J. Stillerman

    • PSFC MIT

  • Miklos Porkolab

    • Massachusetts Institute of Technology
    • MIT-PSFC
    • MIT PSFC
    • PSFC MIT
    • PSFC, MIT
    • MIT

  • Ambrogio Fasoli

    • EPFL
    • CRPP-EPFL

  • D. Testa

    • Centre de Recherches en Physique des Plasmas, Lausanne, Switzerland
    • CRPP-EPFL

  • R. Galvao

    • IFUSP

  • A. Pires dos Resis

    • IFUSP

  • W. Pires de Sa

    • IFUSP

  • L. Ruchko

    • IFUSP

  • P. Blanchard

    • JET CSU

  • J. Figueiredo

    • JET CSU

  • S. Dorling

    • JET CODAS

  • J. Farthing

    • JET CODAS

  • M. Graham

    • JET JOC

  • S. Dowson

    • JET JOC

  • L. Yu

    • NI

  • S. Concezzi

    • NI