Q-band AM Reflectometer on the DIII-D 285$^{\circ}$-300$^{\circ}$ Fast Wave Antenna

POSTER

Abstract

A Q-band AM reflectometer has been re-installed onto the 285$^{\circ}$-300$^{\circ}$ fast wave antenna on DIII-D to measure the local density profile in the scrape-off layer (SOL) at the ICRF antenna. This reflectometer sweeps from 32-54~GHz in 100~microseconds and uses 100~MHz amplitude modulation to allow differential-phase measurements. Initial results during RF operation will be presented, including results during gas puffing at the fast wave antenna to increase antenna loading.

*Work supported by the US DOE DE-AC05-00OR22725, DE-AC02-09CH11466, and DE-FC02-04ER54698.

Authors

  • G.R. Hanson

    • Oakridge National Laboratory

  • N. Commaux

    • Oak Ridge National Laboratory

  • F.W. Baity

  • A.R. Horton

  • J.B. Wilgen

    • Oak Ridge National Laboratory

  • A. Nagy

    • Princeton Plasma Physics Laboratory

  • R.I. Pinsker

    • General Atomics
    • Whitworth University
    • Mesa State College
    • Cornell University
    • Clemson U.
    • SE Missouri State U.