Improved system for perpendicular electron-cyclotron emission measurements on TMX-Upgrade

Conference · Fri Mar 07 04:00:00 EST 1986

OSTI ID:6088252

Lasnier, C J; Ellis, R F; James, R A

Perpendicular electron-cyclotron emission (PECE) is used on TMX-U to diagnose thermal-barrier hot electrons (T/sub H/ approx. 100 to 400 keV); yielding the time history of the temperature of these relativistic electrons. We describe an improved quasi-optical viewing system for these measurements that uses high sensitivity superheterodyne receivers at fixed frequencies of 60, 98, 130, and 196 GHz. The improved viewing and transport system consists of an off-axis ellipsoidal mirror that images the plasma onto a V-band conical collection horn, an overmoded circular waveguide (7/8'' diam) that transports the radiation outside the vacuum vessel where the polarization is selected, and a high absorptivity Macor beam dump to prevent internal wall reflections from entering the viewing system. A relativistic code is used to calculate optically thin PECE signals from relativistic electrons for various energy and pitch angle distributions. 4 refs., 4 figs.

• Research Organization: Maryland Univ., College Park (USA); Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6088252
• Report Number(s): UCRL-93883; CONF-860324-8; ON: DE86008022
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CYCLOTRON RESONANCE
ELECTRON CYCLOTRON-RESONANCE
ELECTRON TEMPERATURE
EMISSION SPECTRA
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA
PLASMA DIAGNOSTICS
RELATIVISTIC PLASMA
RESONANCE
SPECTRA
TANDEM MIRRORS
THERMONUCLEAR DEVICES
TMX DEVICES