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

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138809· OSTI ID:5406065

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

Perpendicular electron-cyclotron emission (PECE) is used on Tandem Mirror Experiment-Upgrade (TMX-U) to diagnose thermal-barrier hot electrons (T-italic/sub H-italic/--100--400 keV, yielding the time history of the temperature of these relativistic electrons. We describe an improved quasioptical 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 in. 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.

• Research Organization: University of Maryland, College Park, Maryland 20742
• OSTI ID: 5406065
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:8; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BREMSSTRAHLUNG
CYCLOTRON RADIATION
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
FAR INFRARED RADIATION
HOT PLASMA
INFRARED RADIATION
MAGNETIC MIRRORS
MICROWAVE RADIATION
OPACITY
OPEN PLASMA DEVICES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
TANDEM MIRRORS
THERMONUCLEAR DEVICES
TMX DEVICES