Receiver calibration of the JET fast ion and alpha particle diagnostic

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143648· OSTI ID:7153968

Machuzak, J S; Woskov, P P ^[1]; Bindslev, H; Comiskey, M; Fessey, J; Hoekzema, J A; Hughes, T P ^[2]; Orsitto, F ^[3]

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1. MIT Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)
2. JET Joint Undertaking, Abingdon, Oxon OX14 3EA (United Kingdom)
3. ENEA CRE Frascati (Italy)

A collective Thomson scattering diagnostic is being implemented at JET to diagnose the velocity distribution and density of alpha particles and energetic ions. This diagnostic consists of a number of major subsystems including: a high-power 140-GHz gyrotron, a 32-channel 12-GHz bandwidth heterodyne receiver, efficient corrugated waveguide systems, variable polarizers, and in vacuum beam steering mirrors. Proper calibration of these subsystems for signal level losses, positioning, and polarization is imperative for the successful operation of the diagnostic and to facilitate the interpretation of the scattered data. A low-power Gunn oscillator was used to verify the polarization rotation induced by the seven miter bends in the receiver transmission line. The full bandwidth receiver front end losses, including the sapphire tokamak vacuum window, were initially calibrated by using the hot tokamak vessel wall as a blackbody source at approximately 310 {degree}C. Background ECE measurements will be presented.

• DOE Contract Number: FG02-91ER54109
• OSTI ID: 7153968
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:10; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
ALPHA PARTICLES
AMPLIFIERS
CALIBRATION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 100-1000
HETERODYNE RECEIVERS
INELASTIC SCATTERING
ION TEMPERATURE
JET TOKAMAK
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
PLASMA DIAGNOSTICS
POLARIZATION
RADIO EQUIPMENT
SCATTERING
THERMONUCLEAR DEVICES
THOMSON SCATTERING
TOKAMAK DEVICES