TFTR microwave reflectometer (abstract)

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

DOI:https://doi.org/10.1063/1.1143653· OSTI ID:7259319

Mazzucato, E; Nazikian, R; Bretz, N; McCarthy, M; Nagy, A ^[1]

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1. Princeton University, Princeton, New Jersey 08543 (United States)

A microwave reflectometer is in operation on TFTR for the measurement of density fluctuations. The system operates in the {ital X} mode and comprises three channels with fixed frequencies of 140, 132, and 125 GHz, and one with stepped frequency of 111--123 GHz. All channels use solid state Gunn oscillators and a heterodyne detection scheme. The system is located outside of the TFTR test cell with the power conveyed to the tokamak vessel by low-loss corrugated waveguides and remotely controlled parabolic mirrors. Preliminary results indicate that the level of density fluctuations with {ital k}{sub {perpendicular}} {lt}1 cm{sup {minus}1} is very small in the central region of Ohmic plasmas ({ital {tilde n}}/{ital n}{lt}10{sup {minus}3}), and that it increases monotonically with minor radius to values of {approx}10{sup {minus}2} at {ital r}/{ital a}=0.9. This work supported by U.S. Department of Energy Contract No. DE-AC02-76-CHO-3073.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7259319
• 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-)
CLOSED PLASMA DEVICES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUCTUATIONS
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 100-1000
HETERODYNE RECEIVERS
MICROWAVE EQUIPMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
RADIO EQUIPMENT
REFLECTION
TFTR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS