Internal, nonperturbing, radio frequency wave monitor reflectometer system on the DIII-D tokamak[sup a]

Journal Article · Wed Feb 01 00:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146011· OSTI ID:6575210

Lee, J H; Doyle, E J; Luhmann, Jr, N C; Peebles, W A; Petty, C C; Pinsker, R I; Rettig, C L; Rhodes, T L ^[1]

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1. Institute of Plasma and Fusion Research, Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States)

A new reflectometer system designed to monitor density fluctuations associated with rf waves has been successfully demonstrated on the DIII-D tokamak. It is a direct, internal, and nonperturbing diagnostic with access into the plasma core. This new diagnostic is motivated by a desire to improve understanding of rf wave physics issues, such as wave trajectory, heating mechanisms, rf wave deposition profile, and wave number, and is highly relevant to planned tokamaks such as ITER and TPX. This work is the first application of reflectometry to rf wave studies in a tokamak. Feedforward tracking receiver techniques are employed to remove frequency instabilities due to inherent drifts in the microwave sources and frequency pulling. In order to minimize spurious pickup of the rf pulse ([similar to]60 MHz), heterodyne detection techniques are utilized, and all components are installed inside an rf shielding box. The system operates in the extraordinary mode ([ital X]-mode) at 70 GHz. In this paper, a detailed description of the system, and data illustrating its successful operation will be presented.

• DOE Contract Number: FG03-86ER53225; AC03-89ER51114
• OSTI ID: 6575210
• Journal Information: Review of Scientific Instruments; (United States), Vol. 66:2; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
FAST MAGNETOACOUSTIC WAVES
PLASMA DIAGNOSTICS
MICROWAVE RADIATION
FLUCTUATIONS
GHZ RANGE 01-100
HETERODYNE RECEIVERS
PLASMA DENSITY
RADIOWAVE RADIATION
REFLECTION
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
HYDROMAGNETIC WAVES
MAGNETOACOUSTIC WAVES
MICROWAVE EQUIPMENT
RADIATIONS
RADIO EQUIPMENT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)
700340 - Plasma Waves
Oscillations
& Instabilities- (1992-)
700412 - Magnetic Confinement Devices- (1992-)