Reflectometry as a fluctuation diagnostic: A one-dimensional simulation

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

DOI:https://doi.org/10.1063/1.1143658· OSTI ID:7250873

Chou, A E; Luhmann, Jr, N C; Peebles, W A; Rhodes, T L ^[1]

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1. Electrical Engineering Department, University of California at Los Angeles, Los Angeles, California 90024-1594 (United States)

Reflectometry is currently employed to characterize turbulence in fusion plasmas worldwide and is expected to be a major diagnostic on the next generation of machines (e.g., ITER). Until recently, little was known about the response of a reflectometer to fluctuations (degree of localization of the signal, sensitivity to fluctuation wave number, dependence on density scale length, etc.). To elucidate these properties, we have been modeling reflectometer behavior with a code based on solution of a one-dimensional full wave equation. The code models an infinite plane plasma with density gradient in the {ital x} direction and solves the full wave equation to find the electric field of the reflectometer's electromagnetic wave. It can simulate stationary and moving density perturbations with arbitrary waveforms and wave numbers in plasmas with arbitrary density profiles. We present results of test cases comparing computational results to known analytic solutions for linear and 1{minus}{alpha}{sup 2}/{ital x}{sup 2} plasma density profiles, which show very good agreement.

• DOE Contract Number: FG03-86ER53225
• OSTI ID: 7250873
• Journal Information: Review of Scientific Instruments; (United States), Vol. 63:10; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA DIAGNOSTICS
OPTICAL REFLECTION
FLUCTUATIONS
ION ACOUSTIC WAVES
ONE-DIMENSIONAL CALCULATIONS
PLASMA DENSITY
PLASMA SIMULATION
WAVE EQUATIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
ION WAVES
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA WAVES
REFLECTION
SIMULATION
VARIATIONS
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)