Development of inside launch reflectometer systems on the DIII-D tokamak

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

DOI:https://doi.org/10.1063/1.1146013· OSTI ID:6561246

Doyle, E J; Rhodes, T L; Doane, J L; Peebles, W A ^[1]

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

Inside launch (high field side) reflectometry is necessary for routine core access on DIII-D and is a very attractive option for ITER and TPX. For high temperature reactor relevant plasmas, relativistic corrections for the left-hand cutoff (inside launched) are relatively small, whereas these substantially affect the location of the normal right hand cutoff. On DIII-D, core access using the right hand cutoff is restricted to low density plasmas, while [ital O]-mode polarization is incompatible with flat [ital H]-mode density profiles. Routine core access can, however, be obtained using the left-hand cutoff and inside launch. On ITER and TPX, outside launch [ital X]-mode systems need to operate at high frequency, [similar to]100--250 GHz, such that the left-hand cutoff, which is at much lower frequency, [similar to]0--75 GHz, is an attractive option for high density operation. In addition, inside launch reflectometry can be used to investigate plasma asymmetries; on DIII-D an inboard/outboard asymmetry in turbulence response is observed at the [ital L]-[ital H] transition. An upgraded inside launch reflectometer system was recently installed on DIII-D, specifically to investigate the use of the left hand [ital X]-mode cutoff and inside launch for profile and turbulence measurements in reactor relevant plasmas. This system will also provide routine core access for reflectometry on DIII-D.

• DOE Contract Number: FG03-86ER53225; AC03-89ER51114
• OSTI ID: 6561246
• 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
PLASMA DIAGNOSTICS
MICROWAVE RADIATION
ASYMMETRY
REFLECTION
TURBULENCE
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)
700412 - Magnetic Confinement Devices- (1992-)