A 250-GHz microwave interferometer for divertor experiments on DIII-D

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146365· OSTI ID:6711479

James, R A; Nilson, D G; Stever, R D; Hill, D N; Casper, T A ^[1]

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1. Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)

A new 250-GHz, two-frequency microwave interferometer system has been developed to diagnose divertor plasmas on DIII-D. This diagnostic will measure the line-averaged density across both the inner and outer, lower divertor legs. With a cutoff density of over 7[times]10[sup 14] cm[sup [minus]3], temporal measurements of edge localized modes (ELMs) and plasma detachment are expected. The outer-leg system will use a double-pass method while the inner-leg system will be single pass. Two special three-dimensional (3D) carbon composite tiles are used, one to protect the microwave antennas mounted directly under the strike point and the other as the outer-leg reflecting surface. Performance, design constraints, and the thermal-mechanical design of the 3D carbon composite tiles are discussed.

• OSTI ID: 6711479
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CLOSED PLASMA DEVICES
DIVERTORS
DOUBLET-3 DEVICE
ELECTRONIC EQUIPMENT
EQUIPMENT
INTERFEROMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES