Plasma radiometry with 30 chord resolution for fast transients in the DIII-D tokamak

A diagnostic capable of providing time resolved measurements of plasma radiated power during disruptions and other fast transients, e.g., edge localized modes has been employed in the DIII-D tokamak. The radiation is detected with absolute extreme ultraviolet (AXUV) photodiode arrays. Thirty chords...

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Bibliographic Details
Published in:Review of Scientific Instruments 2004-10, Vol.75 (10), p.4133-4135
Main Authors: Gray, D. S., Hollmann, E. M., Luckhardt, S. C., Chalfant, J., Chousal, L., Hernandez, R., Jones, E., Kellman, A. G.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOLOMETERS
DOUBLET-3 DEVICE
EDGE LOCALIZED MODES
EXTREME ULTRAVIOLET RADIATION
MHZ RANGE 01-100
PHOTODIODES
PHOTOMETRY
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
RADIATION DETECTION
TIME RESOLUTION
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Description
Summary:A diagnostic capable of providing time resolved measurements of plasma radiated power during disruptions and other fast transients, e.g., edge localized modes has been employed in the DIII-D tokamak. The radiation is detected with absolute extreme ultraviolet (AXUV) photodiode arrays. Thirty chords from a single port provide measurements from a full slice of the plasma at one toroidal location. The analog bandwidth is up to 1  MHz for the brightest events, i.e., disruptions. Active cooling of the diode arrays prevents damage during high temperature vessel baking. Effective responsivity values of 0.12–0.18  A / W are taken from previous work on the application of AXUV diodes in DIII-D. The total radiated energy in disruptions typically agrees with bolometer measurements within about 12%.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1787149