The visible, imaging diode arrays on Alcator C-Mod

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

DOI:https://doi.org/10.1063/1.1146349· OSTI ID:7060545

Terry, J L; Snipes, J A; Kurz, C ^[1]

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1. MIT Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)

A set of multichord, absolutely calibrated viewing arrays has been used to measure the distributions of H/D and C[sup +2] emissions. A total of 227 chordal views are available, with the chords separated at the plasma by [similar to]1 cm typically. The chord brightness profiles have been combined and inverted (without recourse to symmetry assumptions) to yield local volume emission rates. Because of the thickness of the superstructure surrounding Alcator C-Mod, the views are from points re-entrant to the vacuum vessel. All but one of the arrays employ 64-channel, linear diode arrays, which are read out serially, thus requiring only one digitizer channel per array. Variable frame rates ([similar to]1 Hz to [similar to]3.5 kHz) result in an extremely large dynamic range for these detectors. A 35-channel diode array which is read out in parallel and can track fast events like ELMs or pellets is also in use.

• DOE Contract Number: AC02-78ET51013
• OSTI ID: 7060545
• 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-)
ALCATOR DEVICE
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
IMAGE PROCESSING
IONIZATION
PLASMA DIAGNOSTICS
PROCESSING
RADIATIONS
RESOLUTION
SPATIAL RESOLUTION
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VISIBLE RADIATION