High spatial and temporal resolution visible spectroscopy of the plasma edge in DIII-D
- General Atomics, San Diego, California 92186-9084 (USA)
In DIII-D, visible spectroscopic measurements of the He II 468.6 nm and C VI 529.2 nm Doppler broadened spectral lines, resulting from charge exchange recombination interactions between beam neutral atoms and plasma ions, are performed to determine ion temperatures, and toroidal and poloidal rotation velocities. The diagnostics system comprises 32 viewing chords spanning a typical minor radius of 63 cm across the midplane, of which 16 spatial chords span 11 cm of the plasma edge just within the separatrix. A temporal resolution of 260 {mu}s per time slice can be obtained as a result of using MCP phosphors with short decay times and fast camera readout electronics. Results from this system will be used in radial electric field comparisons with theory at the L--H transition and ion transport analysis.
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 6135075
- Journal Information:
- Review of Scientific Instruments; (USA), Vol. 61:10; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DOUBLET-3 DEVICE
PLASMA DIAGNOSTICS
OPTICAL SPECTROMETERS
ATOMIC BEAMS
DOPPLER EFFECT
ELECTRON MULTIPLIER DETECTORS
ION TEMPERATURE
ION-ATOM COLLISIONS
MICROCHANNEL ELECTRON MULTIPLIERS
PHOSPHORS
RESOLUTION
ATOM COLLISIONS
BEAMS
CLOSED PLASMA DEVICES
COLLISIONS
ELECTRON MULTIPLIERS
ELECTRON TUBES
ION COLLISIONS
MEASURING INSTRUMENTS
RADIATION DETECTORS
SPECTROMETERS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics