The charge exchange recombination diagnostic system on the DIII-D tokamak
The charge exchange recombination (CER) diagnostic system on the DIII-D tokamak is used to make spatially and temporally resolved measurements of the ion temperature and toroidal and poloidal rotation velocities. This is performed through visible spectroscopic measurements of the Doppler broadened and Doppler shifted HE II 468.6 nm, the CVI 529.1 nm, and the BV 494.5 nm spectral lines which have been excited by charge exchange recombination interactions between the fully stripped ions and the neutral atoms from the heating beams. The plasma viewing optics comprises 32 viewing chords spanning a typical plasma minor radius of 63 cm across the midplane, of which 15 spatial chords span 4.2 cm at the plasma edge just within the separatrix and provide a chord-to-chord spatial resolution of 0.3 cm. Fast camera readout electronics can provide a temporal resolution of 260 {mu}s per time slice, but the effective minimum integration time, at present, is 1 ms which is limited by the detected photon flux from the plasma and the decay times of the phosphors used on the multichannel plate image intensifiers. Significant changes in the edge plasma radial electric field at the L-H transition have been observed, as determined from the CER measurements, and these results are being extensively compared to theories which consider the effects of sheared electric fields on plasma turbulence. 13 refs., 10 figs.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 6152340
- Report Number(s):
- GA-A-20652; CONF-910968-47; ON: DE92003805
- Resource Relation:
- Conference: 14. IEEE symposium on fusion engineering, San Diego, CA (United States), 30 Sep - 3 Oct 1991
- Country of Publication:
- United States
- Language:
- English
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High spatial and temporal resolution visible spectroscopy of the plasma edge in DIII-D
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Related Subjects
DOUBLET-3 DEVICE
PLASMA DIAGNOSTICS
CHARGE EXCHANGE
IMAGE INTENSIFIERS
ION TEMPERATURE
OPTICAL SYSTEMS
RECOMBINATION
TEMPERATURE DISTRIBUTION
CLOSED PLASMA DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)