The multipulse Thomson scattering diagnostic on the DIII-D tokamak

The authors describe the design and operation of a 40 spatial channel Thomson scattering system that uses multiple 20-Hz Nd:YAG lasers to measure the electron temperature and density profiles periodically throughout an entire plasma discharge. Interference filter polychromators disperse the scattere...

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Bibliographic Details
Main Authors: Carlstrom, T.N., Campbell, G.L., DeBoo, J.C., Evanko, R.G., Evans, J., Greenfield, C.M., Haskovec, J.S., Hsieh, C.L., McKee, E.L., Snider, R.T., Stockdale, R.E., Thomas, M.P., Trost, P.K.
Format: Conference Proceeding
Language:English
Subjects:
Density measurement
Electrons
Laser modes
Light scattering
Optical design
Plasma density
Plasma measurements
Plasma temperature
Temperature measurement
Tokamaks
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Summary:The authors describe the design and operation of a 40 spatial channel Thomson scattering system that uses multiple 20-Hz Nd:YAG lasers to measure the electron temperature and density profiles periodically throughout an entire plasma discharge. Interference filter polychromators disperse the scattered light, which is detected by silicon avalanche photodiodes. The measurable temperature range is from 10 eV to 20 keV, and the minimum detectable density is about 2*10/sup 18/ m/sup -3/. Laser control and data acquisition are performed in real time by a VME-based microcomputer. Data analysis is performed by a MicroVAX 3400. Unique features of this system include burst mode operation, where multiple lasers are fired in rapid succession (
DOI:10.1109/FUSION.1991.218657