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A source of suprathermal atoms was developed consisting of a laser system which ablates small portions of coating materials from the rear side of a glass substrate. The coating can be either a single species or a multilayer of several-thousand-angstrom thickness. Neutral particle beams produced by this method can have energies in the range of about 10eV and penetrate into the plasma up to line densities of about nl = 1.0 E+11 cm. For the determination of the electron temperature two elements were chosen, the ionization and excitation cross sections of which differ in the range up to 100eV. For TEXTOR a two-component target with a C-LiF coating is used, which delivers a Li and C beam with about 5- and 15-eV energy, respectively, ablated by a ruby laser with 1-J energy. The beam attenuation is determined from the emitted light using a camera with a Si-diode array system for spatial recording. The different attenuations and emission characteristics then allow the determination of radial electron density and temperature profiles over the spatial range from the liner into a few centimeters beyond the limiter.

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Authors: POSPIESZCZYK A, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE);ROSS G G, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE)
Bibliographic Reference: Paper presented: 7th Topical Conference on High Temperature Plasma Diagnostics, Napa (US), March 13-17, 1988 Article: Rev. Sci. Instrum. Vol 59 (1988) No. 8, pp. 1491-1493
Availability: Available from (1) as Paper EN 34532 ORA
Record Number: 198910313 / Last updated on: 1994-12-01
Original language: en
Available languages: en