Physics – General Physics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrva..36..795k&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 36, July 15, 1987, p. 795-803.
Physics
General Physics
19
High Temperature Plasmas, Line Spectra, Tokamak Devices, X Ray Spectra, Electron Energy, Helium Ions, High Resolution
Scientific paper
A high-resolution crystal spectrometer was used to perform time-resolved measurements of Ti XXI - Ti XIX X-ray line spectra from an ohmically heated plasma with neon puffing in the JIPP-T-II-U tokamak. The data were analyzed on the basis of a collisional radiative model. The electron temperature Te was obtained every 20 ms from the intensity ratios of the satellite lines to the resonance line. It is found that the plasma is in an ionizing phase at the beginning, nearly reaches an equilibrium around 80 ms, and then enters into a recombination phase, thereafter following the decrease of Te. The observed intensity ratios Ix/Iw and Iy/Iw were always more than twice as large as the theoretical ones. The discrepancies increased in the later period of the plasma after Te decreased, in contrast to the result obtained by Bitter et al. (1985).
Hayakawa Saito
Kato Takako
Masai Kuniaki
Morita Shigeru
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