This work supported by the U.S. Department of Erfsrgy Contract No. DE-AC02-76-CHO-3073. Reproduction, trans-? Fatten, publfcatlon, use and disposal, ]n Mhole or In z part, by or for the United States Government Is permitted.

No abstract

The luminous region of the plasma cloud surrounding deuterium pellets injected into a tokamak is studied spectroscopically. At the time of peak luminosity the electron density is 2.4x 10 17 cm -3 to within 30% and the temperature is at most 2.0 eV. The intensity ratio of the Balmer-alpha and -beta light from the pellets, the total number of emitted photons, and the apparent size of the radiating region are consistent with local thermodynamic equilibrium at this temperature and density.PACS numbers: 52.40. Hf, 52.70.Kz In the past decade experiments have been performed in which pellets of solid hydrogen or deuterium with dimensions of 0.070-4.0 mm and velocities of 90-1300 m/s were injected into tokamak plasmas.