Publication Date:
2019-07-13
Description:
To investigate the importance to fusion devices of desorption of gas from walls or cryosurfaces under long time operation, preliminary mass spectrometric investigations were carried out on the NASA Lewis Bumpy Torus with a 0.1-2A discharge in D2 at a pressure of 4.0 to 6.6 x 0.00001 torr. During the initial tens of minutes of discharge operation large quantities of a component with mass number 28, believed to be nitrogen, were released. The decrease with time of the nitrogen density after its initial maximum, indicated a diffusion controlled outgassing from cryodeposits or wall material. When cold surfaces were allowed to warm up, large quantities of gas were released. The integrated amount of N2 was typically the same as that released during a discharge, while the amount of H2O was orders of magnitude larger.
Keywords:
PLASMA PHYSICS
Type:
NASA-TM-X-71639
,
E-8191
,
Ann. Meeting of the Plasma Phys. Div. of the Am. Phys. Soc.; Oct 28, 1974 - Oct 31, 1974; Albuquerque, NM; United States
Format:
application/pdf
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