BOLOMETRY IN WENDELSTEIN VII-A
In the currentless phase of NB heated discharges in W VII-A the radiation owing to accumulation of impurities (mainly oxygen) rises drastically towards the end of the discharge. Local radiation peaks at the plasma edge indicate poloidal asymmetries of the radiation profile. If these are neglected, Abel inversion can be used to obtain the local radiation. Simultaneous bolometric measurements using a horizontal viewing position reveals broader radiation profiles as well as enhanced total radiation. The deviations begin in the currentless phase and increase in time. The discrepancy cannot totally be explained by including poloidal asymmetries into the data analysis.
Bibliographic Reference: 5TH INTERNATIONAL WORKSHOP ON STELLARATORS, SCHLOSS RINGBERG, BAVARIA (GERMANY), SEPT. 24-28, 1984 VOL. II, PP. 427-436, EUR 9618 EN (1985) FS, VOL. I AND VOL. II, 787 P., BFR 3500 (BOTH VOLUMES), EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989124113600 / Last updated on: 1987-01-01
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