GLOW DISCHARGE CONDITIONING OF THE PDX VACUUM VESSEL.

H. F. Dylla, S. A. Cohen, S. M. Rossnagel, G. M. McCracken, Ph Staib

Research output: Contribution to journalConference article

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Abstract

A glow discharge technique is described for the conditioning of the large (38 m**3) Poloidal Divertor Experiment (PDX) vacuum vessel. The discharge parameters and working gas (H//2) were chosen to maximize C and O removal and minimize metal sputtering. The glow discharge was produced by biasing one or two internal anodes at 400 V to sustain a discharge current of 2-4 A per anode. Purified H//2 at a pressure of 3 multiplied by 10** minus **2 Torr was flowed through PDX at approximately 10 Torrl/s. The effectiveness of the glow discharge conditioning was monitored by measuring impurity gas (CH//4, C//2H//4, and CO) exhaust rates by mass spectrometry and C and O surface removal rates by in situ AES and XPS. Low Z(eff) high-power discharges were obtained in PDX after 120 h of glow discharge treatment, during which more than 100 equivalent monolayers of C and O were removed from the vessel.

Original languageEnglish (US)
Pages (from-to)286-290
Number of pages5
JournalJournal of vacuum science & technology
Volume17
Issue number1
DOIs
StatePublished - Jan 1 1979
EventProc of the Natl Symp of the Am Vac Soc, 26th - New York, NY, USA
Duration: Oct 1 1979Oct 5 1979

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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