Design and Performance of NSTX Movable GDC Probe

Author

Kugel, H.W. ; Maingi, R. ; Bell, Michael ; Blanchard, W. ; Gates, D. ; Gernhardt, R.

Author_Institution

Princeton Plasma Phys. Lab., Princeton

fYear

2007

fDate

17-21 June 2007

Firstpage

1

Lastpage

4

Abstract

The NSTX GDC system has been improved by replacing one of the two fixed anodes with a movable GDC probe (MGP) anode that can be inserted 1.2 m to about midway between the inner and outer vessel walls. The purpose was to provide more spatially uniform HeGDC for improving discharge stability and reliability. The MGP has been used reliably between every discharge during the last two NSTX experimental campaigns. It has also been used to apply HeGDC assisted boronization, and more recently, HeGDC assisted lithiumization. The MGP has contributed to improved NSTX performance during long pulse and H-mode discharges, and enabled a faster discharge repetition rate.

Keywords

Tokamak devices; anodes; glow discharges; plasma chemistry; plasma impurities; plasma probes; plasma-wall interactions; H-mode discharges; He glow discharge cleaning assisted boronization; He glow discharge cleaning assisted lithiumization; National Spherical Torus Experiment; anodes; discharge stability; impurity control; inner vessel wall; long pulse discharge; movable glow discharge cleaning probe; outer vessel wall; tokamaks; Anodes; Bellows; Breakdown voltage; Ceramics; Cleaning; Glow discharges; Ground support; Laboratories; Plasmas; Probes; component; glow discharge cleaning; impurity control; tokamaks; wall conditioning;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 2007. SOFE 2007. 2007 IEEE 22nd Symposium on

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-1193-1

Electronic_ISBN

978-1-4244-1194-8

Type

conf

DOI

10.1109/FUSION.2007.4337871

Filename

4337871