Wall conditioning in ATF (Advanced Toroidal Facility)
Techniques for cleaning and conditioning the vacuum vessel of the Advanced Toroidal Facility (ATF) and its internal components are described. The vacuum vessel cleaning technique combines baking to 150/degree/C and glow discharges with hydrogen gas. Chromium gettering is used to further condition the system. The major internal components are the anodized aluminium baffles in the Thomson scattering system, a graphite-shielded ICRF antenna, two graphite limiters, and a diagnostic graphite plate. Three independent heating systems are used to bake some of the major components of the system. The major characteristics used for assessing cleanliness and conditioning progress are the maximum pressure attained during bakeout, the result of gas analysis, and relevant plasma parameters (e.g., time to radiative decay). Details of the various cleaning and conditioning procedures and results are presented. 5 refs., 8 figs., 3 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6189408
- Report Number(s):
- CONF-890403-23; ON: DE89012970
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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ANTENNAS
ATF TORSATRON
BAKING
CARBON
CLEANING
CLOSED PLASMA DEVICES
CONTAINERS
ELECTRICAL EQUIPMENT
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
FIRST WALL
GRAPHITE
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
INELASTIC SCATTERING
LIMITERS
MINERALS
NONMETALS
PERFORMANCE
PLASMA HEATING
PRESSURE VESSELS
PUMPING
SCATTERING
STELLARATORS
SURFACE CLEANING
SURFACE FINISHING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
THOMSON SCATTERING
TORSATRON STELLARATOR
VACUUM SYSTEMS