Gas pressure in the end plug regions of the TMX-U thermal barrier experiment
We consider briefly the upper bound on background pressure (0.5 to 1.0 x 10/sup -6/ Torr) that is required for operation of the thermal barrier end plugs of TMX-U and propose a rate equation for pressure buildup that includes terms for neutral beam injection and wall reflux. During early operation of TMX-U the background pressure exceeded this upper bound; in addition, axial end plugging of plasma losses seemed limited by the excessive pressure. Modifications to the vacuum system to decrease this pressure to the desired range are described. Furthermore, wall reflux is shown to depend linearly on pressure. We conclude with an example of the dramatic increase in time duration of axial plugging of plasma losses with the reduced background pressure.
- Research Organization:
- Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6040704
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Vol. 2:4
- Country of Publication:
- United States
- Language:
- English
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TMX DEVICES
CLOSURES
OPERATION
VACUUM SYSTEMS
VAPOR PRESSURE
PLASMA
PRESSURE EFFECTS
TEMPERATURE EFFECTS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PHYSICAL PROPERTIES
TANDEM MIRRORS
THERMODYNAMIC PROPERTIES
THERMONUCLEAR DEVICES
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