Status of the START neutral beam injection project
- UKAEA Government Div., Abingdon (United Kingdom)
- Oak Ridge National Lab., TN (United States)
A major advantage of spherical tokamaks is their potential for achieving high beta and high plasma density in modest sized plasmas using low magnetic field. Given this combination of low field and high density, neutral beam injection can provide effective auxiliary heating for the next generation of spherical tokamaks. A neutral beam injector, shipped recently from Oak Ridge National Laboratory as part of an ongoing collaboration on spherical tokamak research, has now been installed onto the START (Small Tight Aspect Ratio Tokamak) experiment at Culham Laboratory. Modifications to START have included in-situ machining of a new 31cm diameter port for NBI, plus the installation of a new graphite neutral beam stop equipped with thermocouples to provide beam profile and shinethrough diagnosis. The major modification to the NBI beamline has been the installation of an optical fiber coupled control and instrumentation system. The injector will be operated without cryopumps in a volume pumped configuration, and should provide 0.5MW of injected hydrogen neutral power at a beam energy of 40keV for 20ms pulses. The status of the installation and commissioning program is reported.
- Sponsoring Organization:
- Department of Trade and Industry, London (United Kingdom); USDOE, Washington, DC (United States)
- OSTI ID:
- 465033
- Report Number(s):
- CONF-950905--; ISBN 0-7803-2969-4
- Country of Publication:
- United States
- Language:
- English
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