Performance characteristics of NBSTF, the prototype neutral-beamline for TFTR
Conference
·
OSTI ID:5666776
The Neutral Beam System Test Facility (NBSTF) at the Lawrence Berkeley Laboratory is a shielded facility for prototype development and testing of the multi-megawatt neutral-beam injection system for the Tokamak Fusion Test Reactor (TFTR) at the Princeton Plasma Physics Laboratory. NBSTF includes: a power system capable of regulated, rapidly switched 120-kV, 75-A, 1.5-sec pulses every three minutes; the cryopumped TFTR prototype beamline with calorimeter, sweep magnet, ion dump, duct, and a target calorimeter; and a computer controls and diagnostic system. Beam-diagnostic systems include: temperature profiles on calorimeter, target dump, and ion dump; temperature measurements on neutralizer and beam scrapers; water-flow calorimetry; Doppler-shift spectroscopy and an electrostatic analyzer; and an array of pressure gauges to determine gas distribution. Beam operation at 120 kV, 65 A, 0.8 sec has been achieved with a molecular-ion mixture of 60% D/sup +//30% D/sub 2//sup +//10% D/sub 3//sup +/. Limited operation with an improved plasma source has yielded 80% D/sup +//15%D/sub 2//sup +//5%D/sub 3//sup +/ at 120 kV, 67A, 0.5 sec. The estimated 120-keV D/sup 0/ power delivered with twelve ion sources to TFTR is 17 +/-2 MW for the standard plasma source and 22 +/-4 MW for the improved source.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5666776
- Report Number(s):
- LBL-13506; CONF-811040-137; ON: DE82004843
- Country of Publication:
- United States
- Language:
- English
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