Optimized baffle and aperture placement in neutral beamlines
Most neutral beamlines contain an iron-core ion-bending magnet that requires shielding between the end of the neutralizer and this magnet. This shielding allows the gas pressure to drop prior to the beam entering the magnet and therefore reduces beam losses in this drift region. We have found that the beam losses can be reduced even further by eliminating the iron-core magnet and the magnetic shielding altogether. The required bending field can be supplied by current coils without the iron poles. In addition, placement of the baffles and apertures can affect the cold gas entering the plasma region and the losses in the neutral beam due to re-ionization. In our study we varied the placement of the baffles, which determine the amount of pumping in each chamber, and the apertures, which determine the beam loss. Our results indicate that a baffle/aperture configuration can be set for either minimum cold gas into the plasma region or minimum beam losses, but not both.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA); TRW, Inc., Redondo Beach, CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5507634
- Report Number(s):
- UCRL-89320; CONF-831203-31; ON: DE84003746
- Resource Relation:
- Conference: 10. symposium on fusion engineering, Philadelphia, PA, USA, 5 Dec 1983
- Country of Publication:
- United States
- Language:
- English
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MFTF DEVICES
NEUTRAL ATOM BEAM INJECTION
NEUTRAL BEAM SOURCES
BAFFLES
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GASES
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CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUIDS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
OPENINGS
SHIELDING
THERMONUCLEAR DEVICES
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