Investigation of HHFW and NBI Combined Heating in NSTX

Technical Report · Wed Apr 27 00:00:00 EDT 2005

DOI:https://doi.org/10.2172/839176· OSTI ID:839176

LeBlanc, B P ^[1]; Bell, R E; Bernabei, S; Biewer, T M; Hosea, J C; Wilson, J R

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1. Princeton Plasma Physics Laboratory

A series of experiments was conducted to investigate the combined utilization of high-harmonics fast-wave (HHFW) and neutral-beam injection (NBI) auxiliary heating in National Spherical Torus Experiment (NSTX) plasmas. A modest increase of the total stored energy coincident with a near doubling of the neutron production rate is observed when NBI heating is added to HHFW in L-mode plasmas. An increase in the core electron temperature is also observed. On the other hand, essentially no stored energy augmentation nor neutron production rate enhancement is observed when applying HHFW during the ''H'' phase of NBI-driven H-mode plasmas. Spectroscopic measurements of the edge carbon line radiation indicate an unpredicted ion temperature increase, suggesting that edge effects are reducing the amount of HHFW power reaching the plasma core.

• Research Organization: Princeton Plasma Physics Lab., Princeton, NJ (US)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 839176
• Report Number(s): PPPL-4067
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AUXILIARY HEATING
CARBON
ELECTRON TEMPERATURE
HEATING
ION CYCLOTRON WAVES
ION TEMPERATURE
NEUTRONS
NUETRAL BEAMS
PLASMA
PRODUCTION
RADIATIONS
RF HEATING
STORED ENERGY