National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Investigation of HHFW and NBI Combined Heating in NSTX.

DE2005839176

Publication Date	2005
Personal Author	LeBlanc, B. P.; Bell, R. E.; Bernabei, S.; Biewer, T. M.; Hosea, J. C.
Page Count	12
Abstract	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.
Keywords	Auxiliary heating Plasmas Heating Electron temperature Ion temperature Spectroscopy Neutrons Stored energy National Spherical Torus Experiment(NSTX)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603

Investigation of HHFW and NBI Combined Heating in NSTX.

Investigation of HHFW and NBI Combined Heating in NSTX.
DE2005839176

Publication Date	2005
Personal Author	LeBlanc, B. P.; Bell, R. E.; Bernabei, S.; Biewer, T. M.; Hosea, J. C.
Page Count	12
Abstract	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.
Keywords	Auxiliary heating Plasmas Heating Electron temperature Ion temperature Spectroscopy Neutrons Stored energy National Spherical Torus Experiment(NSTX)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603