2009
DOI: 10.1088/0029-5515/49/7/075015
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Abstract: Abstract. Recent results obtained with high harmonic fast wave (HHFW) heating and current drive (CD) on NSTX strongly support the hypothesis that the onset of perpendicular fast wave propagation right at or very near the launcher is a primary cause for a reduction in core heating efficiency at long wavelengths that is also observed in ICRF heating experiments in numerous tokamaks. A dramatic increase in core heating efficiency was first achieved in NSTX L-mode helium majority plasmas when the onset for perpend… Show more

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Cited by 42 publications
(55 citation statements)
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“…The former is in agreement with the experimental observations found in NSTX [6,17,18,19,20] and DIII-D [2]. On the other hand, the latter is not easy to link directly to the experimental observations and additional studies might be required.…”
Section: Discussionsupporting
confidence: 89%
See 1 more Smart Citation
“…The former is in agreement with the experimental observations found in NSTX [6,17,18,19,20] and DIII-D [2]. On the other hand, the latter is not easy to link directly to the experimental observations and additional studies might be required.…”
Section: Discussionsupporting
confidence: 89%
“…In the recent years, a large effort has been made to understand the main physical mechanisms behind the interaction between RF waves and the SOL, such as parametric decay [11,3,12,13], sheath effects [14,15], etc.. Recently, experimental studies employing high harmonic fast wave (HHFW) heating on the National Spherical Torus eXperiment (NSTX) [16], a low aspect ratio tokamak, have shown that substantial HHFW power loss (up to 60% of the HHFW power coupled from the antenna) can occur along the open field lines in the SOL [6,17,18,19,20]. This paper examines FW power loss in the SOL by using the numerical full wave simulation code AORSA [21], in which the edge plasma beyond the last closed flux surface (LCFS) is included in the solution domain [22].…”
Section: Introductionmentioning
confidence: 99%
“…This requires good coupling of the RF power to the core plasma with minimal deposition in the edge region to avoid erosion on the antenna, wall and limiters [e.g., 1 -3], as well as in the divertor scrape off regions [4,5]. Under high-harmonic fast wave (HHFW) heating conditions, the GENRAY [6] and AORSA [7] RF wave models show that even at the lowest toroidal wavenumbers of interest, k φ ~ 3 m -1 , the waves entering the core plasma are damped in about half an orbit around the machine, and wave fields are very low near the center stack [8,9]. Since single-pass damping is very large, edge power loss must occur prior to the fast waves entering the last closed flux surface (LCFS).…”
Section: Introductionmentioning
confidence: 99%
“…Since single-pass damping is very large, edge power loss must occur prior to the fast waves entering the last closed flux surface (LCFS). Consequently, NSTX serves as an ideal platform for separating HHFW RF power deposition in the core and the edge [8,9].…”
Section: Introductionmentioning
confidence: 99%
“…High Harrmonic Fast Wave(HHFW) current drive in frequency range of (ω ci ≪ ω ≪ ω lh ) was suggested in 1995 [2] and it was observed that the current drive is in well agreement with the theory and simulation via MSE measurement. [3] The fast wave close to LHR(Lower Hybrid Resonance) with harmonic number about 20-40 (ω ci ≪ ω < lh ) has beenrecently suggested for off-axis current drive. And it is planned to confirm the theory in KSTAR and DIIID.…”
Section: Introductionmentioning
confidence: 99%