Fast Wave Ion Cyclotron Resonance Heating Experiments on the Alcator C Tokamak PDF Download
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Author: Thomas Donavon Shepard
Publisher:
ISBN:
Category :
Languages : en
Pages : 207
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Book Description
Author: Thomas Donavon Shepard
Publisher:
ISBN:
Category :
Languages : en
Pages : 207
Get Book Here
Book Description
Author: Thomas Donavon Shepard
Publisher:
ISBN:
Category :
Languages : en
Pages : 207
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Fast waves at harmonics of the ion cyclotron frequency, which have been used successfully on National Spherical Torus Experiment (NSTX), will also play an important role in ITER and are a promising candidate for the Fusion Nuclear Science Facility (FNSF) designs based on spherical torus (ST). Experimental studies of high harmonic fast waves (HHFW) heating on the NSTX have demonstrated that substantial HHFW power loss occurs along the open field lines in the scrape-off layer (SOL), but the mechanism behind the loss is not yet understood. The full wave RF code AORSA, in which the edge plasma beyond the last closed flux surface (LCFS) is included in the solution domain, is applied to specific NSTX discharges in order to predict the effects and possible causes of this power loss. In the studies discussed here, a collisional damping parameter has been implemented in AORSA as a proxy to represent the real, and most likely nonlinear, damping processes. A prediction for the NSTX Upgrade (NSTX-U) experiment, that will begin operation next year, is also presented, indicating a favorable condition for the experiment due to a wider evanescent region in edge density.*Research supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University.
Author: Abdul Hannan
Publisher:
ISBN: 9789175016924
Category :
Languages : en
Pages : 0
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Author: Jon Christian Rost
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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A population of suprathermal ions has been observed in the scrape-off layer during injection of power in the ion cyclotron frequency range on the Alcator C-Mod tokamak. These ions generated energetic neutrals measured with a charge-exchange neutral particle analyzer. In the hydrogen minority heating regime, fast particles were generated only when the injected power was above 500kW. Fast particles were observed at a low level of injected power when the frequency was a multiple of the ion cyclotron frequency in the scrape-off layer. The power deposited in the edge was always less than a few percent of the injected power and did not increase impurity levels. The theoretical threshold of parametric decay instabilities for decay of the pump wave in the antenna near field into an ion Bernstein wave and an ion cyclotron quasimode matches the observed threshold for fast ion production under a variety of conditions.
Author: United States. Energy Research and Development Administration
Publisher:
ISBN:
Category : Plasma heating
Languages : en
Pages : 164
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Author: J. E. Scharer
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Author: Francis W. Perkins
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Results from tokamak experiments on direct electron interaction with the compressional Alfven wave ({open_quote}fast wave{close_quote}) are reviewed. Experiments aimed at electron heating as well as those in which fast wave electron current drive was investigated are discussed. A distinction is drawn between experiments employing the lower hybrid range of frequencies, where both the lower hybrid wave ({open_quote}slow wave{close_quote}) and the fast wave can propagate in much of the plasma, and those experiments using the fast wave in the range of moderate to high ion cyclotron harmonics, where only the fast wave can penetrate to the plasma core. Most of the early tokamak experiments were in the lower hybrid frequency regime, and the observed electron interaction appeared to be very similar to that obtained with the slow wave at the same frequency. In particular, electron interaction with the fast wave was observed only below a density limit nearly the same as the well known slow wave density limit. In the more recent lower frequency fast wave experiments, electron interaction (heating and current drive) is observed at the center of the discharge, where slow waves are not present.
Author: Alcator Group
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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