Ion Bernstein Wave Heating and Improved Confinement on the Alcator C Tokamak PDF Download
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Author: John D. Moody
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: John D. Moody
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: Paul Bonoli
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Category :
Languages : en
Pages : 42
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Author: John D. Moody
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Category :
Languages : en
Pages : 61
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Author: John D. Moody
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Category :
Languages : en
Pages : 440
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Author: D. W. Ignat
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Category :
Languages : en
Pages : 12
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Category : Ion acoustic waves
Languages : en
Pages : 34
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Author: Abhay Ram
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Category :
Languages : en
Pages : 10
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Author: Jon Christian Rost
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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: Eric Alan Nelson-Melby
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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(Cont.) The PCI system in C-Mod measures line-integrated density fluctuations using a CO2 laser which passes vertically through the plasma. The density fluctuation pattern is an inherently 3-dimensional structure, so the full-wave code TORIC has been used to interpret the one-dimensional measurements, which have some unexpected features, such as multiple peaks and troughs in amplitude. Strong IBW signal was often observed to the low-field side of the mode conversion layer. The importance of the parallel electric field for these IBW density fluctuation measurements is identified. IBW wavenumbers from 5 to 12 cm-1 have been detected, which is within the range of the code results.
Author: T. Watari
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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