A Possible Excitation Mechanism for Observed Superthermal Ion Cyclotron Emission from Tokamak Plasmas PDF Download
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Author: R. O. Dendy
Publisher:
ISBN:
Category : Cyclotron resonance
Languages : en
Pages : 23
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Author: R. O. Dendy
Publisher:
ISBN:
Category : Cyclotron resonance
Languages : en
Pages : 23
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Book Description
Author:
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Category :
Languages : en
Pages :
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The spectrum of ion cyclotron emission (ICE) observed in tokamak experiments shows narrow peaks at multiples of the edge cyclotron frequency of background ions. A possible mechanism of ICE based on the fast Alfven Cyclotron Instability (ACI) resonantly excited by high energy charged products ([alpha]-particles or protons) is studied here. The two-dimensional ACI eigenmode structure and eigenfrequency are obtained in the large tokamak aspect ratio limit. The ACI is excited via wave-particle resonances in phase space by tapping the fast ion velocity space free energy. The instability growth rates are computed perturbatively from the perturbed fast particle distribution function, which is obtained by integrating the high frequency gyrokinetic equation along the particle orbit. Numerical examples of ACI growth rates are presented for TFTR plasmas. The fast ion distribution function is assumed to be singular in pitch angle near the plasma edge. The results are employed to understand the ICE in Deuterium-Deuterium (DD) and Deuterium-tritium (DT) tokamak experiments.
Author: International Workshop on Acceleration and Radiation Generation in Space and Laboratory Plasmas
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 172
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Category :
Languages : en
Pages : 56
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Author:
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ISBN:
Category : Physics
Languages : en
Pages : 1334
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Author:
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Category :
Languages : en
Pages :
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Two-dimensional solutions of compressional Alfven eigenmodes (CAE) are studied in the cold plasma approximation. For finite inverse aspect ratio tokamak plasmas the two-dimensional eigenmode envelope is localized at the low magnetic field side with the radial and poloidal localization on the order of a/[radical]m and a/(fourth root of m), respectively, where m is the dominant poloidal mode number. Charged fusion product driven Alfven Cyclotron Instability (ACI) of the compressional Alfven eigenmodes provides the explanation for the ion cyclotron emission (ICE) spectrum observed in tokamak experiments. The ACI is excited by fast charged fusion products via Doppler shifted cyclotron wave-particle resonances. The ion cyclotron and electron Landau dampings and fast particle instability drive are calculated perturbatively for deuterium-deuterium (DD) and deuterium-tritium (DT) plasmas. Near the plasma edge at the low field side the velocity distribution function of charged fusion products is localized in both pitch angle and velocity. The poloidal localization of the eigenmode enhances the ACI growth rates by a factor of[radical]m in comparison with the previous results without poloidal envelope. The thermal ion cyclotron damping determines that only modes with eigenfrequencies at multiples of the edge cyclotron frequency of the background ions can be easily excited and form an ICE spectrum similar to the experimental observations. Theoretical understanding is given for the results of TFTR DD and DT experiments with[upsilon][sub[alpha]0]/[upsilon][sub A]1 and JET experiments with[upsilon][sub[alpha]0]/[upsilon][sub A] 1.
Author: Sherrie Anne Preische
Publisher:
ISBN:
Category : Imaging systems
Languages : en
Pages : 19
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ISBN:
Category :
Languages : en
Pages : 618
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Author: R. O. Dendy
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Arthur James Wells
Publisher:
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Category : Bibliography, National
Languages : en
Pages : 2000
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