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Title: The transport characteristics of passing fast ions produced by nonlocal overlapping of drift island surfaces and magnetic island surfaces

Abstract

The structure of the drift-island surface of passing fast ions (PFIs) is investigated in the presence of the resonant interaction with a magnetic island. Two overlapping regions of the drift-island surface and the magnetic island surface are found, one corresponding to local overlapping region and the other to non-local one. Here, the word “nonlocal” denotes that the resonances in the core plasma can have effects on the PFIs near the plasma boundary, while the “local” represents that the PFIs just near the resonant location are influenced. The nonlocal overlapping constructs a transport path along which the PFIs can become losses. There are three kinds of drift-island surfaces to join in forming the transport paths. A pitch angle region, which is called pitch angle gap, is found near the plasma boundary, where the drift-island surface cannot be formed and few PFIs are lost. The pitch-angle selective features of PFI losses are obtained by analyzing the three kinds of drift-island surfaces. The coupling between the crowd drift island surfaces and the collision can induce the prompt losses of PFIs and rapidly slowing down of PFI energy. The time of the prompt losses and the slowing down rate are calculated. Qualitatively, the theoreticalmore » results are in well agreement with the experimental observations in ASDEX Upgrade [M. García-Muñoz et al., Nucl. Fusion 47, L10 (2007)].« less

Authors:
; ; ;  [1];  [2]
  1. School of Nuclear Science and Technology, University of South China, Hengyang 421001 (China)
  2. School of Mathematics and Physics, University of South China, Hengyang 421001 (China)
Publication Date:
OSTI Identifier:
22599974
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASDEX TOKAMAK; INCLINATION; IONS; MAGNETIC ISLANDS; PITCHES; PLASMA; RESONANCE; SLOWING-DOWN; SURFACES; TRANSPORT THEORY

Citation Formats

Cao, Jinjia, Gong, Xueyu, E-mail: gongxueyu-usc@163.com, Xiang, Dong, Huang, Qianhong, and Yu, Jun. The transport characteristics of passing fast ions produced by nonlocal overlapping of drift island surfaces and magnetic island surfaces. United States: N. p., 2016. Web. doi:10.1063/1.4959868.
Cao, Jinjia, Gong, Xueyu, E-mail: gongxueyu-usc@163.com, Xiang, Dong, Huang, Qianhong, & Yu, Jun. The transport characteristics of passing fast ions produced by nonlocal overlapping of drift island surfaces and magnetic island surfaces. United States. doi:10.1063/1.4959868.
Cao, Jinjia, Gong, Xueyu, E-mail: gongxueyu-usc@163.com, Xiang, Dong, Huang, Qianhong, and Yu, Jun. Mon . "The transport characteristics of passing fast ions produced by nonlocal overlapping of drift island surfaces and magnetic island surfaces". United States. doi:10.1063/1.4959868.
@article{osti_22599974,
title = {The transport characteristics of passing fast ions produced by nonlocal overlapping of drift island surfaces and magnetic island surfaces},
author = {Cao, Jinjia and Gong, Xueyu, E-mail: gongxueyu-usc@163.com and Xiang, Dong and Huang, Qianhong and Yu, Jun},
abstractNote = {The structure of the drift-island surface of passing fast ions (PFIs) is investigated in the presence of the resonant interaction with a magnetic island. Two overlapping regions of the drift-island surface and the magnetic island surface are found, one corresponding to local overlapping region and the other to non-local one. Here, the word “nonlocal” denotes that the resonances in the core plasma can have effects on the PFIs near the plasma boundary, while the “local” represents that the PFIs just near the resonant location are influenced. The nonlocal overlapping constructs a transport path along which the PFIs can become losses. There are three kinds of drift-island surfaces to join in forming the transport paths. A pitch angle region, which is called pitch angle gap, is found near the plasma boundary, where the drift-island surface cannot be formed and few PFIs are lost. The pitch-angle selective features of PFI losses are obtained by analyzing the three kinds of drift-island surfaces. The coupling between the crowd drift island surfaces and the collision can induce the prompt losses of PFIs and rapidly slowing down of PFI energy. The time of the prompt losses and the slowing down rate are calculated. Qualitatively, the theoretical results are in well agreement with the experimental observations in ASDEX Upgrade [M. García-Muñoz et al., Nucl. Fusion 47, L10 (2007)].},
doi = {10.1063/1.4959868},
journal = {Physics of Plasmas},
number = 8,
volume = 23,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}