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Title: What is the fate of runaway positrons in tokamaks?

Abstract

In this study, massive runaway positrons are generated by runaway electrons in tokamaks. The fate of these positrons encodes valuable information about the runaway dynamics. The phase space dynamics of a runaway position is investigated using a Lagrangian that incorporates the tokamak geometry, loop voltage, radiation and collisional effects. It is found numerically that runaway positrons will drift out of the plasma to annihilate on the first wall, with an in-plasma annihilation possibility less than 0.1%. The dynamics of runaway positrons provides signatures that can be observed as diagnostic tools.

Authors:
 [1];  [2];  [3];  [3];  [4]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Univ. of Science and Technology of China, Hefei (China); Princeton Univ., Princeton, NJ (United States)
  3. Princeton Univ., Princeton, NJ (United States)
  4. Peking Univ., Beijing (China)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1136903
Report Number(s):
PPPL-5021
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; POSITRONS; ELECTRIC FIELDS; MAGNETIC FIELDS; positrons; Tokamaks; electric fields; plasma dynamics; magnetic fields

Citation Formats

Liu, Jian, Qin, Hong, Fisch, Nathaniel J., Teng, Qian, and Wang, Xiaogang. What is the fate of runaway positrons in tokamaks?. United States: N. p., 2014. Web. doi:10.1063/1.4882435.
Liu, Jian, Qin, Hong, Fisch, Nathaniel J., Teng, Qian, & Wang, Xiaogang. What is the fate of runaway positrons in tokamaks?. United States. https://doi.org/10.1063/1.4882435
Liu, Jian, Qin, Hong, Fisch, Nathaniel J., Teng, Qian, and Wang, Xiaogang. Thu . "What is the fate of runaway positrons in tokamaks?". United States. https://doi.org/10.1063/1.4882435. https://www.osti.gov/servlets/purl/1136903.
@article{osti_1136903,
title = {What is the fate of runaway positrons in tokamaks?},
author = {Liu, Jian and Qin, Hong and Fisch, Nathaniel J. and Teng, Qian and Wang, Xiaogang},
abstractNote = {In this study, massive runaway positrons are generated by runaway electrons in tokamaks. The fate of these positrons encodes valuable information about the runaway dynamics. The phase space dynamics of a runaway position is investigated using a Lagrangian that incorporates the tokamak geometry, loop voltage, radiation and collisional effects. It is found numerically that runaway positrons will drift out of the plasma to annihilate on the first wall, with an in-plasma annihilation possibility less than 0.1%. The dynamics of runaway positrons provides signatures that can be observed as diagnostic tools.},
doi = {10.1063/1.4882435},
journal = {Physics of Plasmas},
number = 6,
volume = 21,
place = {United States},
year = {Thu Jun 19 00:00:00 EDT 2014},
month = {Thu Jun 19 00:00:00 EDT 2014}
}

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Cited by: 12 works
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Works referencing / citing this record:

Explicit symplectic algorithms based on generating functions for charged particle dynamics
journal, July 2016