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

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:
OSTI Identifier:
1136903
Report Number(s):
PPPL--5021
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:
AC02-09CH11466
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)
Research Org:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC)
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