What is the fate of runaway positrons in tokamaks?

Jian Liu, Hong Qin, Nathaniel J. Fisch, Qian Teng, Xiaogang Wang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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.

Original languageEnglish (US)
Article number064503
JournalPhysics of Plasmas
Issue number6
StatePublished - Jun 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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