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Runaway positrons in magnetized plasmas

Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik) ; Gergely Papp (Institutionen för teknisk fysik, Nukleär teknik)
53rd Annual Meeting of the APS Division of Plasma Physics, Salt Lake City, Utah p. GO5.00015. (2011)
[Konferensbidrag, övrigt]

Runaway electron avalanches have been frequently observed in large tokamak disruptions. The energetic runaways produced in the avalanches may give rise to electron-positron pair production. It has been estimated that up to 10^{14} positrons may be created in collisions between runaway electrons and thermal particles in tokamak disruptions [1]. At birth, these positrons are highly relativistic, and either experience runaway acceleration or are thermalized in a few hundred milliseconds before being annihilated. In this work we calculate the distribution of positrons at birth and their subsequent fate in magnetized plasmas. The production rate is calculated by using a pair-production cross-section valid for arbitrary energies. [1] P. Helander and D. Ward, Phys. Rev. Lett., 90 135004-1 (2003).



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Denna post skapades 2012-01-04. Senast ändrad 2014-09-02.
CPL Pubid: 151703

 

Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Energi
Hållbar utveckling
Plasmafysik
Fusion

Chalmers infrastruktur