منابع مشابه
Runaway positrons in fusion plasmas.
Runaway positrons can be produced in the presence of runaway electron avalanches in magnetized plasmas. In this Letter, we determine the positron distribution, the fraction of runaway positrons, and the parametric dependences of their synchrotron radiation spectrum. We show that the maximum production occurs around γ(e)≃30, where γ(e) is the Lorentz factor of the fast electrons. For an avalanch...
متن کاملSynchrotron Radiation from Runaway Electrons in Plasmas
Highly relativistic runaway electrons are of great concern in the area of fusion energy research, since their presence in tokamak plasmas have the potential to hinder the successful and stable operation of the device, and potentially cause severe structural damage. In this thesis, runaway electron generation dynamics is investigated using the newly developed efficient computational tool CODE. A...
متن کاملRunaway expansion in magnetically confined electron plasmas
Magnetic confinement of neutral plasmas in a tokamak is one of the most promising avenues for generating power via nuclear fusion. Plasma disruption and energy loss, however, continue to cause problems even as larger experimental plants are being built. In particular, cyclical disruption of the plasma’s core electron temperature is a persistent but poorly explained phenomenon. In this paper, I ...
متن کاملPositron creation and annihilation in tokamak plasmas with runaway electrons.
It is shown that electron-positron pair production is expected to occur in post-disruption plasmas in large tokamaks, including JET and JT-60U, where up to about 10(14) positrons may be created in collisions between multi-MeV runaway electrons and thermal particles. If the loop voltage is large enough, they are accelerated and form a beam of long-lived runaway positrons in the direction opposit...
متن کاملDynamics Of Fusion in Plasmas
We investigate the possibility of gaining energy from nuclear fusion reactions using different mixtures of D, T and Li. First, a plasma in equilibrium is studied at different densities and temperatures. In a second, highly non equilibrium case, the plasma is at high densities and excitation energies. While the first case could lead to an energy gain especially when coupled to an accelerator, in...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2012
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.108.225003