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Abstract: I will discuss a new method for calculating transport quantities, such as thecharged particle stopping power, in a weakly to moderately coupled plasma. Thismethod, called dimensional continuation, lies within the framework ofconvergent kinetic equations, and it is powerful enough to allow for systematicperturbative expansions in the plasma coupling constant. In particular, itprovides an exact evaluation of the stopping power to leading andnext-to-leading order in the plasma coupling, with the systematic error beingof cubic order. Consequently, the calculation is near-exact for a weaklycoupled plasma, and quite accurate for a moderately coupled plasma. The leadingorder term in this expansion has been known since the classic work of Spitzer.In contrast, the next-to-leading order term has been calculated only recentlyby Brown, Preston, and Singleton BPS, using the aforementioned method, toaccount for all short- and long-distance physics accurate to second order inthe plasma coupling, including an exact treatment of the quantum-to-classicalscattering transition. Preliminary numerical studies suggest that the BPSstopping power increases the ignition threshold, thereby having potentialadverse implications for upcoming high energy density facilities. Since the keyideas behind the BPS calculation are possibly unfamiliar to plasma physicists,and the implications might be important, I will use this opportunity to explainthe method in a pedagogical fashion.



Autor: Robert L. Singleton Jr

Fuente: https://arxiv.org/







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