April 15-17

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approvedbrennan_sherwood_19.pdf2019-02-22 15:30:35Dylan Brennan

Abstracts

Author: Dylan P. Brennan
Requested Type: Poster
Submitted: 2019-02-22 15:27:59

Co-authors: A.J. Cole, C. Akcay, and J.M. Finn

Contact Info:
Princeton University / PPPL
100 Stellarator Road
Princeton, NJ   08540
USA

Abstract Text:
The stability boundaries of a reduced model of a tokamak in beta vs omega, the ratio of thermal to magnetic energy vs the toroidal rotation frequency, are examined as the rotation varies across the Hall, Semi-Collisional and Inertial regimes, with a resistive wall included. A numerical solver for the two fluid layer response is presented, which solves the plasma layer response smoothly across these two fluid regimes. The equilibria are stable for low beta, and the marginal stability values in beta and rotation are computed. The results show the Semi-Collisional regime to be most relevant to DIII-D experimental analysis, and the lowest limiting beta. The stability boundary is non-monotonic in omega, and extends to lower beta as the finite frequency of the plasma response approaches the rotational frequency. A comparison is made between the analytic limits in each two fluid regime and the numerical solution to the plasma layer, showing significant deviation between the two over what is typically considered each two fluid regime. The impact of the rotation in both the plasma layer responses is used to interpret recent experimental results from DIII-D. Plans for including the effects of energetic ion interaction are discussed, which will be included as the numerical model becomes verified.

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