Experimental Study of Reversed Shear Alfven Eigenmodes During The Current Ramp In The Alcator C-Mod Tokamak | |
Edlund, E. M. ; Porkolab, M. ; Kramer, G. J. ; Lin, L. ; Lin, Y. ; Tsuji, N. ; Wukitch, S. J. | |
Princeton University. Plasma Physics Laboratory. | |
关键词: Ions; Alcator Device; Magnetic Fields; Compressibility; 70 Plasma Physics And Fusion Technology; | |
DOI : 10.2172/988883 RP-ID : PPPL-4544 RP-ID : DE-AC02-09CH11466 RP-ID : 988883 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
Experiments conducted in the Alcator C-Mod tokamak at MIT have explored the physics of reversed shear Alfven eigenmodes (RSAEs) during the current ramp. The frequency evolution of the RSAEs throughout the current ramp provides a constraint on the evolution of qmin, a result which is important in transport modeling and for comparison with other diagnostics which directly measure the magnetic field line structure. Additionally, a scaling of the RSAE minimum frequency with the sound speed is used to derive a measure of the adiabatic index, a measure of the plasma compressibility. This scaling bounds the adiabatic index at 1.40 ± 0:15 used in MHD models and supports the kinetic calculation of separate electron and ion compressibilities with an ion adiabatic index close to 7~4.
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