Sherwood 2015

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approved2015paperabstract1.pdf2015-01-15 13:54:16Bruno Coppi

Origin of Non-diffusive Angular Momentum Transport and Spontaneous Rotation

Author: Bamandas Basu
Requested Type: Consider for Invited
Submitted: 2015-01-15 13:24:50

Co-authors: B.Coppi, P.Montag

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Abstract Text:
The “spontaneous rotation” of axisymmetric plasmas has been confirmed to be connected [1] to the excitation of modes involving the extraction of angular momentum from the plasma column and the recoil of the background plasma in the opposite direction. Since the observed radial profiles of the toroidal rotation velocity are consistent with a transport equation for the angular momentum that is not, in general, of the diffusive type [1], a theoretical model is introduced to identify the modes that can be excited and lead to the presence of an angular momentum “inflow” contrary to the direction of diffusion flow. The considered class of modes involves significant electron temperature fluctuations, as evidenced by the experiments. After analyzing several options, including that of the “tridimensional heating mode” [2], the mode found to be most suitable [3] is a development of the toroidal ion temperature gradient mode [4].


[1] B. Coppi, 2000 IAEA Int. Fus. En. Conf. (Vienna, 2000) Paper TH-P1/17; and Nucl. Fusion 42, (2002) 1.
[2] B. Coppi, “Tridimensional Heating Modes”, presented at Int. Sherwood Theory Mtg, San Diego, CA (2014).
[3] B. Coppi, B. Basu, P. Montag, L. Sugiyama, T. Zhou, and P. Buratti, Paper presented at the 2014 IAEA Int. Fus. En. Conf. (St. Petersburg, 2014) TH-P7/10; submitted to Nucl. Fusion.
[4] B. Coppi, M. N. Rosenbluth, and R. Z. Sagdeev, Phys. Fluids 10, (1967) 582.


March 16-18, 2015
The Courant Institute, New York University