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rmf_talk.pdf2011-08-16 19:21:55Richard Milroy
icc_paper.pdf2011-08-16 19:21:08Richard Milroy

A comparison of NIMROD simulations of RMF current drive with 3-axis probe data from the TCSU experiment

Author: Richard D. Milroy
Requested Type: Consider for Invited
Submitted: 2011-06-06 16:34:31

Co-authors: Katherine Velas

Contact Info:
PSI-Center and RPPL, University of Washington
120 AERB
Seattle, WA   98195-2
USA

Abstract Text:
The NIMROD code has been adapted to simulate the formation and sustainment of FRCs using Rotating Magnetic Fields (RMF) [1]. Calculations have been performed with the magnetic boundary conditions adjusted to match those of recent experimental measurements as closely as possible. First the n=0 flux on the radial wall is set to match that measured in the experiment, and secondly the n=1 fields imposed are made to approximate the boundary fields measured by the recently installed 3-axis probe.
The experimental measurements were made with a new 3-axis probe that was installed on TCSU shortly before its final shut-down. This probe has 90 windings that can simultaneously measure Br, Bθ, and Bz at 30 radial positions. The probe was axially translatable and was moved to multiple axial positions, allowing for a full r-z map of the magnetic field by taking multiple repeatable shots.
Both calculations and experiments were performed with both even-parity and odd-parity antenna sets. For both cases, a comparison of the steady n=0 component of the calculated field shows a very similar structure to that obtained with experimental measurements. It is interesting to note how closely the predicted character of the induced toroidal field matches the experimental measurements. Graphics showing the predicted full 3D magnetic field structure will be presented. It is hoped that future analysis will allow a similar map of the 3D field structure in the experiment to be inferred, and compared with numerical predictions.
[1] R.D. Milroy, C.C. Kim and C.R. Sovinec, "Extended magnetohydrodynamic simulations of field reversed configuration formation and sustainment with rotating magnetic field current drive", Phys. Plasmas, 17, 062502 (2010)

Characterization: A1,A7

Comments:

University of Washington

Workshop on Innovation in Fusion Science (ICC2011) and
US-Japan Workshop on Compact Torus Plasma
August 16-19, 2011
Seattle, Washington

ICC 2011