An almost universal instability in high pressure plasmas is the Neoclassical
Tearing Mode (NTM). NTMs are driven by local perturbations in
the current density and result in magnetic island like deformations of the
magnetic topology. They can be stabilized by compensating the current
perturbations with local electron cyclotron resonance heating (ECRH) or
with non-inductive current drive (ECCD). The modified Rutherford equation
describes the nonlinear evolution of tearing modes as determined by
various contributions to the local current density pertubation. An extensive
investigation of the two terms representing the stabilizing effects from
ECRH and ECCD have been made resulting in accurate description of both
terms. The results of this model can now be compared to the experimental
observations. For this purpose, an extensive data set exists from the past
experiments on tearing mode stabilization by ECRH and ECCD on TEXTOR.
The properly benchmarked model can then be used to predict the
effectiveness of ECRH and ECCD for NTM stabilization on International
Thermonuclear Experimental Reactor (ITER). In addition, a number of
predictions on the effects of ECRH and ECCD on the growth of the NTM
have been made on the basis of crude approximations to the ECRH and
ECCD tems in the modified Rutherford equation. These predictions can
now be checked against the more accurate expressions obtained.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611044/index.pdf |
| Date | 01 September 2009 |
| Creators | Ayten, Bircan |
| Contributors | Bilikmen, Sinan |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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