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EX / P 4-32 1 Mode Conversion , Current Drive and Flow Drive with High Power ICRF Waves in Alcator C-Mod : Experimental Measurements and Modeling
| Content Provider | Semantic Scholar |
|---|---|
| Author | Porkolab, Miklos Bonoli, Paul T. Lin, Lejing Lin, Yan-Xia Nelson-Melby, E. Parisot, Alexandre Rice, Jeremy Schilling Wright, John C. Wukitch, Stephen James |
| Copyright Year | 2004 |
| Abstract | Recent results from high power ion cyclotron heating experiments (ICRF) in the Alcator C-Mod tokamak are reported. In particular, mode converted waves in the vicinity of the ion-ion hybrid layer have been measured by means of Phase Contrast Imaging techniques (PCI). The measured k-spectrum and spatial location of the waves is in agreement with theoretical predictions as well as with the full-wave TORIC code modeling results. For appropriate ion species (i.e., H-He3 in C-Mod, which is equivalent to DT in ITER), in tokamak geometry mode-conversion of the fast magnetosonic wave into the electromagnetic ion cyclotron waves (ICW) dominates over ion Bernstein waves (IBW). The waves propagate back toward the antenna on the low field side, in contrast to what is expected for IBW wave propagation. Experimental verification of such code predictions is essential for reliable predictive capability in future burning plasma experiments (ITER). In agreement with experimental observations, the TORIC results verify that the RF power is mainly converted to the ICW rather than IBW under most scenarios, ie H(He) and D(He). Associated with the electron Landau absorption of the mode converted waves, we are predicting mode conversion current drive of the order of 100 kA at 3 MW RF power using the new improved 4-strap antenna at 90° phasing, centered at Nφ = 7. These experiments are in progress. Initial results indicate significant modification of the sawtooth period by such techniques. In addition, flow drive experiments are being carried out with the aim of flow stabilization of turbulence, but the results to date are inconclusive. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www-pub.iaea.org/MTCD/Meetings/PDFplus/fusion-20-preprints/EX_P4-32.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
