Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device
- Nagoya Univ., Nagoya (Japan)
- Nagoya Univ., Nagoya (Japan); National Inst. for Fusion Science, Toki (Japan)
- National Inst. for Fusion Science, Toki (Japan)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Plasma heating and current drive with Electron Cyclotron Waves (ECWs) require precise control over the polarization state of ECWs to ensure that the entire input power is deposited where intended. However, due to the magnetic shear in the peripheral plasma, the polarization state can change. This effect is particularly pronounced in the Large Helical Device (LHD), where the magnetic field is sheared strongly. Here, we present a new code PARADE (PAraxial RAy DEscription) that can simulate the evolution of the polarization state along the beam propagation without resorting to full-wave modeling. We apply PARADE to the LHD plasma and simulate the evolution of the beam transverse structure, including the local amplitudes of the two electromagnetic eigenmodes. Here, the results surpass those yielded by the code LHDGauss used in the past. Based on these new results, we discuss how to improve the mode purity of ECWs by controlling the initial polarization state. A remarkable improvement is predicted numerically.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- This work is supported by NIFS ULRR027 and NIFS collaboration programs KLER056.
- Grant/Contract Number:
- AC02-09CH11466
- OSTI ID:
- 1558750
- Journal Information:
- Plasma and Fusion Research, Vol. 14, Issue 0; ISSN 1880-6821
- Publisher:
- Japan Society of Plasma Science and Nuclear Fusion ResearchCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Quasioptical modeling of wave beams with and without mode conversion. II. Numerical simulations of single-mode beams
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journal | July 2019 |
Quasioptical modeling of wave beams with and without mode conversion. III. Numerical simulations of mode-converting beams
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journal | July 2019 |
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