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Schemes for generating deeply trapped fast ions via ion-cyclotron-resonance heating in Wendelstein 7-X

C Slaby, H M Smith, J P Graves, S Lazerson2025年6月Plasma Physics and Controlled FusionIF 2.2出版社

Wendelstein 7-X (W7-X) is a large, superconducting, optimized stellarator being operated in Greifswald, Germany. One of the original optimization criteria (Grieger et al 1992 Phys. Fluids B: Plasma Physics4 2081) is good fast-ion confinement, mainly at increased plasma beta (Drevlak et al 2014 Nucl. Fusion54 073002). This optimization applies mostly to deeply trapped collisionless fast ions. However, it has been shown in the past (Lazerson et al 2024 Phys. Plasmas31 072506) that the current NBI system at W7-X does not populate these deeply trapped particle orbits in most magnetic configurations. Additionally, the maximum NBI injection energy is limited to in Hydrogen which makes the particles not sufficiently collisionless. On the other hand, generating fast ions with ion-cyclotron-resonance heating (ICRH) does not suffer from such an energy limitation. In principle, the ICRH system can also be more flexible in other regards: By choosing the ICRH frequency appropriately, the resonance can be shifted away from the usual region of high magnetic field strength and placed deliberately into a region of low field strength which favours the generation of deeply trapped fast ions. In this contribution we explore such ICRH schemes for generating deeply trapped fast ions in W7-X using the SCENIC code package (Jucker et al 2011 Comput. Phys. Commun.182 912). It is found that ideal target plasmas for proving the success of the optimization experimentally have a high temperature, the magnetic configuration should have a large magnetic mirror and the antenna frequency should be reduced from its nominal value to place the resonance in the triangular plane. Not all of these requirements are compatible with the systems as currently installed at W7-X and also detecting the fast ions may be an experimental challenge.

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wendelstein-7x高精度(タイトル一致)

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Fusion Advanced Studies TorusEnergetic ionWendelstein

AIによる論文要約

W7-Xでのイオン-サイクロトロン共鳴加熱によるエネルギーの高い閉じ込められたイオンの生成スキーム
JAこの論文は核融合研究者、特にW7-Xの実験や高速イオン物理に興味のある研究者に有益です。プラズマ加熱手段の多様化や高速イオン閉じ込めの最適化に関心のある学生にも役立つでしょう。#W7X #ICRH #FastIons #PlasmaHeating #ConfinementOptimization
LLM向け: {'Title': 'Schemes for generating deeply trapped fast ions via ion-cyclotron-res…

この論文はW7-Xでのイオン-サイクロトロン共鳴加熱(ICRH)を使って、深く閉じ込められた高エネルギーのイオンを生成する方法について探っています。W7-Xの最適化では高ベータプラズマでの高速イオンの閉じ込めが重要ですが、現在のNBIシステムではこれらの粒子を十分に生成できません。一方、ICRHではこの問題を回避できる可能性があり、適切な周波数設定により、低磁場領域でこれらの粒子を生成できると示唆されています。

Schemes for generating deeply trapped fast ions via ion-cyclotron-resonance heating in Wendelstein 7-X
ENThis paper is of interest to fusion researchers and engineers working on advanced plasma confinement devices like stellarators, as well as those studying fast ion generation and confinement using ICRH.#Stellarator #FastIons #ICRH #PlasmaPhysics
LLM向け: {'Title': 'Schemes for generating deeply trapped fast ions via ion-cyclotron-res…

This paper explores methods to generate deeply trapped fast ions in the Wendelstein 7-X (W7-X) stellarator using ion-cyclotron-resonance heating (ICRH). The authors find that ideal target plasmas require high temperature, large magnetic mirror, and reduced antenna frequency to place the resonance in the triangular plane, which may not be fully compatible with the current W7-X systems.

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