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Basic design considerations for a frequency-tunable ECRH&CD system to suppress NTMs in DEMO

Wu, Chuanren ORCID iD icon; Avramidis, Konstantinos A.; Bruschi, Alessandro; Fable, Emiliano; Franke, Thomas; Gantenbein, Gerd; Garavaglia, Saul; Granucci, Gustavo; Illy, Stefan; Janky, Filip; Jelonnek, John; Kudlacek, Ondrej; Moro, Alessandro; Poli, Emanuele; Schramm, Raphael; Siccinio, Mattia; Snicker, Antti; Suárez López, Guillermo; Tardini, Giovanni; ... mehr

Abstract (englisch):

To take full advantage of the electron cyclotron resonance heating and current drive (ECRH&CD) system, flexible variation of the resonant (absorption) location is required. Electron cyclotron (EC) waves are used, among other tasks, to drive non-inductive plasma current in the O-point of magnetic islands for neo-classical tearing mode (NTM) stabilization. Typically, the location of absorption is varied by tuning the launching angle of the EC wave beam with movable plasma facing mirrors. Another possibility to achieve the variation of the absorption position is to tune the frequency of the EC waves, while keeping the wave launching angle constant.
Gyrotrons are the high-power microwave sources of any EC system. The oscillation frequency of a frequency-tunable gyrotron is changed in steps over a wide frequency range by changing the operating mode. The minimum frequency step between two neighboring modes and the number of steps define the bandwidth, while the tuning speed of the gyrotron super-conducting magnet is limited. These are the additional parameters to be considered in a frequency-steering EC system.
A feasibility study of using frequency-tunable EC wave beams for the NTM suppression in the current EU-DEMO baseline is performed with the transport code ASTRA and the beam tracing code TORBEAM. ... mehr

Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Vortrag
Publikationsdatum 21.09.2020
Sprache Englisch
Identifikator KITopen-ID: 1000124470
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Veranstaltung 31st Symposium on Fusion Technology (SOFT 2020), Online, 20.09.2020 – 25.09.2020
Projektinformation EUROfusion (EU, H2020, 633053)
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