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Development of advanced mini-channel cavity cooling systems for a 170 GHz, 2 MW coaxial cavity gyrotron

Kalaria, Parth C.; Brücker, Philipp Thomas; Ruess, Sebastian; Avramidis, Konstantinos A.; Gantenbein, Gerd; Illy, Stefan; Thumm, Manfred; Weggen, Jörg; Jelonnek, John

Abstract (englisch):
For Electron Cyclotron Heating and Current Drive (ECRH&CD) applications in fusion facilities, high-frequency (> 100 GHz), high-power (~ 1 – 2 MW) gyrotrons need to operate in long pulse regime (seconds to hours). In such conditions, the maximum heat-load on the wall of the interaction section is in the order of 2 kW/cm2, which is the major limiting technological factor for output power, efficiency and pulse-length of the tube. Considering long-pulse gyrotron operating, the thermal deformation due to cavity-wall heating also leads to a downshift of the gyrotron operating frequency [1]. Consequently, an effective cavity cooling system is a prerequisite to maintain the cavity temperature within material strength limits (e.g. 250°C for Glidcop). The ongoing gyrotron development demands a very effective cavity cooling system for stable and optimum gyrotron operation. Initially, the performance of the existing annular-gap cavity cooling system for the modular KIT 170 GHz, 2 MW coaxial cavity gyrotron were systematically studied in [2-3] and the simulation results suggest safe operation up to a pulse length of 150 ms. Hence, a very effective cavity cooling system is mandatory to increase the pulse-length and to improve gyrotron performance. ... mehr

Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Vortrag
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000097202
HGF-Programm 31.03.02 (POF III, LK 01)
Veranstaltung Workshop on RF Heating Technology of Fusion Plasmas (US-EU-JPN RF Heating Technology Workshop) (2019), Freiburg im Breisgau, Deutschland, 09.09.2019 – 12.09.2019
Projektinformation EUROfusion (EU, H2020, 633053)
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