CW Experiments With the EU 1-MW, 170-GHz Industrial Prototype Gyrotron for ITER at KIT

Ioannidis, Zisis C.; Rzesnicki, T.; Albajar, F.; Alberti, S.; Avramidis, Konstantinos A.; Bin, W.; Bonicelli, T.; Bruschi, A.; Chelis, Ioannis; Frigot, Pierre-Etienne; Gantenbein, G.; Hermann, V.; Hogge, J.‐P.; Illy, S.; Jin, Jianbo; Jelonnek, John; Kasparek, W.; Latsas, George P.; Lechte, C.; Legrand, François; Kobarg, T.; Pagonakis, I.; Rozier, Y.; Schlatter, Christian; Schmid, Martin; Tigelis, I. G.; Thumm, M.; Tran, M. Q.; Zein, A.; Zisis, A.

doi:10.1109/ted.2017.2730242

Cited by 22 publications

(20 citation statements)

References 11 publications

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“…Herein we summarize the latest experimental results with the CW industrial prototype gyrotron at KIT and SPC. A detailed description of the results achieved at KIT is presented in [6]. The experiments at SPC are still ongoing.…”

Section: Industrial Cw Prototypementioning

confidence: 99%

Report of recent experiments with the European 1 MW, 170 GHz CW and SP prototype gyrotrons for ITER

et al. 2019

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The European 1 MW, 170 GHz industrial CW prototype gyrotron has been designed within EGYC (European GYrotron Consortium) in collaboration with the industrial partner Thales Electron Devices (TED) and under the coordination of Fusion for Energy (F4E). This is a conventional (hollow) cavity gyrotron that is based on the 1 MW, 170 GHz short-pulse (SP) modular gyrotron, which has been designed and manufactured by KIT in collaboration with TED. The SP prototype has been tested in multiple experimental campaigns since 2015 and the nominal cavity mode TE32,9 is exited at 170.1 GHz, producing RF power above 1 MW with 35 % interaction efficiency. The first phase of the experiments with the CW industrial gyrotron was successfully completed at KIT in 2016, verifying most of the ITER specifications. Short pulses (<10ms) deliver RF power higher than 0.9 MW with a total efficiency of 26 % (in non-depressed collector operation). The Gaussian mode content of the RF beam is 97 %. Pulses with duration of 180 s (limited by the high-voltage power supply at KIT) produce power more than 0.8 MW with maximum efficiency 38 % (in depressed collector operation). In this work the achievements with the SP and the CW prototype gyrotrons are summarized.

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Section: Industrial Cw Prototypementioning

confidence: 99%

Report of recent experiments with the European 1 MW, 170 GHz CW and SP prototype gyrotrons for ITER

et al. 2019

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“…In particular when the SP gyrotron is operated with the optimal parameters in terms of output power, no parasitic signals can be detected by the diagnostics. Similarly, during the CW experiments at KIT there were only a few cases where parasitic signals could be marginally detected during the first ms of the long pulses [7]. However, considering that the demand for output power is constantly increasing, it is beneficial to be able to operate with much higher beam currents, while suppressing the possibility to excite spurious oscillation in the beam-tunnel area.…”

Section: Fully Metallic Beam-tunnelmentioning

confidence: 99%

Recent experiments with the European 1MW, 170GHz industrial CW and short-pulse gyrotrons for ITER

Ioannidis

Albajar

Alberti

et al. 2019

Fusion Engineering and Design

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The European Gyrotron Consortium (EGYC) is developing the European 1 MW, 170 GHz Continuous Wave (CW) industrial prototype gyrotron for ITER in cooperation with Thales Electron Devices (TED) and Fusion for Energy (F4E). This conventional, hollow-cavity gyrotron, is based on the 1 MW, 170 GHz Short-Pulse (SP) modular gyrotron that has been designed and manufactured by the Karlsruhe Institute of Technology (KIT) in collaboration with TED. Both gyrotrons have been tested successfully in multiple experiments. In this work we briefly report on the results with the CW gyrotron at KIT and we focus at the experiments at the Swiss Plasma Center (SPC). In addition, we present preliminary results from various upgrades of the SP tube that are currently tested at KIT.

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“…To address the third requirement, the upgraded gyrotron should be based on already proven long-pulse gyrotron designs and the deviation from these designs must be as small as possible. With respect to this, the European TE 28,8 -mode 140 GHz, 1 MW CW gyrotron for W7-X [5] and the European TE 32,9 -mode 170 GHz, 1 MW CW gyrotron for ITER [6] have been considered as starting points.…”

Section: Operating Mode Selectionmentioning

confidence: 99%

“…This implies that the upgraded gyrotron could use practically the same cathode and beam tunnel as those of the existing W7-X gyrotron. However, this would not be the case if the existing 170 GHz TE 32,9 -mode gyrotron for ITER, which uses a beam radius of 9.44 mm [6], was used as starting point. According to Table 1, the required beam radius for the upgraded gyrotron would then be significantly larger (11.4 mm); thus, a significantly different cathode and beam tunnel should probably be used for the upgraded gyrotron.…”

Section: Operating Mode Selectionmentioning

confidence: 99%

Studies towards an upgraded 1.5 MW gyrotron for W7-X

et al. 2019

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Studies towards a 1.5 MW, 140 GHz CW gyrotron, with the capability of MW-class operation also at 175 GHz, are ongoing at Karlsruhe Institute of Technology in view of a possible future upgrade of the ECRH system of the stellarator W7-X. The upgrade of the existing 1.0 MW, 140 GHz European gyrotron for W7-X has been chosen as a development path. Detailed designs of the cavity, the non-linear uptaper, and the quasi-optical launcher for the upgraded gyrotron have been obtained and have been validated numerically. In parallel, a mode generator, intended for low-power tests of the quasi-optical mode converter system of the upgraded gyrotron, has been designed, manufactured, and successfully tested.

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CW Experiments With the EU 1-MW, 170-GHz Industrial Prototype Gyrotron for ITER at KIT

Cited by 22 publications

References 11 publications

Report of recent experiments with the European 1 MW, 170 GHz CW and SP prototype gyrotrons for ITER

Report of recent experiments with the European 1 MW, 170 GHz CW and SP prototype gyrotrons for ITER

Recent experiments with the European 1MW, 170GHz industrial CW and short-pulse gyrotrons for ITER

Studies towards an upgraded 1.5 MW gyrotron for W7-X

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