Development in Russia of high-power gyrotrons for fusion

Денисов, Г. Г.; Litvak, A. G.; Myasnikov, V.E.; Tai, E. M.; Zapevalov, V. E.

doi:10.1088/0029-5515/48/5/054007

Cited by 94 publications

(62 citation statements)

References 9 publications

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“…It is assumed that the introduction of so-called multi-stage depressed collectors (MSDC) will allow efficiencies above 60% whereas the target for ITER is 50% currently. Additionally, a high reliability is also required (98% [tbc], 95% demonstrated for Russian ITER gyrotron [11]) to guarantee the power delivered to the plasma. An estimate of total number of units required has been done using binomial distribution for the calculation of the probability.…”

Section: Input To the Conceptual Design Of The Gyrotronmentioning

confidence: 99%

Preliminary conceptual design of DEMO EC system

Garavaglia

Bin

Bruschi

et al. 2015

AIP Conference Proceedings

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Section: Input To the Conceptual Design Of The Gyrotronmentioning

confidence: 99%

Preliminary conceptual design of DEMO EC system

Garavaglia

Bin

Bruschi

et al. 2015

AIP Conference Proceedings

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“…The new units are capable of 2-frequency operation (2nd frequency 105 GHz) and the new launchers can be rotated fast around one axis during a discharge for the purpose of MHD-control [1]. One of the units will be extended with two additional intermediate frequencies as soon as the corresponding vaccuum-window issues are solved [2]. Additionally the initial ECRH system with 4 units with 0.5 MW / 2 s pulses at 140 GHz is still available.…”

Section: Introductionmentioning

confidence: 99%

High power ECRH and ECCD in moderately collisional ASDEX Upgrade Hmodes and status of EC system upgrade

Stober

Sommer

Angioni

et al. 2015

EPJ Web of Conferences

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Abstract. This contribution deals with H-modes with significant heat exchange between electrons and ions, but which can still show large differences between electron and ion-temperatures especially inside half minor radius. These conditions are referred to as moderately collisional. A systematic study shows that an increasing fraction of electron heating increases the transport in the ion channel mainly due to the dependence of the ITG dominated ion transport on the ratio T e /T i in agreement with modeling. The rotational shear in the plasmas under study was so small that it hardly influences ITG stability, such that variations of the rotation profile due to a change of the heating method were of minor importance. These findings connect to studies of advanced tokamak scenarios using ECCD as a tool to modify the q-profile. The electron heating connected to the ECCD tends to increase the transport in the ion channel quite in contrast to the goal to operate at reduced current but with increased confinement. The confinement only increases as the fraction of ion heating is increased by adding more NBI. An ITER case was modeled as well. Due to the larger value of ν ei · τ E the ratio T e /T i is only moderately reduced even with strong electron heating and the confinement reduction is small even for the hypothetic case of using only ECRH as additional heating. Finally the paper discusses the ongoing upgrade of the AUG ECRH-system.

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“…These gyrotrons were used in some tokamak devices such as JT-60U [2], DIII-D [3] and ASDEX-U [4]. Recently, long-pulse oscillations of several hundreds of seconds at an output power of 1 MW have been demonstrated at the frequencies of 140 GHz for W7-X [5] and 170 GHz for ITER [6,7]. At the lower frequencies, where diffraction loss in the gyrotron tends to be larger than that at the higher frequencies due to increase in a diffraction effect, long-pulse gyrotrons are under development [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Development of a dual frequency (110/138 GHz) gyrotron for JT-60SA and its extension to an oscillation at 82 GHz

Kobayashia

Moriyama

Isayama

et al. 2015

EPJ Web of Conferences

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Abstract.A dual-frequency gyrotron, which can generate 110 GHz and 138 GHz waves independently, is being developed in JAEA to enable electron cyclotron heating (ECH) and current drive (ECCD) in a wider range of plasma discharge conditions of JT-60SA. Conditioning operation of the gyrotron toward 1 MW for 100 s, which is the target output power and pulse length for JT-60SA, is in progress without significant problems. Oscillations of 1 MW for 10 s and 0.5 MW for 198 s were obtained, so far, at both frequencies. Cooling water temperatures in the gyrotron and matching optics unit were saturated in the 198 s oscillation, and the observed maximum water temperature is sufficiently low. In addition to the above activity on the dualfrequency gyrotron development, an oscillation (0.3 MW for 20 ms) at 82 GHz was demonstrated as an additional frequency of the dual-frequency gyrotron. A possibility of the use of fundamental harmonic wave at 82 GHz in JT-60SA has been shown.

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Development in Russia of high-power gyrotrons for fusion

Abstract: The paper presents the latest development achievements in Russian institutions IAP/GYCOM of MW power level gyrotrons for fusion installations.

Cited by 94 publications

References 9 publications

Preliminary conceptual design of DEMO EC system

Preliminary conceptual design of DEMO EC system

High power ECRH and ECCD in moderately collisional ASDEX Upgrade Hmodes and status of EC system upgrade

Development of a dual frequency (110/138 GHz) gyrotron for JT-60SA and its extension to an oscillation at 82 GHz

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