Losses of runaway electrons in MHD-active plasmas of the COMPASS tokamak

Ficker, O.; Mlynář, J.; Vlainic, M.; Čeřovský, J.; Urbán, J.; Vondráček, P.; Weinzettl, V.; Macúšová, E.; Decker, J.; Gospodarczyk, M.; Martin, P.; Nardon, E.; Papp, G.; Plyusnin, Victor F.; Reux, C.; Saint‐Laurent, F.; Sommariva, C.; Cavalier, J.; Havlíček, Jan; Havránek, A.; Hronova, O.; Imríšek, M.; Markovič, T.; Varju, J.; Paprok, R.; Pánek, R.; Hron, M.; Team, Compass

doi:10.1088/1741-4326/aa6aba

Cited by 21 publications

(40 citation statements)

References 17 publications

(24 reference statements)

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“…(center) TCV controlled ramp-down with (#61503, also with current oscillations) and without (#61501) the REB-C that is used to obtain (right) a large RE beam vertical displacement of about 11 cm, shot #61096. 16 Similar results where electrical field oscillations have induced RE losses have been discussed in [21] and [4].…”

Section: Position Controlsupporting

confidence: 57%

Runaway electron beam control

Carnevale¹,

Ariola²,

Artaserse³

et al. 2018

Plasma Phys. Control. Fusion

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Section: Position Controlsupporting

confidence: 57%

Runaway electron beam control

Carnevale¹,

Ariola²,

Artaserse³

et al. 2018

Plasma Phys. Control. Fusion

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“…The first spectrogram shows magnetic activity of the plasma which affects the RE radiation, which can be seen in the second spectrogram. Similar correlations have been previously seen at the COMPASS tokamak between the HXR intensity and magnetic activity of the plasma [19]. Periodic oscillations, such as in shot 21213, have been discovered in almost all SXR signals, including shots from the 11th RE campaign.…”

Section: Jinst 17 P02030supporting

confidence: 81%

Detection of runaway electrons at the COMPASS tokamak using a Timepix3-based semiconductor detector

Kulkov¹,

Marčišovský²,

Švihra³

et al. 2022

J. Inst.

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Runaway electrons are considered dangerous for the integrity of tokamak vacuum vessels. To secure the success of the future tokamak-based machines, reliable diagnostics and mitigation strategies are necessary. The COMPASS tokamak supported the research of runaway electron physics via regular experimental campaigns. During the last two experimental campaigns dedicated to runaway electrons, a semiconductor detector with a Timepix3 readout chip, Si sensor, and the SPIDR readout system was tested. Time evolution signals, energy measurements, and sensor snapshots collected with the Timepix3-based detector are presented.

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“…That dependence was observed, e.g., during experimental campaigns dedicated to studies of the RE emission at the COMPASS tokamak. It was observed that RE in the COMPASS can be produced due to two circumstances: very quiescent discharges performed at a low plasma density, or in the case when the plasma current disruption is initiated by the massive gas injection (MGI) [4]. The MHD instabilities are able to induce a modulation of the RE losses, as it was observed in the COMPASS and other tokamaks, e.g.…”

Section: Introductionmentioning

confidence: 93%

“…That puffing was usually performed during the current ramp-up phase, and it initiated a disruption. It made possible to perform experiments on the RE control and mitigation [4,12]. The measurements carried out by means of the Cherenkov probe showed that the first fast-electron peak appears usually at the current ramp-up phase, even before the hard X-rays (HXR) pulse.…”

Section: Measurements Of Fast Electronsmentioning

confidence: 99%

Development of a Cherenkov-type diagnostic system to study runaway electrons within the COMPASS tokamak

et al. 2017

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A: Direct measurements of fast electrons, which are produced in high-temperature plasma and escape from tokamak-type facilities, are of particular interest for ITER and future fusion devices, where intense runaway electrons (RE) can significantly damage the first wall components. Therefore, the runaway control and mitigation based on credible measuring methods should be developed already in present devices. A team from the National Centre for Nuclear Research (NCBJ), Poland, developed special probes equipped with Cherenkov-type detectors for measurements of the fast electrons within edge plasmas of tokamaks. Studies of the fast runaway electrons were extensively carried out at the COMPASS tokamak at the Institute of Plasma Physics (IPP) in Prague during experimental campaigns in 2014-2016. In order to investigate an electron-beam energy distribution a three-channel probe equipped with the Cherenkov-type detectors sensitive to electrons of different energies has been constructed. The measurements performed by means of these detectors showed that the first fast electron peak appears usually in the current ramp-up phase, even before the hard Xrays (HXR) pulse. Some electron signals can also be observed during subsequent HXR emissions. However, the most distinct electron peaks in all energy channels appear mainly during the plasma disruption. A correlation of Cherenkov signals with the MHD activity was also studied. K: Nuclear instruments and methods for hot plasma diagnostics; Plasma diagnosticsprobes 1Corresponding author.

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Losses of runaway electrons in MHD-active plasmas of the COMPASS tokamak

Cited by 21 publications

References 17 publications

Runaway electron beam control

Runaway electron beam control

Detection of runaway electrons at the COMPASS tokamak using a Timepix3-based semiconductor detector

Development of a Cherenkov-type diagnostic system to study runaway electrons within the COMPASS tokamak

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