Experimental Runaway Electron Current Estimation in COMPASS Tokamak
TLDR
In this paper, the authors present an implementation of runaway electron current estimations at COMPASS tokamak, which uses a theoretical method developed by Fujita et al., with the difference in using experimental measurements from EFIT and Thomson scattering.Abstract:
Runaway electrons present a potential threat to the safe operation of future nuclear fusion large facilities based on the tokamak principle (e.g., ITER). The article presents an implementation of runaway electron current estimations at COMPASS tokamak. The method uses a theoretical method developed by Fujita et al., with the difference in using experimental measurements from EFIT and Thomson scattering. The procedure was explained on the COMPASS discharge number 7298, which has a significant runaway electron population. Here, it was found that at least 4 kA of the plasma current is driven by the runaway electrons. Next, the method aws used on the set of plasma discharges with the variable electron plasma density. The difference in the plasma current was explained by runaway electrons, and their current was estimated using the aforementioned method. The experimental results are compared with the theory and simulation. The comparison presented some disagreements, showing the possible direction for the code development. Additional application on runaway electron energy limit is also addressed.read more
Citations
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Runaway electron beam stability and decay in COMPASS
Ondrej Ficker,Eva Macusova,Jan Mlynar,David Bren,A. Casolari,J. Cerovsky,M. Farnik,O. Grover,Josef Havlicek,A. Havranek,Martin Hron,Martin Imrisek,M. Jerab,J. Krbec,Petr Kulhánek,Vladimír Linhart,M. Marcisovsky,Tomas Markovic,D. Naydenkova,Radomir Panek,M. Sos,Peter Svihra,V. Svoboda,M. Tomes,Jakub Urban,Jozef Varju,M. Vlainic,Petr Vondracek,Vaclav Vrba,Vladimir Weinzettl,Daniele Carnevale,J. Decker,Marco Gobbin,M. Gospodarczyk,Gergely Papp,Y. Peysson,V.V. Plyusnin,M. Rabinski,C. Reux,Compass Team +39 more
TL;DR: In this article, the decay phase of a runaway electron (RE) beam in the COMPASS tokamak with a focus on decay phase and control of the beam was investigated, and the performances of current control and radial and vertical position feedback control were experimentally studied and analyzed.
Journal ArticleDOI
Gas lasers pumped by runaway electrons preionized diffuse discharge
TL;DR: In this article, a review of gas lasers pumped by preionized diffuse discharge (REP DD) is presented, where various conditions under which the discharge occurs are described and the properties and parameters of REP DD plasma are considered.
Journal ArticleDOI
Emission of diamonds, leucosapphire, and KU-1 quartz in the range of 200–800 nm excited by electron beams with a pulse duration of 0.5 and 12 ns
Victor F. Tarasenko,V. I. Oleshko,Mikhail V. Erofeev,E. I. Lipatov,Dmitry V. Beloplotov,Mikhail I. Lomaev,Alexander G. Burachenko,E. Kh. Baksht +7 more
TL;DR: In this paper, the spectral and amplitude-time characteristics of the Cherenkov radiation of different specimens of diamonds, leucosapphire, and KU-1 quartz excited by the electron beams were compared.
Journal ArticleDOI
Overview of the COMPASS results <sup>*</sup>
TL;DR: In this article , the effect of high field-side error fields on the L-H transition was investigated in order to assess the influence of the central solenoid misalignment and the possibility to compensate these error fields by low-field-side coils.
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TL;DR: In this article, the status of the COMPASS-D tokamak, its comprehensive diagnostic equipment and plasma scenarios as a baseline for the future studies, is summarized and a characterization of the Ohmic as well as NBI-assisted H-modes is presented.