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2. Development of the diagnostic tools for the COMPASS-U tokamak and plans for the first plasma

Author

Weinzettl, Vladimir, Bilkova, Petra, Duran, Ivan, Hron, Martin, Panek, Radomir, Markovic, Tomas, Varavin, Mykyta, Cavalier, Jordan, Kovarik, Karel, Torres, André, Matveeva, Ekaterina, Böhm, Petr, Ficker, Ondrej, Horacek, Jan, Cerovsky, Jaroslav, Zajac, Jaromir, Adamek, Jiri, Dimitrova, Miglena, Imrisek, Martin, Sos, Miroslav, Tomesova, Eva, Vondracek, Petr, Mikszuta-Michalik, Katarzyna, Svoboda, Jakub, Naydenkova, Diana, Bogar, Klara, Caloud, Jakub, Ivanov, Vladislav, Lukes, Samuel, Podolnik, Ales, Bogar, Ondrej, Entler, Slavomir, Havranek, Ales, Preinhaelter, Josef, Jaulmes, Fabien, Dejarnac, Renaud, Balner, Vojtech, Veselovsky, Viktor, Belina, Pavel, Kral, Miroslav, Gerardin, Jonathan, Vlcek, Jiri, Tadros, Momtaz, Turjanica, Pavel, Kindl, Vladimir, Reboun, Jan, Rowan, William, Houshmandyar, Saeid, Scholz, Marek, Bielecki, Jakub, Makowski, Dariusz, Chernyshova, Maryna, and Cipciar, Dario

Published
2023
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3. Plasma exposure of a pre-damaged ITER-like plasma facing unit in the WEST tokamak: in-situ and post-mortem measurements

Author

Corre, Yann, Loewenhoff, Torsten, Richou, Marianne, Brezinsek, Sebastijan, Coenen, Jan, Dejarnac, Renaud, Diez, Mathilde, Fedorczak, Nicolas, Firdaouss, Mehdi, Gaspar, Jonathan, Grosjean, Alex, Gunn, James-Paul, Loarer, Thierry, Martin, Céline, Pintsuk, Gerald, Reilhac, Pierre, Tichit, Quentin, Tsitrone, Emmanuelle, Wirtz, Marius, and WEST team, the

Published
2023
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4. COMPASS Upgrade: a high field tokamak for ITER- and DEMO-relevant research

Author

Komm, Michael, primary, Jaulmes, Fabien, additional, Grover, Ondrej, additional, Peterka, M, additional, Seidl, Jakub, additional, Imrisek, Martin, additional, Saarelma, Samuli, additional, Snyder, Philip B, additional, Šos, Miroslav, additional, Caloud, Jakub, additional, Borodkina, Irina, additional, Shyshkin, Oleg, additional, Cecrdle, Jan, additional, Farnik, Michal, additional, Gerardin, Jonathan, additional, Kripner, Lukas, additional, Dejarnac, Renaud, additional, Horacek, Jan, additional, Lukes, Samuel, additional, Havlicek, Josef, additional, Tskhakaya, David, additional, Hron, Martin, additional, Panek, Radomir, additional, Vondracek, Petr, additional, and Weinzettl, Vladimir, additional

Published
2024
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6. Latest results of EUROfusion Plasma-Facing Components research in the areas of power loading, material erosion and fuel retention

Author

Reinhart, Michael, primary, Brezinsek, Sebastijan, additional, Kirschner, Andreas, additional, Coenen, Jan Willem, additional, Schwarz-Selinger, Thomas, additional, Schmid, Klaus, additional, Hakola, Antti, additional, van der Meiden, Hennie Johannes, additional, Dejarnac, Renaud, additional, Tsitrone, Emmanuelle, additional, Doerner, Russell P, additional, Baldwin, Matthew J, additional, and Nishijima, Daisuke, additional

Published
2021
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8. Tomographic reconstruction of COMPASS tokamak edge turbulence from single visible camera data and automatic turbulence structure tracking

Author

Cavalier, Jordan, Lemoine, Nicolas, Brochard, F., Weinzettl, Vladimir, Seidl, Jakub, Silburn, Scott, Tamain, Patrick, Dejarnac, Renaud, Adamek, Jiri, Panek, Radomir, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IPP PRAGUE - Institute of Plasma Physics, Association EURATOM, Institute of Plasma Physics, Association EURATOM (IPP PRAGUE), Czech Academy of Sciences [Prague] (CAS), EURATOM/CCFE Fusion Association, Culham Science Centre [Abingdon], Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institute of Plasma Physics, Association Euratom/IPP.CR (IPP PRAGUE), brochard, frédéric, and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, [SPI.PLASMA] Engineering Sciences [physics]/Plasmas, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; The growing capabilities (speed, sensitivity, dynamic range) of fast visible cameras make this tool more and more interesting for diagnosing turbulence in plasma devices, and in particular, in fusion ones. Especially, cameras' speed is approaching probe acquisition frequencies while they usually reach higher spatial resolution. On the other hand, light emission from a plasma is usually not local and makes the data interpretation difficult. To overcome this 3D problem, imaging of a poloidal gas-puff jet has become a common method. However, this method is known to locally perturb the plasma and to have effect on the probed turbulence [1]. In this contribution, we present tomographic inversion of edge turbulence recorded by a single visible camera observing the interaction between the edge plasma and the neutral gas naturally present in the vacuum vessel (i.e. no extra gas-puff) [2]-therefore a fully passive observation. Since the observed turbulent structures (filaments) are 3D and their images on the camera chip 2D, an assumption has to be taken to avoid ill-posed problems. As velocities of charged particles along field lines are very high, it is possible to assume that light emissivity is constant along that direction and then to reconstruct any poloidal plane in the field of view of the camera. Within this assumption, the method has been carefully checked using synthetic data from the TOKAM3X code [3] and then further validated by comparing experimental camera and Langmuir probe data. Using a recently developed detection and tracking software [4], it is then possible to study the position, size and velocity of the turbulent structures in the reconstructed poloidal plane and to obtain reliable statistics.

Published
2019

10. Remote operation of the GOLEM tokamak with hydrogen and helium plasmas

Author

Svoboda, Vojtěch, Dvornova, Anastasiia, Dejarnac, Renaud, Procházka, Michal, Zapryanov, Stanislav, Akhmetzhanov, Ruslan, Bogdanova, Maria, Dimitrova, Miglena, Dimitrov, Zhivko, Dřímalková, Lucie, Ivanov, Krasimir, Kruglov, Kirill, Marinova, Plamena, Masherov, Pavel, Mogulkin, Andrey, Mlynář, Jan, Stockel, Jan, Volynets, Andrey, Svoboda, Vojtěch, Dvornova, Anastasiia, Dejarnac, Renaud, Procházka, Michal, Zapryanov, Stanislav, Akhmetzhanov, Ruslan, Bogdanova, Maria, Dimitrova, Miglena, Dimitrov, Zhivko, Dřímalková, Lucie, Ivanov, Krasimir, Kruglov, Kirill, Marinova, Plamena, Masherov, Pavel, Mogulkin, Andrey, Mlynář, Jan, Stockel, Jan, and Volynets, Andrey

Abstract

The GOLEM tokamak was operated remotely via internet connection during the 6th International Workshop and Summer School on Plasma Physics. Performances of hydrogen and helium discharges are compared in this paper. It is found, with similar vacuum conditions that helium discharges are shorter but the breakdown of the working gas can be quite easily achieved at almost the same loop voltage. The plasma current in helium discharges is slightly lower than in the case of hydrogen. Turbulent fluctuations of the floating potential measured by means of anarray of Langmuir probes reveal a noticeably different character., Tokamak GOLEM byl během konference 6th International Workshop and SummerSchool on Plasma Physicsna dálku řízen přes internet. V tomto článku jsou porovnávány experimenty s vodíkovým a héliovým plazmatem.Bylo zjištěno, že při stejných vakuových podmínkách jsou héliové výboje kratší, ale zažehnutí pracovního plynu může být jednoduše dosaženo při téměř stejném smyčkovém napětí.Plazmový proud je v héliových výbojích trochu nižší než v případě vodíku.Turbulentní fluktuace plovoucího potenciálu, měřeného polem Langmuirových sond, odhalily značně odlišný charakter plazmatu v použitých plynech.

Published
2016

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