The impact of error fields on enhanced confinement regimes in tokamaks
Project ID:GA19-15229S
Provider:Czech Science Foundation
Period:Jan 01, 2019 - Dec 31, 2022
Recipient - coordinatorInstitute of Plasma Physics, Czech Academy of Sciences, Prague
Principal Investigator:RNDr. Petra Bílková, Ph.D.
Co-recepient(s) / PI(s):Institute of Plasma Physics, Czech Academy of Sciences, Prague -- Petra Bílková
Co-investigators from IPPM. Peterka, O. Grover, J. Seidl, R. Dejarnac, M. Komm, M. Šos, P. Böhm, J. Krbec, M. Tomeš, O. Bogár, V. Weinzettl, J. Havlíček, T. Markovič, J. Cavalier, K. Hromasová, J. Hečko, L. Kripner

Aims of the project: One of the outstanding issues on the road towards controlled thermonuclear fusion with magnetic confinement is the access to the high confinement mode (H-mode) in the ITER tokamak, necessary for achieving its goal of tenfold fusion power gain. The access can be significantly altered by the presence of so called error fields arising from improperly aligned magnetic coils and solenoids. The preliminary results of the very recent experiments at the COMPASS tokamak with a world-unique combination of inboard and outboard error field correction coils have demonstrated that under specific conditions the inboard-generated error fields could be very significant for ITER H-mode operation, possibly preventing access to Hmode altogether. The proposed project aims to analyze these promising first results from the COMPASS tokamak in detail and to design and execute follow-up experiments with an extended range of plasma parameters in order to build a more robust physics picture of the impact of error fields on access to regimes with enhanced confinement in general.

Results:

Grover O., Manz P., Yashin A. Y., Réfy D., Seidl J., Vianello N., Birkenmeier G., Solano E. R., Šos M., Böhm P., Bílková P., Hron M., Pánek R.: Experimentally corroborated model of pressure relaxation limit cycle oscillations in the vicinity of the transition to high confinement in tokamaks. Nuclear Fusion 64 [2] (2024) č. článku 026001. [ Abstract ] [ Link ]

Hečko J., Komm M., Šos M., Adámek J., Bílková P., Bogár K., Böhm P., Jaulmes F., Mysiura I., Tomeš M., Vondráček P., Hron M., Pánek R.: Experimental evidence of very short power decay lengths in H-mode discharges in the COMPASS tokamak. Plasma Physics and Controlled Fusion 66 [1] (2024) č. článku 015013. [ Abstract ] [ Link ]

Kripner L., Krbec J., Zelda J., Markovič T., Titus P., Vondráček P., Ficker O., Hron M.: Toroidal magnetic field ripple in the presence of misaligned toroidal field coils on the COMPASS-U tokamak. Fusion Engineering and Design 187 [February] (2023) č. článku 113378. [ Abstract ] [ Link ]

Hron M., Adámek J., Cavalier J., Dejarnac R., Ficker O., Grover O., Horáček J., Komm M., Macúšová E., Matveeva E., Pánek R., Peterka M., Seidl J., Tskhakaya D., Yanovskiy V., Artola F. J., Atikukke S., Bartoň P., Bencze A., Berta M., Bílková P., Bin W., Bogár K., Bogár O., Böhm P., Borodkina I., Brezinsek S., Brochard F., Buratti P., Čaloud J., Casolari A., Castaldo C., Čečrdle J., Čeřovský J., Cipciar A., Devitre A., Dimitrova M., Ďuran I., Entler S., Farník M., Fernandes H., Fridrich D., Fuková Š., Gauthier E., Gerardin J., Gobbin M., Grenfell G., Gribov Y., Grof M., Gunn J., Háček P., Havlíček J., Havránek A., Hidalgo C., Hromasová K., Hronová-Bilyková O., Iafrati M., Imríšek M., Isernia N., Jaulmes F., Jeřáb M., Jirsa M., Junek P., Kallenbach A., Kovanda O., Kovařík K., Krbec J., Kripner L., Krlín L., Kulhánek P., Lehnen M., Lemoine N., Litaudon X., Liu Y.Q., Logan N. C., Loarer T., Loarte A., Lourenco P., Lukeš S., Mácha P., Rabinski M., Marin Roldan A., Markovič T., Matějíček J., Mazzitelli G., Mlynář J., Mysiura I., Napoli F., Naydenkova D., Park J. K., Patel N., Pavlo P., Pitts R., Podolník A., Poradzinski M., Preinhaelter J., Prishvitsin A., Refy D., Roccella R., Šesták D., Shyshkin O., Škvára V., Šos M., Spolaore M., Stöckel J., Svoboda J., Tomeš M., Torres A., Turjanica P., Tynan G., Valovič M., Van Oost G., Varavin M., Varju J., Veis P., Vilémová M., Villone F., Vondráček P., Weinzettl V., Žáček F., Zadvitskiy G., Zajac J., Zaloga D., Zebrowski J., Zoletnik S.: Overview of the COMPASS results. Nuclear Fusion 62 [4] (2022) č. článku 042021. [ Abstract ] [ Link ]

Zorek M., Škvára V., Smidl L., Pevný T., Seidl J., Grover O.: Semi-supervised deep networks for plasma state identification. Plasma Physics and Controlled Fusion 64 [12] (2022) č. článku 125004. [ Abstract ] [ Link ]

Tomeš M., Carr M., Meakins A., Šos M., Böhm P., Bílková P., Imríšek M., Jaulmes F., Borodkina I., Hečko J., Hron M., Pánek R.: Thomson scattering synthetic diagnostic module for the Cherab framework. Review of Scientific Instruments 92 [5] (2021) č. článku 053532. [ Abstract ] [ Link ]

Horáček J., Adámek J., Komm M., Seidl J., Vondráček P., Jardin A., Guillemaut C., Elmore S., Thornton A., Jiráková K., Jaulmes F., Deng G., Gao X., Wang L., Ding R., Brunner D., LaBombard B., Olsen J., Rasmussen J.J., Nielsen A.H., Naulin V., Ezzat M., Camacho K., Hron M., Matthews G. F.: Scaling of L-mode heat flux for ITER and COMPASS-U divertors, based on five tokamaks. Nuclear Fusion 60 [6] (2020) č. článku 066016. [ Abstract ] [ Link ]

Bogár O., Zajac J., Žáček F., Varavin M., Hron M., Pánek R., Silva A.: Microwave reflectometer for density profile and turbulence measurements on the COMPASS tokamak. Review of Scientific Instruments 91 [1] (2020) č. článku 013515. [ Abstract ] [ Link ]

Logan N. C., Park J. K., Hu Q., Paz-Soldan C., Markovič T., Wang H., In Y., Piron L., Piovesan P., Myers C. E., Maraschek M., Wolfe S. M., Strait E., Munaretto S.: Empirical scaling of the n = 2 error field penetration threshold in tokamaks. Nuclear Fusion 60 [8] (2020) č. článku 086010. [ Abstract ] [ Link ]

Adámek J., Tskhakaya D., Devitre A., Cavalier J., Horáček J., Komm M., Šos M., Bílková P., Böhm P., Seidl J., Weinzettl V., Vondráček P., Markovič T., Hron M., Pánek R.: On the transport of edge localized mode filaments in the tokamak scrape-off layer. Nuclear Fusion 60 [9] (2020) č. článku 096014. [ Abstract ] [ Link ]

Logan N. C., Park J. K., Hu Q., Paz-Soldan C., Markovič T., Wang H., In Y., Piron L., Piovesan P., Myers C. E., Maraschek M., Wolfe S. M., Strait E., Munaretto S.: Robustness of the tokamak error field correction tolerance scaling. Plasma Physics and Controlled Fusion 62 [8] (2020) č. článku 084001. [ Abstract ] [ Link ]

Jiráková K., Kovanda O., Adámek J., Komm M., Seidl J.: Systematic errors in tokamak magnetic equilibrium reconstruction: A study of EFIT++ at tokamak COMPASS. Journal of Instrumentation 14 [11] (2019) č. článku C11020. [ Abstract ] [ Link ]