Reduction of localised heat loads in divertor of COMPASS tokamak by means of novel active techniques
Project ID:GA16-14228S
Provider:Czech Science Foundation
Period:Feb 01, 2016 - Jan 31, 2018
Principal Investigator:Mgr. Michael Komm, Ph.D.
Co-investigatorsJ. Adámek, J. Horáček, R. Dejarnac, P. Vondráček, J. Stöckel

Aims of the project: One of the key impediments limiting performance of future thermonuclear reactors is the distribution of heat fluxes on the plasma facing components. The incoming heat flux must not exceed material limits of the components, otherwise the compontents suffer damage and their lifetime is drastically reduced. The goal of this project is to investigate experimentally two active techniques to broaden the heat flux deposition pattern and thus alleviate loading of the components. First technique is based on floating divertor tiles, second uses localised gas puff in divertor. Both techniques aim at creating flux tubes at altered plasma potentials, resulting in an ExB drift pushing particles away from the locations of high heat flux. All experiments will be performed in the COMPASS tokamak, which is a highly flexible device allowing rapid development of the techniques. At the same time it can reach relevant plasma conditions (ELMy H-mode).

Results:

Horáček J., Entler S., Vondráček P., Adámek J., Šesták D., Hron M., Pánek R., Dejarnac R., Weinzettl V., Kovařík K., Van Oost G.: Plans for Liquid Metal Divertor in Tokamak Compass. Plasma Physics Reports 44 [7] (2018) 652-656. [ Abstract ] [ Link ]
[International Symposium on Liquid metals Applications for Fusion (ISLA2017) /5./. Moscow, 25.09.2017-27.09.2017]

Podolník A., Komm M., Adámek J., Háček P., Krbec J., Dejarnac R., Gunn J. P., Pánek R.: 3D particle-in-cell modeling of Langmuir probe effective collecting area in magnetized plasma. Plasma Physics and Controlled Fusion 60 [8] (2018) č. článku 085008. [ Abstract ] [ Link ]

Horáček J., Entler S., Vondráček P., Adámek J., Šesták D., Hron M., Pánek R., Dejarnac R., Weinzettl V., Kovařík K., Van Oost G.: PLANIRUYEMYY ZHIDKOMETALLICHESKIY DIVERTOR DLYA TOKAMAKA COMPASS. FIZIKA PLAZMY. Moskva, 2018, s. 557-563. ISSN 0367-2921. [ Abstract ] [ Link ]
[International symposium on liquid metals applications for fusion (ISLA-5). Moskva (RU), 25.09.2017-25.09.2017]

Dejarnac R., Corre Y., Vondráček P., Gaspar J., Gauthier E., Gunn J. P., Komm M., Gardarein J.-L., Horáček J., Hron M., Matějíček J., Pitts R.A., Pánek R.: Heat loads on poloidal and toroidal edges of castellated plasma-facing components in COMPASS. Nuclear Fusion 58 [6] (2018) č. článku 066003. [ Abstract ] [ Link ]

Komm M., Bílková P., Aftanas M., Berta M., Böhm P., Bogár O., Frassinetti L., Grover O., Háček P., Havlíček J., Hron M., Imríšek M., Krbec J., Mitošinková K., Naydenkova D., Pánek R., Peterka M., Snyder P.B., Stefanikova E., Stöckel J., Šos M., Urban J., Varju J., Vondráček P., Weinzettl V.: Contribution to the multi-machine pedestal scaling from COMPASS tokamak. Nuclear Fusion 57 [5] (2017) č. článku 056041. [ Abstract ] [ Link ]
[IAEA Fusion Energy Conference (FEC 2016)/26./. Kyoto, 17.10.2016-22.10.2016]

Adámek J., Seidl J., Horáček J., Komm M., Eich T., Pánek R., Cavalier J., Devitre A., Peterka M., Vondráček P., Stöckel J., Šesták D., Grover O., Bílková P., Böhm P., Varju J., Havránek A., Weinzettl V., Lovell J., Dimitrova M., Mitošinková K., Dejarnac R., Hron M.: Electron temperature and heat load measurements in the COMPASS divertor using the new system of probes. Nuclear Fusion 57 [11] (2017) č. článku 116017. [ Abstract ] [ Link ]

Komm M., Ratynskaia S., Tolias P., Cavalier J., Dejarnac R., Gunn J. P., Podolník A.: On thermionic emission from plasma-facing components in tokamak-relevant conditions. Plasma Physics and Controlled Fusion 59 [9] (2017) č. článku 094002. [ Abstract ] [ Link ]

Adámek J., Seidl J., Horáček J., Komm M., Eich T., Pánek R., Cavalier J., Devitre A., Peterka M., Vondráček P., Stöckel J., Šesták D., Grover O., Bílková P., Böhm P., Varju J., Havránek A., Weinzettl V., Lovell J., Dimitrova M., Mitošinková M., Dejarnac R., Hron M.: Electron temperature and heat load measurements in the COMPASS divertor using the new system of probes. Nuclear Fusion 57 [11] (2017) č. článku 116017. [ Abstract ] [ Link ]

Komm M., Tolias P., Ratynskaia S., Dejarnac R., Gunn J. P., Krieger K., Podolník A., Pitts R.A., Pánek R.: Simulations of thermionic suppression during tungsten transient melting experiments. Scripta. T170 [December] (2017) č. článku 014069. [ Abstract ] [ Link ]
[PFMC 2017: 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications. Düsseldorf, 16.05.2017-19.05.2017]

Komm M., Cavalier J., Seidl J., Adámek J., Bílková P., Böhm P., Devitre A., Dimitrova M., Elmore S., Faitsch M., Háček P., Havlíček J., Imríšek M., Krbec J., Peterka M., Pánek R., Popov T., Tomeš M., Weinzettl V.: First detachment studies on COMPASS tokamak using nitrogen seeding. EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P1.118. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07. [ Abstract ]
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]

Vondráček P., Adámek J., Cavalier J., Devitre A., Horáček J., Hron M., Pánek R., Peterka M., Seidl J.: Divertor heat load study in COMPASS using IR thermography and divertor probes. EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P1.120. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07. [ Abstract ]
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]

Podolník A., Komm M., Adámek J., Háček P., Krbec J., Dejarnac R., Pánek R., Gunn J. P.: Particle-in-cell simulations of Langmuir probes at COMPASS tokamak. EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P1.110. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07. [ Abstract ]
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]

Horáček J., Cunningham G., Entler S., Dobias P., Duban R., Imríšek M., Markovič T., Havlíček J., Enikeev R.: Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks. Fusion Engineering and Design 123 [November] (2017) 646-649. [ Abstract ] [ Link ]
[SOFT 2016: Symposium on Fusion Technology /29./. Prague, 05.09.2016-09.09.2016]

Komm M., Gunn J. P., Dejarnac R., Pánek R., Pitts R.A., Podolník A.: Particle-in-cell simulations of the plasma interaction with poloidal gaps in the ITER divertor outer vertical target. Nuclear Fusion 57 [12] (2017) č. článku 126047. [ Abstract ] [ Link ]