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Your search keyword '"Havlicek J"' showing total 22 results
Start Over Author "Havlicek J" Publisher elsevier b.v.
22 results on '"Havlicek J"'

2. Preliminary design of the COMPASS upgrade tokamak

Author

Vondracek, P., Panek, R., Hron, M., Havlicek, J., Weinzettl, V., Todd, T., Tskhakaya, D., Cunningham, G., Hacek, P., Hromadka, J., Junek, P., Krbec, J., Patel, N., Sestak, D., Varju, J., Adamek, J., Balazsova, M., Balner, V., Barton, P., Bielecki, J., Bilkova, P., Błocki, J., Bocian, D., Bogar, K., Bogar, O., Boocz, P., Borodkina, I., Brooks, A., Bohm, P., Burant, J., Casolari, A., Cavalier, J., Chappuis, P., Dejarnac, R., Dimitrova, M., Dudak, M., Duran, I., Ellis, R., Entler, S., Fang, J., Farnik, M., Ficker, O., Fridrich, D., Fukova, S., Gerardin, J., Hanak, I., Havranek, A., Herrmann, A., Horacek, J., Hronova, O., Imrisek, M., Isernia, N., Jaulmes, F., Jerab, M., Kindl, V., Komm, M., Kovarik, K., Kral, M., Kripner, L., Macusova, E., Majer, T., Markovic, T., Matveeva, E., Mikszuta-Michalik, K., Mohelnik, M., Mysiura, I., Naydenkova, D., Nemec, I., Ortwein, R., Patocka, K., Peterka, M., Podolnik, A., Prochazka, F., Prevratil, J., Reboun, J., Scalera, V., Scholz, M., Svoboda, J., Swierblewski, J., Sos, M., Tadros, M., Titus, P., Tomes, M., Torres, A., Tracz, G., Turjanica, P., Varavin, M., Veselovsky, V., Villone, F., Wąchal, P., Yanovskiy, V., Zadvitskiy, G., Zajac, J., Zak, A., Zaloga, D., Zelda, J., and Zhang, H.

Published
2021
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6. Constraints on conceptual design of diagnostics for the high magnetic field COMPASS-U tokamak with hot walls

Author

Weinzettl, V., Adamek, J., Bilkova, P., Havlicek, J., Panek, R., Hron, M., Bogar, O., Bohm, P., Casolari, A., Cavalier, J., Dejarnac, R., Dimitrova, M., Duran, I., Entler, S., Ficker, O., Hacek, P., Horacek, J., Imrisek, M., Jaulmes, F., Kovarik, K., Krbec, J., Kripner, L., Markovic, T., Naydenkova, D., Peterka, M., Podolnik, A., Pova, F., Sos, M., Sestak, D., Tomes, M., Varavin, M., Varju, J., Vondracek, P., and Zajac, J.

Published
2019
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8. Conceptual design of the COMPASS upgrade tokamak

Author

Panek, Radomir, Markovic, T., Cahyna, P., Dejarnac, R., Havlicek, J., Horacek, J., Hron, M., Imrisek, M., Junek, P., Komm, M., Sestak, D., Urban, J., Varju, J., Weinzettl, V., Adamek, J., Bilkova, P., Bohm, P., Dimitrova, M., Hacek, P., Kovarik, K., Krbec, J., Mlynar, J., Podolnik, A., Seidl, J., Stockel, J., Tomes, M., Zajac, F., Mitosinkova, K., Peterka, M., Vondracek, P., and the COMPASS team

Published
2017
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11. Overview of the COMPASS diagnostics

Author

Weinzettl, V., Panek, R., Hron, M., Stockel, J., Zacek, F., Havlicek, J., Bilkova, P., Naydenkova, D.I., Hacek, P., Zajac, J., Dejarnac, R., Horacek, J., Adamek, J., Mlynar, J., Janky, F., Aftanas, M., Bohm, P., Brotankova, J., Sestak, D., Duran, I., Melich, R., Jares, D., Ghosh, J., Anda, G., Veres, G., Szappanos, A., Zoletnik, S., Berta, M., Shevchenko, V.F., Scannell, R., Walsh, M., Müller, H.W., Igochine, V., Silva, A., Manso, M., Gomes, R., Popov, Tsv., Sarychev, D., Kiselov, V.K., and Nanobashvili, S.

Published
2011
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17. Upgrade of the COMPASS tokamak real-time control system.

Author

Janky, F., Havlicek, J., Batista, A.J.N., Kudlacek, O., Seidl, J., Neto, A.C., Pipek, J., Hron, M., Mikulin, O., Duarte, A.S., Carvalho, B.B., Stockel, J., and Panek, R.

Subjects
*TOKAMAKS, *REAL-time computing, *SYSTEMS theory, *SOLENOIDS, *ESTIMATION theory
Abstract

Highlights: [•] An upgrade of the COMPASS real-time system has been made to generally improve the plasma performance. [•] Stability of discharges in SNT configuration has been increased. [•] Plasma flat-top phase length has been extended. [•] Central solenoid protection has been developed. [•] Plasma position estimation has been improved. [ABSTRACT FROM AUTHOR]

Published
2014
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18. Power supplies for plasma column control in the COMPASS tokamak.

Author

Havlicek, J., Hauptmann, R., Peroutka, O., Tadros, M., Hron, M., Janky, F., Vondracek, P., Cahyna, P., Mikulín, O., Šesták, D., Junek, P., and Pánek, R.

Subjects
*ELECTRIC power, *PLASMA confinement, *TOKAMAKS, *MAGNETIC fields, *METAL oxide semiconductor field-effect transistors, *ELECTRIC potential, *THYRISTORS
Abstract

Abstract: The main magnetic fields in COMPASS – i.e. The Toroidal, Magnetising, Equilibrium, and Shaping Fields – are created by a set of four corresponding thyristor power supplies controlled in a 0.5ms loop. The plasma position has to be controlled both radially and vertically by two additional magnetic fields provided by two fast amplifiers (FAs) based on MOSFET technology, each supplying ±100V and up to ±5kA. Currently, an ongoing project aims at ELM triggering by fast changes of the vertical position of the plasma column, also referred to as vertical kicks. For this purpose, a new Vertical Kicks Power Supply (VKPS) capable of quick change of vertical plasma position is being constructed. This power supply should operate at up to 1.2kV with switching frequency up to 5kHz. It is designed as a H-bridge but based on IGBT transistors which can be operated at higher voltages than MOSFETs. In this paper, we focus on the FAs and VKPS engineering design and required output parameters. Both the power supplies are based on modern components with highest available ratings in their categories. Unique design of the power supplies takes advantage of the short duration of the COMPASS discharge by overloading the transistors above their maximal steady-state rating. The FA is regularly operating, so that in addition to describing its design, we also describe the achieved performance parameters. Finally, the common controller unit, communication, and error handling is described. [Copyright &y& Elsevier]

Published
2013
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20. Plasma density control in real-time on the COMPASS tokamak.

Author

Janky, F., Hron, M., Havlicek, J., Varavin, M., Zacek, F., Seidl, J., and Panek, R.

Subjects
*PLASMA density, *ELECTRON density, *TOKAMAKS, *FEEDBACK control systems, *INTERFEROMETERS
Abstract

The electron density on COMPASS is measured using 2 mm microwave interferometer. Interferometer signal is used as an input for the feedback control loop, running under the MARTe real-time framework. Two different threads are used to calculate (fast 50 μs thread) and to control (slow 500 μs thread) the electron density. The interferometer measures a line averaged density along a measurement chord. This paper describes an approach to control the line-averaged electron density in a real-time loop, using a correction to the real plasma shape, the plasma position, and non-linear effects of the electron density measurement at high densities. Newly developed real-time electron density control give COMPASS the chance to control the electron density more accurately which is essential for parametric scans for diagnosticians, for physics experiments and also for achieving plasma scenarios with H-mode. [ABSTRACT FROM AUTHOR]

Published
2015
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21. Validation of equilibrium tools on the COMPASS tokamak.

Author

Urban, J., Appel, L.C., Artaud, J.F., Faugeras, B., Havlicek, J., Komm, M., Lupelli, I., and Peterka, M.

Subjects
*TOKAMAKS, *MAGNETOHYDRODYNAMICS, *BOUNDARY value problems, *THERMODYNAMIC equilibrium, *PLASMA gases
Abstract

Various MHD (magnetohydrodynamic) equilibrium tools, some of which being recently developed or considerably updated, are used on the COMPASS tokamak at IPP Prague. MHD equilibrium is a fundamental property of the tokamak plasma, whose knowledge is required for many diagnostics and modelling tools. Proper benchmarking and validation of equilibrium tools is thus key for interpreting and planning tokamak experiments. We present here benchmarks and comparisons to experimental data of the EFIT++ reconstruction code (Appel et al., 2006), the free-boundary equilibrium code FREEBIE (Artaud and Kim, 2012), and a rapid plasma boundary reconstruction code VacTH (Faugeras et al., 2014). We demonstrate that FREEBIE can calculate the equilibrium and corresponding poloidal field (PF) coils currents consistently with EFIT++ reconstructions from experimental data. Both EFIT++ and VacTH can reconstruct equilibria generated by FREEBIE from synthetic, optionally noisy diagnostic data. Hence, VacTH is suitable for real-time control. Optimum reconstruction parameters are estimated. [ABSTRACT FROM AUTHOR]

Published
2015
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22. Overview of the COMPASS CODAC system.

Author

Hron, M., Janky, F., Pipek, J., Sousa, J., Carvalho, B.B., Fernandes, H., Vondracek, P., Cahyna, P., Urban, J., Paprok, R., Mikulín, O., Aftanas, M., Panek, R., Havlicek, J., Fortunato, J., Batista, A.J.N., Santos, B.A., Duarte, A., Pereira, T., and Valcarcel, D.

Subjects
*SYSTEMS theory, *ACQUISITION of data, *TELECOMMUNICATION, *COMPUTER software, *COMPUTER network protocols, *FEEDBACK control systems
Abstract

Highlights: [•] Overview of the Control, Data Acquisition, and Communication system (CODAC) on the COMPASS tokamak. [•] Set-up of CODAC hardware, software implementation, and communication tools. [•] Feedback control of COMPASS plasma using the MARTe framework. [•] Actuators, data sources, and data acquisition systems employed on COMPASS. [•] Communication links and protocols used within the COMPASS CODAC. [ABSTRACT FROM AUTHOR]

Published
2014
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