Mgr. Jozef Varju, Ph.D. [ Scientific Worker, Tokamak Department ]

Place: Tokamak Building, Office: G 115
Tel.: (+420) 266 052944
Fax: (+420) 286 890 448
Email: varju@ipp.cas.cz

Education

Master
Faculty of Mathematics and Physics, Charles University in Prague.
Recombination and Reactions of Ions in Plasma
Ph.D.
Faculty of Mathematics and Physics, Charles University in Prague.
Study of H3+ recombination in selected quantum states

Supervised students

2016 - now Michal Cihlář
Preparation of Bc. diploma work
High temperature vacuum devices
2016 - now Matej Škerlík
Preparation of Bc. diploma work
Measuring neutral gas in thermonuclear fusion apparatuses

Research projects

2011-2013Control of ELM size and frequency using externally imposed changes of the plasma position in the COMPASS tokamak
Co-investigator
Provider: Czech Science Foundation; Project ID: GAP205/11/2470

List of Publications

2016Mitošinková K., Stöckel J., Varju J., Weinzettl V.: Energy composition of high-energy neutral beams on the COMPASS tokamak. Nukleonika 61 [4] (2016) 419-423.
[ Abstract ]
[ Link ]
 
[Summer School of Plasma Diagnostics PhDiaFusion 2015: “Soft X-ray Diagnostics for Fusion Plasma”. Bezmiechowa, 16.06.2015-20.06.2015]
 Markovič T., Melnikov A., Seidl J., Eliseev L., Havlíček J., Havránek A., Hron M., Imríšek M., Kovařík K., Medvedev S., Mitošinková K., Mlynář J., Naydenkova D., Pánek R., Stöckel J., Varju J., Weinzettl V.: Observations of ALfvénic-character oscillations in ohmic plasmas on the COMPASS tokamak. EPS 2016: 43rd European Physical Society Conference on Plasma Physics. Vol. 40A. Mulhouse: European Physical Society, 2016 - (Mantica, P.; Giruzzi, G.; Fajardo, M.; Gans, T.; Poedts, S.; Vennekens, N.), č. článku P5.005. Europhysics Conference Abstracts (ECA), ECA, 40A. ISBN 2-914771-99-1.
[ Abstract ]

[EPS 2016: Conference on Plasma Physics/43./. Leuven (BE), 04.07.2016-08.07.2016]
2015Weinzettl V., Shukla G., Ghosh J., Melich R., Pánek R., Tomeš M., Imríšek M., Naydenkova D., Varju J., Pereira T., Gomes R., Abramovic I., Jaspers R., Písařík M., Odstrčil T., Van Oost G.: High-resolution spectroscopy diagnostics for measuring impurity ion temperature and velocity on the COMPASS tokamak. Engineering and Design. [October] (2015) 1006-1011.
[ Abstract ]
[ Link ]
 
[Symposium on Fusion Technology 2014(SOFT-28)/28./. San Sebastián, 29.09.2014-03.10.2014]
 Pánek R., Adámek J., Aftanas M., Bílková P., Böhm P., Brochard F., Cahyna P., Cavalier J., Dejarnac R., Dimitrova M., Grover O., Harrison J., Háček P., Havlíček J., Havránek A., Horáček J., Hron M., Imríšek M., Janky F., Kirk A., Komm M., Kovařík K., Krbec J., Kripner L., Markovič T., Mitošinková K., Mlynář J., Naydenkova D., Peterka M., Seidl J., Stöckel J., Štefániková E., Tomeš M., Urban J., Vondráček P., Varavin M., Varju J., Weinzettl V., Zajac J.: Status of the COMPASS tokamak and characterization of the first H-mode. Plasma Physics and Controlled Fusion 58 [1] (2015) 014015-014015.
[ Abstract ]
[ Link ]
 
2013Pánek R., Stöckel J., Havlíček J., Janky F., Hron M., Weinzettl V., Bílková P., Dimitrova M., Háček P., Dejarnac R., Aftanas M., Böhm P., Cahyna P., Imríšek M., Śtefániková E., Varju J.: Characterization of Ohmic and NBI heated H-mode in the COMPASS tokamak. EPS Conference on Plasma Physics. Helsinki : European Physical Society, 2013 - (Naulin, V.; Angioni, C.; Borghesi, M.; Ratynskaia, S.; Poedts, S.; Donné, T.; Kurki-Suonio, T.; Äkäslompolo, S.; Hakola, A.; Airila, M.), P4.103-P4.103 ISBN 2-914771-84-3. - (Europhysics Conference Abstracts).
[ Abstract ]
[ Link ]
 
[European Physical Society Conference on Plasma Physics/40./. Espoo (FI), 01.07.2013-05.07.2013]
2012Hejduk, M; Dohnal, P; Varju, J; Rubovic, P; Plasil, R; Glosik, J: Nuclear spin state-resolved cavity ring-down spectroscopy diagnostics of a low-temperature (H3+)-dominated plasma. Plasma Sources Sci. Technol., 21 (2): Art. No. 024002 (9 pages), 2012. [ Abstract ] [ Link ] [ DOI ]
 M. Hejduk, P. Dohnal, P. Rubovič, J. Varju, S. Opanasiuk, R. Plašil and J. Glosík: Equilibrium in Low Temperature H3+-dominated plasma, Application of CRDS spectroscopy. Acta Universitatis Carolinae, Mathematica et Physica, 53(1): 51–59, 2012 [ Abstract ] [ Link ]
2011Varju, J; Hejduk, M; Dohnal, P; Jilek, M; Kotrik, T; Plasil, R; Gerlich, D; Glosik, J: Nuclear Spin Effect on Recombination of H3+ Ions with Electrons at 77 K. Phys. Rev. Lett., 106 (20): Art. No. 203201 (4 pages), 2011. [ Abstract ] [ Link ] [ DOI ]
 Plasil, R; Varju, J; Hejduk, M; Dohnal, P; Kotrik, T; Glosik, J: Experimental study of para- and ortho-H3+ recombination. J. Phys.: Conf. Ser., 300 (1): Art. No. 012023 (8 pages), 2011. [ Abstract ] [ Link ] [ DOI ]
 P. Dohnal, M. Hejduk, J. Varju, P. Rubovic, R. Plasil, and J. Glosik: Recombination of Para- and Ortho- H3+ with Electrons in Low Temperature Afterglow Plasma. WDS'11 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránková and J. Pavlů, MATFYZPRESS, Prague, 2011, ISBN 978-80-7378-185-9, p.169-174  [ Abstract ] [ Link ]
2010T. Kotrík, P. Dohnal, I. Korolov, R. Plašil, J. Varju, J. Glosík: Temperature dependence of ternary recombination in H2 plasma. 10th European Conference on Atoms Molecules and Photons, X ECAMP, 4-9 July, 2010, Salamanca, poster P291, CD of abstracts P291 [ Abstract ]
 R. Plašil, T. Kotrík, P. Dohnal, J. Varju, M. Hejduk, J. Glosík,: Temperature and pressure dependence of D3+ recombination with electrons in afterglow plasma. XX ESCAMPIG, 13-17 July, 2010, Novi Sad, Serbia, poster P1.18, CD of abstracts P1.18
 Lange, M; Froese, M; Menk, S; Varju, J; Bastert, R; Blaum, K; Crespo Lopez-Urrutia, JR; Fellenberger, F; Grieser, M; von Hahn, R; Heber, O; Kuhnel, K-U; Laux, F; Orlov, DA; Rappaport, ML; Repnow, R; Schroter, CD; Schwalm, D; Shornikov, A; Sieber, T; Toker, Y; Ullrich, J; Wolf, A; Zajfman, D,: A cryogenic electrostatic trap for long-time storage of keV ion beams. Rev. Sci. Instrum., 81 (5): Art. No. 055105 (10 pages), 2010. [ Abstract ] [ Link ] [ DOI ]
 I. Zymak, P. Dohnal, J. Varju, R. Plašil and J. Glosík: Determination of translation temperature of N2+ ions trapped in 22-pole trap. WDS'10 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova,ISBN 978-80-7378-140-8, MATFYZPRESS (2010),66-69 [ Abstract ] [ Link ]
 J. Varju, M. Hejduk, P. Dohnal, T. Kotrík, M. Jílek, R. Plašil and J. Glosík: Recombination in plasmas with different populations of para and ortho H3+. WDS'10 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova,ISBN 978-80-7378-140-8, MATFYZPRESS (2010),60-65  [ Abstract ] [ Link ]
 P. Dohnal, T. Kotrik, J. Varju, I. Korolov, R. Plasil and J. Glosik: Ternary recombination in helium plasma. WDS'10 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova,ISBN 978-80-7378-140-8, MATFYZPRESS (2010), 42-47 [ Abstract ] [ Link ]
 T. Kotrík, P. Dohnal, R. Plašil, J. Varju, I. Korolov, J. Glosík: Experimental Study of Three-Body Recombination Ar+ + e + e. WDS'10 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova,ISBN 978-80-7378-140-8, MATFYZPRESS (2010),70-75 [ Abstract ] [ Link ]
 M. Hejduk, J. Varju, P. Dohnal, M. Jílek, R. Plašil, S. Roučka and J. Glosík: Formation and destruction of para and ortho H3+ in discharge and afterglow. Experiments with para-hydrogen. WDS'10 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova,ISBN 978-80-7378-140-8, MATFYZPRESS (2010),54-59 [ Abstract ] [ Link ]
 Buhr, H; Mendes, MB; Novotny, O; Schwalm, D; Berg, MH; Bing, D; Heber, O; Krantz, C; Orlov, DA; Rappaport, ML; Sorg, T; Stutzel, J; Varju, J; Wolf, A; Zajfman, D: Energy-sensitive imaging detector applied to the dissociative recombination of D2H+. Phys. Rev. A, 81 (6): Art. No. 062702 (10 pages), 2010. [ Abstract ] [ Link ] [ DOI ]
 Varju, J; Roucka, S; Kotrik, T; Plasil, R; Glosik, J: Application of NIR – CRDS for state selective study of recombination of para and ortho H3+ ions with electrons in low temperature plasma. J. Phys.: Conf. Ser., 227 (1): Art. No. 012026 (4 pages), 2010. [ Abstract ] [ Link ] [ DOI ]
 Glosik, J; Plasil, R; Kotrik, T; Dohnal, P; Varju, J; Hejduk, M; Korolov, I; Roucka, S; Kokoouline, V: Binary and ternary recombination of H3+ and D3+ ions with electrons in low temperature plasma. Mol. Phys., 108 (17): 2253–2264, 2010. [ Abstract ] [ Link ] [ DOI ]
2009J. Glosik, J. Varju, R. Plasil, S. Roucka: Application of NIR – CRDS for state selective study of recombination of para and ortho H3+ ions with electrons in low temperature plasma . 14th International symposiom on Laser-Aided Plasma Diagnostics Book of abstracts, p.40 2009
 J.Varju, I.Korolov, T.Kotrik, R.Plasil, J.Glosik: Near IR CRDS Study of HCN and HNC. XVII SAPP, January 17-22, Liptovský Ján, Slovakia, 17th Symposium on Application of Plasma Processes, Book of Contributed Papers, Edited by P. Papp, J. Országh, J. Matúška, Š. Matejčík, Published by UK Bratislava, ISBN 978-80-89186-45-7, 2pp, CD, Abstract 251-2, 2009
 T. Kotrík, I. Korolov, P. Dohnal, J. Varju, R. Plašil, J. Glosík,: Ternary Recombination In Deuterium Plasma. WDS'09 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media,ed. by J. Šafránkova, ISBN 978-80-7378-102-6, MATFYZPRESS (2009),  [ Abstract ] [ Link ]
 J. Varju, Š. Roučka , I. Korolov, P. Dohnal, T. Kotrík, R. Plašil and J. Glosík: State Selective Study of H3+ Recombination. WDS'09 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova, ISBN 978-80-7378-102-6, © MATFYZPRESS (2009), 129–133 [ Link ]
 M. Froese, K. Blaum, J.R. Crespo López-Urrutia, F. Fellenberger, M. Grieser, D. Kaiser, M. Lange, F. Laux, S. Menk, D.A. Orlov, R. Repnow, C.D. Schröter, D. Schwalm, A. Shornikov, T. Sieber, J. Ullrich, J. Varju, R. von Hahn, A Wolf, O. Heber, M. Rappaport, J. Toker, D. Zajfman, : Cryogenic ion beam storage. PAC 09 Proceedings, Vancouver, May 2009 [ Abstract ] [ Link ]
 Glosik, J; Korolov, I; Plasil, R; Kotrik, T; Dohnal, P; Novotny, O; Varju, J; Roucka, S; Greene, CH; Kokoouline, V: Binary and ternary recombination of D3+ ions with electrons in He-D2 plasma. Phys. Rev. A, 80 (4): Art. No. 042706 (7 pages), 2009. [ Abstract ] [ Link ] [ DOI ]
 Plasil, R; Korolov, I; Kotrik, T; Varju, J; Dohnal, P; Donko, Z; Bano, G; Glosik, J: Measurements of EEDF in recombination dominated afterglow plasma. J. Phys.: Conf. Ser., 192: Art. No. 012023 (4 pages), 2009. [ Abstract ] [ Link ] [ DOI ]
 Korolov, I; Kotrik, T; Plasil, R; Hejduk, M; Varju, J; Dohnal, P; Glosik, J: Recombination of KrD+ and KrH+ ions in afterglow plasma. J. Phys.: Conf. Ser., 192: Art. No. 012018 (4 pages), 2009. [ Abstract ] [ Link ] [ DOI ]
 Glosik, J; Plasil, R; Korolov, I; Kotrik, T; Novotny, O; Hlavenka, P; Dohnal, P; Varju, J; Kokoouline, V; Greene, CH: Temperature dependence of binary and ternary recombination of H3+ ions with electrons. Phys. Rev. A, 79 (5): Art. No. 052707 (12 pages), 2009. [ Abstract ] [ Link ] [ DOI ]
 P.Dohnal, I.Korolov, R.Plasil, T.Kotrik, J.Varju, J.Glosik,: Experimental Study of Binary and Ternary Recombination of D3+ Ions with Electrons in He/D2 Plasma,. XVII SAPP, January 17-22, Liptovský Ján, Slovakia, 17th Symposium on Application of Plasma Processes, Book of Contributed Papers, Edited by P. Papp, J. Országh, J. Matúška, Š. Matejčík, Published by UK Bratislava, ISBN 978-80-89186-45-7, 2pp, CD, Abstract 149-150, 2009
2008M. Lange, K. Blaum, M. Froese, M. Grieser, D. Kaiser, S. Menk, D.A. Orlov, A. Shornikov, T. Sieber, J. Varju, R. von Hahn, A. Wolf, O. Heber, M. Rappaport, J. Toker, D. Zajfman,: COMMISSIONING OF THE HEIDELBERG CRYOGENIC TRAP FOR FAST ION BEAMS (CTF). Proc. EPAC2008, Genoa, Italy, June 23-27, p. 319-3 [ Abstract ] [ Link ]
 Korolov, I; Kotrik, T; Plasil, R; Varju, J; Hejduk, M; Glosik, J: Application of Langmuir Probe in Recombination Dominated Afterglow Plasma. Contrib. Plasma Phys., 48 (5-7): 521–526, 2008. [ Abstract ] [ Link ] [ DOI ]
 J. Varju, M. Froese, M. Grieser. R. von Hahn, M. Lange, S. Menk, D. Orlov, A. Wolf, O. Heber, M. Rappaport, : Current Status of the Cryogenic Trap for Fast Ion Beams in Heidelberg. in WDS'08 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova, ISBN 978-80-7378-066-1, Matfyzpress, (2008), 48-51 [ Abstract ]
 von Hahn R., Froese M., Grieser M., Haberstroh Ch., Kaiser D., Lange M., Laux F., Menk S., Orlov D.A., Repnow R., Sieber T., Quack H., Varju J., Wolf A,: Commissioning of the Cryogenic Plant for the Cryogenic Storage Ring (CSR) at Heidelberg. Proc. ICEC 2008, Seoul, July 21-25, Korea,
 Glosik, J; Korolov, I; Plasil, R; Novotny, O; Kotrik, T; Hlavenka, P; Varju, J; Mikhailov, IA; Kokoouline, V; Greene, CH: Recombination of H+3 ions in the afterglow of a He–Ar–H2 plasma. J. Phys. B-At. Mol. Opt. Phys., 41 (19): Art. No. 191001 (6 pages), 2008. [ Abstract ] [ Link ] [ DOI ]
 R. von Hahn, K. Blaum, J. R. Crespo López-Urrutia, M. Froese, M. Grieser, M. Lange, F. Laux, S. Menk, J.Varju, D. A. Orlov, R. Repnow, C.D. Schröter, D. Schwalm, T. Sieber, J. Ullrich, A. Wolf, M. Rappaport, D. Zajfman, X. Urbain, H. Quack, : The cryogenic storage ring project at Heidelberg. Proc. EPAC2008, Genoa, Italy, June 23-27, p. 394-3 [ Abstract ] [ Link ]
2007R. Plasil, I. Korolov, T. Kotrik, J. Varju, P. Dohnal, Z. Donko, G. Bano, J. Glosik: Measurements of EEDF in recombination dominated afterglow plasma,. Symposium Dissociative Recombination, 18-23 July, Ameland, Netherlands, DR 2007 poster, , Book of abstracts, pp P23 [ Abstract ]
 I. Korolov, O. Novotný, J. Varju, T. Kotrík, R. Plašil, M. Hejduk, J. Glosík, : Application of Langmuir probe in recombination dominated afterglow plasma. 7. IWEP 2007 Prague, 7th International Workshop on Electrical Probes in Magnetized Plasma, 22nd – 25th July 2007, Book of abstracts, pp.62  [ Abstract ]
 R. Plašil, I. Korolov, T. Kotrík, O. Novotný, J. Varju, Z. Donko, G. Bánó, J. Glosík,: Study of Electron Energy Distribution Function in Helium Afterglow. ISPC 27.8.-31.8.2007, Proceedings of 16th International Symposium on Plasma Chemistry, Abstracts and full-papers CD, 30P-29, 4 pp [ Abstract ]
 J. Varju, P. Hlavenka, I. Korolov, R. Plasil, J. Glosik,: Near IR spectroscopy of HCN and HNC. WDS'07 Proceedings of contributed papers: Part II - Physics of Plasmas and Ionized Media, ed. by J. Šafránkova, Matfyzpress, 159-162, 2007 ISBN 978-80-7378-024-1 [ Abstract ] [ Link ]
 I. Korolov, T. Kotrik, R. Plasil, M. Hejduk, J. Varju, P. Dohnal, J. Glosik: Recombination in Kr/D2 and Xe/D2 afterglow plasma. Symposium Dissociative Recombination, 18-23 July, Ameland, Netherlands, DR 2007 poster, , Book of abstracts, pp P22 [ Abstract ]
2006P. Hlavenka, J. Varju, R. Plašil, I. Korolov, T. Kotrík, O. Votava, J. Glosík, High resolution : High resolution laser spectroscopy of ions. 16 th Symposium on Application of Plasma Processes, SAPP, Podbanské, Vysoké Tatry, January, 20-25, 2007, Edited by J. Matuska, S. Matejcik , . D. Skalny, ISBN: 978-80-89186-13-6, Book of Abstracts, pp 87-88
 Hlavenka, P; Korolov, I; Plasil, R; Varju, J; Kotrik, T; Glosik, J, : Near infrared second overtone cw-cavity ringdown spectroscopy of H2D+ ions. Czech. J. Phys., 56: B749–B760 [ Abstract ] [ Link ] [ DOI ]