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«Association EURATOM / IPP.CR I N S T I T U T E O F P L A S M A P H Y S I C S, v.v. i. ACADEMY OF SCIENCES OF THE CZECH REPUBLIC ANNUAL REPORT ...»

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Performance of Hall Sensor-Based Devices for Magnetic Field Diagnosis at Fusion Reactors. Sensor Letters 5 (2007) 283-288 [92] Ďuran I., Sentkerestiová J., Bilykova O., Stockel J.: Measurement of magnetic field using array of integrated Hall detectors on the CASTOR tokamak.. Europhysics Conference Abstracts 31F (2007) P2.152 [93] Kovařík K.: Měření faktoru zásoby stability pomocí Hallových senzorů na tokamaku CASTOR. bachelor thesis on KJR FJFI CVUT Praha 2007 [94] Kasperczuk A., Pisarczyk T., Badziak J., Miklaszewski R., Parys P., Rosinski M., Wolowski J., Stenz C., Ullschmied J., Krousky E., Masek K., Pfeifer M., Rohlena K., Skala J., Pisarczyk P. : Influence of the focal point position on the properties of a laser-produced plasma. Physics of Plasmas Vol.14, No.10 (2007)Art. No. 102706 [95] Badziak J., Kasperczuk A., Parys P., Pisarczyk T., Rosinski M., Ryc L., Wolowski J., Jablonski S., Suchanska R., Krousky E., Laska L., Masek K., Pfeifer M., Ullschmied J., Dareshwar L.J., Foldes I., Torrisi L., Pisarczyk P. Production of high-current heavy ion jets at the short-wavelength subnanosecond laser-solid interaction. Applied Physics Letters Vol.91, No.8 (2007) Art. No. 081502

Part II - PHYSICS

[96] Pisarczyk T., Kasperczuk A., Krousky E., Masek K., Miklaszewski R., Nicolai Ph., Pfeifer M., Pisarczyk P., Rohlena K., Stenz Ch., Skala J., Tikhonchuk V., Ullschmied J.: The PALS iodine laser-driven jets. Plasma Phys. Control. Fusion 49(2007)B611-B619 [97] Kasperczuk A., Pisarczyk T., Nicolai Ph., Stenz Ch., Tikhonchuk V., Ullschmied J., Krousky E., Masek K., Pfeifer M., Rohlena K., Skala J., Kalal M., Pisarczyk P. : Plasma jet interaction with ambient media.. Physics of Plasmas Submitted 12.12.2007.

[98] Velarde, P., Gonzalez M., Garcia-Fernandez C., Oliva E., Kasperczuk A., Pisarczyk T., Ullschmied J., Colombier J-P., Ciardi A., Stehle Ch., Busquet M., Rus, B., Garcia-Senz D., Bravo E., Relano A. : Simulations of radiative shocks and jet formation in laboratory plasmas. IFSA2007, Kobe Japan, September 9-14, 2007 paper ThO2.4 [99] Pisarczyk T., Kasperczuk A., Nicolai Ph., Ribeyre X., Stenz Ch., Krousky E., Masek K., Pfeifer M., Rohlena K., Skala J., Ullschmied J., Kalal M., Pisarczyk P. : PALS laser-driven radiative jets for astrophysical and ICF applications. PLASMA 2007, October 16-19, 2007 Greifswald, Germany poster paper WeP44 [100] J. P. Gunn, L. Colas, A. Ekedahl, E. Faudot, V. Fuchs, S. Heuraux, M.

Goniche, M. Kočan, A. Ngadjeu, V. Petržílka, F. Saint-Laurent, K. Vulliez:

Extreme Scrape-off Layer Phenomena during RF Heating in Tore Supra.

Proposed for 22nd IAEA Fusion Energy Conference, Geneva 2008, Switzerland.

[101] M. Goniche, A. Ekedahl, K. Rantamäki, J. Mailloux, V. Petrzilka, G.

Arnoux, Y. Baranov, L. Delpech, K. Erents, P. Jacquet, K. Kirov, M-L.

Mayoral, J. Ongena, F. Piccolo, A. Sirinelli, M. Stamp, K-D. Zastrow and JET EFDA contributors: Lower Hybrid Current Drive Experiments on JET in ITER-Relevant Coupling Conditions. Proposed for 22nd IAEA Fusion Energy Conference, Geneva 2008, Switzerland, on JET pinboard [102] J. Gunn, V. Petrzilka, A. Ekedahl, V. Fuchs, E. Gauthier, M. Goniche, M.

Kocan, F. Saint-Laurent: Measurement of LH hot spots using a retarding field analyzer in Tore Supra. Accepted oral paper for PSI-18 Plasma Surface Interactions in Controlled Fusion Devices, Toledo 2008, Spain [103] J. Ongena,Yu.Baranov, V.Bobkov, C.D.Challis, L.Colas, S.Conroy, F.Durodié, A.Ekedahl, G.Ericsson, L.-G.Eriksson, Ph.Jacquet, I.Jenkins, T.Johnson, L.Giacomelli, M.Goniche, G.Granucci, C.Hellesen, T.Hellsten, A.Hjalmarsson, K.Holmström, S.Huygen, J.Källne, V.Kiptily, K.Kirov, A.Krasilnikov, M.Laxåback, E.Lerche, J.Mailloux, M.L.Mayoral, I.Monakhov, M.Nave, M.Nightingale, J.M.Noterdaeme, M.Lennholm, V.Petrzilka, K.Rantamaki, A.Salmi, M.Santala, E.Solano, D.Van Eester, M.Vervier, M.Vrancken, A.Walden : ITER-relevant Heating and Current Drive Studies on JET. Propose 22nd IAEA Fusion Energy Conference, Geneva 2008, Switzerland [104] K. Rantamäki, A. Ekedahl, M. Goniche, J. Mailloux, V. Petrzilka, G.

Granucci, B. Alper, G. Arnoux, Y. Baranov, V. Basiuk, P. Beaumont, G.

Calabrò, V. Cocilovo, G. Corrigan, L. Delpech, K. Erents, D. Frigione, N.

ANNUAL REPORT 2007 ASSOCIATION EURATOM/IPP.CR Hawkes, J. Hobirk, F. Imbeaux, E. Joffrin, K. Kirov, T. Loarer, D.

McDonald, F. Nave, I. Nunes, J. Ongena, V. Parail, F. Piccolo, E. Rachlew, C. Silva, A. Sirinelli, M. Stamp, K-D. Zastrow and JET EFDA contributors: LH power coupling over ITER-like plasma-wall distances at JET. to be submitted to Plasma Physics and Controlled Fusion [105] M.Goniche, A.Ekedahl, J.Mailloux, V.Petržílka, K.Rantamäki, P.Belo, G.Corrigan, L.Delpech, K.Erents, P.Jacquet, K.Kirov, M.-L.Mayoral, J.Ongena, C.Portafaix, M.Stamp, K.-D.Zastrow and JET EFDA contributors: SOL characterisation and LH coupling measurements on JET in ITER relevant conditions. to be submitted to Nuclear Fusion [106] V. Petrzilka, M. Goniche, F. Clairet, G. Corrigan, P. Belo, J. Ongena and JET EFDA contributors: On SOL Variations as a Function of LH Power 35th EPS Conf on Plasma Physics, Hersonissos 2008, Crete, Greece [107] Borisenko N.G., Khalenkov A.M., Kmetik V., Limpouch J., Merkuliev Yu.A., Pimenov V.G.: Plastic Aerogel Targets and Optical Transparency of Undercritical Microheterogeneous Plasma,. Fusion Science and Technology 51 (2007) 655-664.





[108] Borisenko N.G., AkunetsA.A., Khalenkov A.M., Klir D., Kmetik V., Krousky E., Limpouch J., Masek K., Merkuliev Yu.A., Pfeifer M., Pimenov V.G., Ullschmied J.: Particular features of the transmission of laser radiation with wavelength 0.438 µm and intensity (3–7)×1014 W/cm2 through an undercritical plasma from polymer aerogels,. Journal of Russian Laser Research 28 (2007) 548-566 [109] Kasperczuk A., Pisarczyk T., Gus’kov S.Yu., Ullschmied J., Krousky E., Masek K., Pfeifer M., Rohlena K., Skala J., Kalal M., Tikhonchuk V., Pisarczyk P.: Laser Energy Transformation to Shock Waves in Multi-Layer Flyers. PPLA-2007 (Plasma Production by Laser Ablation) June, 14th-16th 2007, Scilla, Italy, oral paper Friday 2-2 [110] Rozanov V., Barishpoltsev D., Vergunova G., Gus’kov S., Demchenko N., Doskach I., Ivanov E., Aristova E., Zmitrenko N., Limpouch J., Klir D., Krousky E., Masek K., Kmetik V., Ullschmied J.: : Energy transfer in lowdensity porous targets doped by heavy elements,. Inertial Fusion Science and Applications, Kobe, Japan, 9.-14.9.2007, paper TuPo26, Book of Abstracts, p.

173 (Proceedings in print).

[111] Limpouch J., Renner O., Krousky E., Nazarov W., Borisenko N.G., Demchenko N.N., Gus’kov S.Yu., Klir D., Kmetik V., Liska R., Masek K., Merkul’ev Yu.A., Pfeifer M., Sinor M., Ullschmied J.: : Laser Interactions with Low-Density Foams for Laser Beam Smoothing and X-ray Source Studies,. 34th EPS Conference on Plasma Physics, Warsaw, 2-6 July 2007, ECA, Vol. 31F, O4.006 (2007).

[112] Limpouch J., Renner O., Borisenko N.G., Klír D., Kmetík V., Krouský E., Liska R., Mašek K., Nazarov W., Ullschmied J.: : Applications of lowdensity foams for X-ray source studies and laser beam smoothing,. Inertial Fusion Science and Applications, Kobe, Japan, 9.-14 September 2007, paper

TuPo75, Book of Abstracts, p. 197

Part II - PHYSICS

[113] Renner O., Limpouch J., Krousky E., Klimo O., Klir D., Liska R., Nazarov W., Borisenko N.G., Ullschmied J.: : Spectroscopic investigation of laser energy deposition in low-density foams.. 3rd Moscow Workshop on Targets and Applications, Moscow, October 15 - 19, 2007.

[114] Limpouch J.: : Laser interactions with underdense foams for laser beam and ablation pressure smoothing, (invited paper).. 5th Workshop on Direct-Drive and Fast Ignitron Physics, Madrid, 2-4 April 2007 [115] Zebrowski J., Jakubowski L., Sadowski M.J., Malinowski K., Jakubowski M., Weinzettl V., Stockel J., Vacha M., Peterka M.: Diagnostics of Fast Electrons within Castor Tokamak by Means of a Modified Cherenkov-Type Probe. PLASMA 2007 – International Conference on Research and Applications of Plasmas, Greifswald, Germany, October 16-19, 2007 WeP3 [116] Jakubowski L., Sadowski M.J., Stanislawski J., Malinowski K., Zebrowski

J., Jakubowski M., Weinzettl V., Stockel J., Vacha M., Peterka M.:

Cherenkov Detectors For Measurements Of Fast Electrons In CASTORTokamak. 17th IAEA Technical Meeting on Research Using Small Fusion Devices, Lisbon, Portugal, October 22-24, 2007 P17 [117] Bohm P., Brotankova J., Weinzettl V., Aftanas M., Belsky P., Barth R., van der Meiden H.: Design of new Thomson scattering diagnostics for COMPASS-D tokamak. 8th Carolus Magnus Summer School on Plasma and Fusion Energy Physics, Bad Honnef, Germany, September 3 – 14, 2007 [118] Feketeova L., Tepnual T., Grill V., Scheier P., Roithová J., Herman Z., Märk T.D.: Surface-induced dissociation and reactions of cations and dications C7H8+/2+, C7H7+/2+ and C7H62+: Dependence of mass spectra of product ions on incident energy of the projectiles. International Journal of Mass Spectrometry 265 (2007) 337-346 [119] Marek A. : Low temperature plasma at intermediate pressures and in the magnetic field experiment and model. Ph.D. Thesis Charles University in Prague (2007) [120] Neto A., Fernandes H., Duarte A., Carvalho B.B., Sousa J., Valcárcel D.F., Hron M., Varandas C.A.F.: FireSignal—Data acquisition and control system software. Fusion Engineering and Design 82 (2007) 1359–1364 [121] Neto A., Fernandes H., Alves D., Valcárcel D.F., Carvalho B.B., Ferreira J., Vega J., Sánchez E., Pena A., Hron M., Varandas C.A.F.: A standard data access layer for fusion devices R&D programs. Fusion Engineering and Design 82 (2007) 1315–1320

–  –  –

The radial profiles of fully ionised carbon C6+ (transition n=8-7, 529.1 nm) released from TCV (R = 0.88 m, a0.25m, BT1.5 T) wall tiles were measured using active Charge eXchange Recombination Spectroscopy (CXRS). A 1D impurity transport model was used to infer carbon transport parameters from the steady state profiles of fully ionised carbon. In Ohmically heated plasmas at values of q954 a phenomenon of core impurity enrichment. A modest addition of EC Heating in L-mode leads to the flattening of electron density profile and is accompanied by peaked-hollow carbon density profile with clear anomalous origin.

Experimental observations The TCV vessel wall is entirely covered by polycristalline carbon tiles, making carbon the dominant impurity in TCV. TCV is equipped with a diagnostic neutral beam operating at 50keV, delivering approximately 1.6×1019 H neutrals per second to the plasma. Ion temperature, toroidal rotation and carbon density profiles are obtained using a multiple chord visible spectrometer tuned to the n=8-7 charge exchange transition of C+5. The instrument is absolutely calibrated using an integrating sphere. The density of the C6+ along the line of sight was obtained by integrating the fitted active component of the signal corrected for the neutral beam attenuation and the changes of CX rate coefficient along the beam.

–  –  –

Part II - PHYSICS accompanied by peaked-hollow carbon profile with clear anomalous origin.

Electron density profiles in TCV in the Ohmic phase are peaked. The Ware pinch and anomalous convective process like turbulent equipartition (TEP) and turbulent thermodiffusion (TTD) mechanisms may contribute to the shaping of the electron density profiles.

Which of the mechanism plays an important role in carbon density profile forming is unknown yet. An example of carbon density profile behaviour L-mode we demonstrate in Fig.1. At the beginning of discharge (shot 34441, Ip=140 kA, without EC Heating), during the OH plasma phase a core impurity enrichment is observed, and more, the normalized nc profile is almost the same as normalized te profile!

The presence of EC Heating leads to a flattering of the electron density profile. The dependence of the profile width in Ohmic target plasma is modified in ECH discharges by an additional dependence on deposition localisation – central heating results in profile broadening.

The modest addition of EC Heating in L-mode causes the broadening of electron density profile and consequently a peaked-hollow carbon density profile is observed. Evidently, such examples provide an experimental elements for validating comprehensive turbulent light-impurity transport models. In Fig.2, experimental electron density (ne) lines) profiles during the off-axis heating (400kW) in L-mode by Ip=140kA in shot=34441.and fully-ionized carbon density (nc) together with electron temperature (te) profiles versus (rho) are shown during the off-axis EC Heating (400kW) in Lmode by Ip=140kA in shot = 34441. Profiles are normalized to the values at the centre.

Fig.3 A demonstration example of possible creation of the C6+ hollow profile by simple modelling (five iterative steps) in L-modes with off-axis heating. Calculated radial C6+ density profile by STRAHL (green line). Fitted are experimental measured ne (red lines) and Te (blue lines)

The experimental and theoretical investigation will be continued with the goals:

• Provides an experimental element for validating comprehensive turbulent transport models.

• Characterise carbon density profiles from CXRS with off-axis ECH in L-mode to complete study undertaken in 2007.

• Characterise transport of Carbon species in same conditions.

–  –  –

In collaboration with:

V. Rohde, W. Müller, A. Herrmann, EURATOM-IPP, Garching, Germany;

R. Schrittwieser, C. Ionita, F. Mehlmann, EURATOM-ÖAW, Innsbruck, Austria;

The direct measurements of the plasma potential have been performed on ASDEX Upgrade tokamak in June 2007. It has been used a novel design of the ball-pen probe combined with the carbon shield. The ball-pen probe head has been mounted on the reciprocating manipulator located at the midplane. The probe has been exposed in the edge plasma a few millimeters outside the limiter shadow on the low field side. The measurements have been performed in the H-mode and Ohmic regime.



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