Search

Your search keyword '"Cervenak, M."' showing total 9 results
Start Over Author "Cervenak, M."
9 results on '"Cervenak, M."'

1. Radiative characterization of supersonic jets and shocks in a laser-plasma experiment

Author

Bohlin, H, Brack, F-E, Cervenak, M, Chodukowski, T, Cikhardt, J, Dostál, J, Dudžák, R, Hubner, J., Huo, W, Jelinek, S, Klír, D, Kroll, F, Krupka, M, Krůs, M, Pisarczyk, T, Rusiniak, Z, Schlegel, T, Schramm, U., Nguyen-Bui, T-H, Weber, S, Zaraś-Szydłowska, A, Zeil, K, Kumar, D, and Tikhonchuk, V

Subjects
Physics - Plasma Physics
Abstract

The interaction of supersonic laser-generated plasma jets with a secondary gas target was studied experimentally. The plasma parameters of the jet, and the resulting shock, were characterized using a combination of multi-frame interferometry/shadowgraphy, and X-ray diagnostics, allowing for a detailed study of their structure and evolution. The velocity was obtained with an X-ray streak camera, and filtered X-ray pinhole imaging was used to infer the electron temperature of the jet and shock. The topology of the ambient plasma density was found to have a significant effect on the jet and shock formation, as well as on their radiation characteristics. The experimental results were compared with radiation hydrodynamic simulations, thereby providing further insights into the underlying physical processes of the jet and shock formation and evolution.

Published
2020
Full Text
View/download PDF

2. A novel multi-shot target platform for laser-driven laboratory astrophysics experiments

Author

(0000-0002-2767-9995) Perez-Martin, P., (0000-0003-0931-1350) Prencipe, I., Sobiella, M., Donat, F., Kang, N., He, Z., Liu, H., Ren, L., Xie, Z., Xiong, J., Zhang, Y., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Gajdos, P., Hronova, L., Kaniz, K., (0000-0003-4757-9972) Kozlová, M., (0000-0002-0275-9892) Kroll, F., (0000-0002-3882-510X) Pan, X., Schaumann, G., Singh, S., (0000-0002-7162-7500) Smid, M., Suzuki-Vidal, F., Zhang, P., Sun, J., Zhu, J., Krus, M., (0000-0001-5975-776X) Falk, K., (0000-0002-2767-9995) Perez-Martin, P., (0000-0003-0931-1350) Prencipe, I., Sobiella, M., Donat, F., Kang, N., He, Z., Liu, H., Ren, L., Xie, Z., Xiong, J., Zhang, Y., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Gajdos, P., Hronova, L., Kaniz, K., (0000-0003-4757-9972) Kozlová, M., (0000-0002-0275-9892) Kroll, F., (0000-0002-3882-510X) Pan, X., Schaumann, G., Singh, S., (0000-0002-7162-7500) Smid, M., Suzuki-Vidal, F., Zhang, P., Sun, J., Zhu, J., Krus, M., and (0000-0001-5975-776X) Falk, K.

Abstract

Anewapproach to target development for laboratory astrophysics experiments at high power laser facilities is presented. With the dawnofhighpowerlasers, laboratory astrophysics emerged as a field, bringing insight into physical processes in astrophysical objects, such as formation of stars. An important factor for success on these experiments is targetry. To date, targets have mainly relied on expensive and challenging microfabrication methods. The design presented incorporates replaceable machined parts which assemble into a structure that defines the experimental geometry. This can make targets cheaper and faster to manufacture, while maintaining robustness and reproducibility. The platform is intended for experiments on plasma flows, but it is flexible and may be adapted to the constraints of other experimental setups. Examples of targets used in experimental campaigns are shown, including a design for insertion in a high magnetic field coil. Experimental results are included demonstrating the performance of the targets.

Published
2023

3. Laser-generated supersonic plasma jets and shocks in a transverse magnetic field

Author

Bohlin, H., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Chodukowski, T., Cikhardt, J., Dostál, J., Dudžák, R., Hubner, J., Huo, W., Jelinek, S., Klír, D., (0000-0002-0275-9892) Kroll, F., Krupka, M., Krůs, M., Pisarczyk, T., Rusiniak, Z., (0000-0003-0390-7671) Schramm, U., T.-H, N.-B., Weber, S., Zaraś-Szydłowska, A., (0000-0003-3926-409X) Zeil, K., Kumar, D., Schlegel, T., Tikhonchuk, V., Bohlin, H., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Chodukowski, T., Cikhardt, J., Dostál, J., Dudžák, R., Hubner, J., Huo, W., Jelinek, S., Klír, D., (0000-0002-0275-9892) Kroll, F., Krupka, M., Krůs, M., Pisarczyk, T., Rusiniak, Z., (0000-0003-0390-7671) Schramm, U., T.-H, N.-B., Weber, S., Zaraś-Szydłowska, A., (0000-0003-3926-409X) Zeil, K., Kumar, D., Schlegel, T., and Tikhonchuk, V.

Abstract

The influence of a transverse magnetic field on the formation and evolution of supersonic plasma jets and shocks was studied experimentally, and compared with 3D numerical simulations. An improved jet collimation was seen due to the change in the magnetic field topology restricting the radial expansion of the ablated plasma. The magnetic field was also shown to strongly affect the shock structures, both indirectly through the modified jet geometry, as well as due to a compression of the field lines in the shock region. The interaction characteristics were found to depend on the relative contribution of the magnetic and plasma pressure in balancing the ram pressure of the jet.

Published
2022

4. Radiative characterization of supersonic jets and shocks in a laser-plasma experiment

Author

(0000-0001-6637-5460) Bohlin, H., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Chodukowski, T., (0000-0002-8222-8038) Cikhardt, J., Dostál, J., Dudžák, R., Hubner, J., Huo, W., (0000-0002-1999-811X) Jelinek, S., (0000-0002-0510-3653) Klír, D., (0000-0002-0275-9892) Kroll, F., Krupka, M., Krůs, M., (0000-0002-1109-7683) Pisarczyk, T., Rusiniak, Z., (0000-0003-0390-7671) Schramm, U., T.-H, N.-B., (0000-0003-3154-9306) Weber, S., Zaraś-Szydłowska, A., (0000-0003-3926-409X) Zeil, K., (0000-0002-7225-0549) Kumar, D., Schlegel, T., (0000-0001-7532-5879) Tikhonchuk, V., (0000-0001-6637-5460) Bohlin, H., (0000-0002-9859-2408) Brack, F.-E., Cervenak, M., Chodukowski, T., (0000-0002-8222-8038) Cikhardt, J., Dostál, J., Dudžák, R., Hubner, J., Huo, W., (0000-0002-1999-811X) Jelinek, S., (0000-0002-0510-3653) Klír, D., (0000-0002-0275-9892) Kroll, F., Krupka, M., Krůs, M., (0000-0002-1109-7683) Pisarczyk, T., Rusiniak, Z., (0000-0003-0390-7671) Schramm, U., T.-H, N.-B., (0000-0003-3154-9306) Weber, S., Zaraś-Szydłowska, A., (0000-0003-3926-409X) Zeil, K., (0000-0002-7225-0549) Kumar, D., Schlegel, T., and (0000-0001-7532-5879) Tikhonchuk, V.

Abstract

The interaction of supersonic laser-generated plasma jets with a secondary gas target was studied experimentally. The plasma parameters of the jet, and the resulting shock, were characterized using a combination of multi-frame interferometry/shadowgraphy, and x-ray diagnostics, allowing for a detailed study of their structure and evolution. The velocity was obtained with an x-ray streak camera, and filtered x-ray pinhole imaging was used to infer the electron temperature of the jet and shock. The topology of the ambient plasma density was found to have a significant effect on the jet and shock formation, as well as on their radiation characteristics. The experimental results were compared with radiation hydrodynamic simulations, thereby providing further insights into the underlying physical processes of the jet and shock formation and evolution.

Published
2021

5. Laser-generated supersonic plasma jets and shocks in a transverse magnetic field.

Author

Bohlin, H, Brack, F-E, Cervenak, M, Chodukowski, T, Cikhardt, J, Dostál, J, Dudžák, R, Hubner, J, Huo, W, Jelinek, S, KlĂ-r, D, Kroll, F, Krupka, M, KrĹŻs, M, Pisarczyk, T, Rusiniak, Z, Schramm, U, Nguyen-Bui, T-H, Weber, S, and ZaraĹ›-SzydĹ‚owska, A

Subjects
PLASMA jets, MAGNETIC fields, PLASMA pressure, LASER plasmas
Abstract

The influence of a transverse magnetic field on the formation and evolution of supersonic plasma jets and shocks was studied experimentally, and compared with 3D numerical simulations. An improved jet collimation was seen due to the change in the magnetic field topology restricting the radial expansion of the ablated plasma. The magnetic field was also shown to strongly affect the shock structures, both indirectly through the modified jet geometry, as well as due to a compression of the field lines in the shock region. The interaction characteristics were found to depend on the relative contribution of the magnetic and plasma pressure in balancing the ram pressure of the jet. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

6. Radiative characterization of supersonic jets and shocks in a laser-plasma experiment

Author

Bohlin, H, primary, Brack, F-E, additional, Cervenak, M, additional, Chodukowski, T, additional, Cikhardt, J, additional, Dostál, J, additional, Dudžák, R, additional, Hubner, J, additional, Huo, W, additional, Jelinek, S, additional, Klír, D, additional, Kroll, F, additional, Krupka, M, additional, Krůs, M, additional, Pisarczyk, T, additional, Rusiniak, Z, additional, Schramm, U, additional, Nguyen-Bui, T-H, additional, Weber, S, additional, Zaraś-Szydłowska, A, additional, Zeil, K, additional, Kumar, D, additional, Schlegel, T, additional, and Tikhonchuk, V, additional

Published
2021
Full Text
View/download PDF

7. X-ray time-resolved diagnostics of hot electron generation in shock ignition relevant experiments

Author

Filippov, E.D., primary, Martynenko, A.S., additional, Cervenak, M., additional, Antonelli, L., additional, Baffigi, F., additional, Cristoferetti, G., additional, Gizzi, L.A., additional, Pisarczyk, T., additional, Mancelli, D., additional, Ospina, V., additional, Krus, M., additional, Dudzak, R., additional, Pikuz, S.A., additional, Batani, D., additional, and Renner, O., additional

Published
2020
Full Text
View/download PDF

9. Stabilization of G-Quadruplex Structures of the SARS-CoV-2 Genome by TMPyP4, BRACO19, and PhenDC3.

Author

Cervenak M, Molnár OR, Horváth P, and Smeller L

Subjects
Humans, SARS-CoV-2, COVID-19, G-Quadruplexes, Fused-Ring Compounds, Acridines, Porphyrins
Abstract

The G-quadruplex is one of the non-canonical structures formed by nucleic acids, which can be formed by guanine-rich sequences. They became the focus of much research when they were found in several oncogene promoter regions and also in the telomeres. Later on, they were discovered in viruses as well. Various ligands have been developed in order to stabilize DNA G-quadruplexes, which were believed to have an anti-cancer or antiviral effect. We investigated three of these ligands, and whether they can also affect the stability of the G-quadruplex-forming sequences of the RNA genome of SARS-CoV-2. All three investigated oligonucleotides showed the G-quadruplex form. We characterized their stability and measured their thermodynamic parameters using the Förster resonance energy transfer method. The addition of the ligands caused an increase in the unfolding temperature, but this effect was smaller compared to that found earlier in the case of G-quadruplexes of the hepatitis B virus, which has a DNA genome.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results