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26 results on '"Bedacht, S."'

1. Fabrication and characterization of thin polymer targets for laser-driven ion acceleration

Author

Tebartz, A., Bedacht, S., Schaumann, G., Roth, M., Tebartz, A., Bedacht, S., Schaumann, G., and Roth, M.

Abstract

Polymer foils with thicknesses 150 nm to around 1 µm were manufactured using the process of spincoating. Varying the concentration of the polymer solution was found to be the most efficient way to control resulting foil thickness. Both interferometric microscopy and energy loss of alpha particles were used for characterization and found to yield agreeing results. For an experiment on laser-driven ion acceleration, these films were used as targets and as substrates for cryogenic hydrogen targets.

Published
2024

2. In-situ formation of solidified hydrogen thin-membrane targets using a pulse tube cryocooler

Author

Astbury, S., Bedacht, S., Brummitt, P., Carroll, D., Clarke, R., Crisp, S., Hernandez-Gomez, C., Holligan, P., Hook, S., Merchan, J. S., Neely, D., Ortner, A., Rathbone, D., Rice, P., Schaumann, G., Scott, G., Spindloe, C., Spurdle, S., Tebartz, A., Tomlinson, S., Wagner, F., Borghesi, M., Roth, M., Tolley, M. K., Astbury, S., Bedacht, S., Brummitt, P., Carroll, D., Clarke, R., Crisp, S., Hernandez-Gomez, C., Holligan, P., Hook, S., Merchan, J. S., Neely, D., Ortner, A., Rathbone, D., Rice, P., Schaumann, G., Scott, G., Spindloe, C., Spurdle, S., Tebartz, A., Tomlinson, S., Wagner, F., Borghesi, M., Roth, M., and Tolley, M. K.

Abstract

An account is given of the Central Laser Facility's work to produce a cryogenic hydrogen targetry system using a pulse tube cryocooler. Due to the increasing demand for low Z thin laser targets, CLF (in collaboration with TUD) have been developing a system which allows the production of solid hydrogen membranes by engineering a design which can achieve this remotely; enabling the gas injection, condensation and solidification of hydrogen without compromising the vacuum of the target chamber. A dynamic sealing mechanism was integrated which allows targets to be grown and then remotely exposed to open vacuum for laser interaction. Further research was conducted on the survivability of the cryogenic targets which concluded that a warm gas effect causes temperature spiking when exposing the solidified hydrogen to the outer vacuum. This effect was shown to be mitigated by improving the pumping capacity of the environment and reducing the minimum temperature obtainable on the target mount. This was achieved by developing a two-stage radiation shield encased with superinsulating blanketing; reducing the base temperature from 14 ± 0.5 K to 7.2 ± 0.2 K about the coldhead as well as improving temperature control stability following the installation of a high-performance temperature controller and sensor apparatus. The system was delivered experimentally and in July 2014 the first laser shots were taken upon hydrogen targets in the Vulcan TAP facility.

Published
2024

3. Simulations of the energy loss of ions at the stopping-power maximum in a laser-induced plasma

Author

Cayzac, W., Frank, A., Ortner, A., Bagnoud, V., Basko, M.M., Bedacht, S., Blažević, A., Deppert, O., Gericke, D.O., Hallo, L., Knetsch, A., Kraus, D., Malka, G., Pépitone, K., Schaumann, G., Schlegel, T., Schumacher, D., Tauschwitz, An., Vorberger, J., Wagner, F., Roth, M., Cayzac, W., Frank, A., Ortner, A., Bagnoud, V., Basko, M.M., Bedacht, S., Blažević, A., Deppert, O., Gericke, D.O., Hallo, L., Knetsch, A., Kraus, D., Malka, G., Pépitone, K., Schaumann, G., Schlegel, T., Schumacher, D., Tauschwitz, An., Vorberger, J., Wagner, F., and Roth, M.

Abstract

Simulations have been performed to study the energy loss of carbon ions in a hot, laser-generated plasma in the velocity region of the stopping-power maximum. In this parameter range, discrepancies of up to 30% exist between the various stopping theories and hardly any experimental data are available. The considered plasma, created by irradiating a thin carbon foil with two high-energy laser beams, is fully-ionized with a temperature of nearly 200 eV. To study the interaction at the maximum stopping power, Monte-Carlo calculations of the ion charge state in the plasma are carried out at a projectile energy of 0.5 MeV per nucleon. The predictions of various stopping-power theories are compared and experimental campaigns are planned for a first-time theory benchmarking in this low-velocity range.

Published
2024

6. Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Author

Cayzac, W., Frank, A., Ortner, A., Bagnoud, V., Basko, M. M., Bedacht, S., Bläser, C., Blazevic, A., Busold, S., Deppert, O., Ding, J., Ehret, M., Fiala, P., Frydrych, S., Gericke, D. O., Hallo, L., Helfrich, J., Jahn, D., Kjartansson, E., Knetsch, A., Kraus, D., Malka, G., Neumann, N., Pepitone, K., Pepler, D., Sander, S., Schaumann, G., Schlegel, T., Schroeter, N., Schumacher, D., Seibert, M., Tauschwitz, A., Vorberger, J., Wagner, F., Weih, S., Zobus, Y., Roth, M., Cayzac, W., Frank, A., Ortner, A., Bagnoud, V., Basko, M. M., Bedacht, S., Bläser, C., Blazevic, A., Busold, S., Deppert, O., Ding, J., Ehret, M., Fiala, P., Frydrych, S., Gericke, D. O., Hallo, L., Helfrich, J., Jahn, D., Kjartansson, E., Knetsch, A., Kraus, D., Malka, G., Neumann, N., Pepitone, K., Pepler, D., Sander, S., Schaumann, G., Schlegel, T., Schroeter, N., Schumacher, D., Seibert, M., Tauschwitz, A., Vorberger, J., Wagner, F., Weih, S., Zobus, Y., and Roth, M.

Abstract

The energy deposition of ions in dense plasmas is a key process in inertial confinement fusion that determines the alpha-particle heating expected to trigger a burn wave in the hydrogen pellet and the resulting thermonuclear gain. However, measurements of ion stopping in plasmas are scarce and mostly restricted to high ion velocities where the theory agrees with data. Here, we report experimental data at low projectile velocities where the stopping force reaches its maximum (Bragg peak). This parameter range features the largest theoretical uncertainties and conclusive data are missing until today. The precision of our measurements, combined with a reliable knowledge of the plasma parameters, allows to clearly rule out several standard models for the stopping power for beam velocities typically encountered in inertial fusion. On the other hand, our data support theories that include a detailed treatment of strong ion-electron collisions.

Published
2017

8. Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Author

Cayzac, W., primary, Frank, A., additional, Ortner, A., additional, Bagnoud, V., additional, Basko, M. M., additional, Bedacht, S., additional, Bläser, C., additional, Blažević, A., additional, Busold, S., additional, Deppert, O., additional, Ding, J., additional, Ehret, M., additional, Fiala, P., additional, Frydrych, S., additional, Gericke, D. O., additional, Hallo, L., additional, Helfrich, J., additional, Jahn, D., additional, Kjartansson, E., additional, Knetsch, A., additional, Kraus, D., additional, Malka, G., additional, Neumann, N. W., additional, Pépitone, K., additional, Pepler, D., additional, Sander, S., additional, Schaumann, G., additional, Schlegel, T., additional, Schroeter, N., additional, Schumacher, D., additional, Seibert, M., additional, Tauschwitz, An., additional, Vorberger, J., additional, Wagner, F., additional, Weih, S., additional, Zobus, Y., additional, and Roth, M., additional

Published
2017
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9. Ion energy loss in plasma beyond the linear interaction regime

Author

Cayzac, W. A., Ortner, A., Bagnoud, V., Basko, M., Bedacht, S., Blazevic, A., Busold, S., Deppert, O., Ehret, M., Faik, S., Frank, A., Gericke, D., Hallo, L., Helfrich, J., Kjartansson, E., Knetsch, A., Kraus, D., Malka, G., Pepitone, K., Rienecker, T., Schaumann, G., Schumacher, D., Tauschwitz, Anna, Vorberger, J., Wagner, F., and Roth, Markus

Subjects
Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015

10. Shaping laser accelerated ions for future applications – The LIGHT collaboration

Author

Busold, S., Almomani, A., Bagnoud, V., Barth, W., Bedacht, S., Blažević, A., Boine-Frankenheim, O., Brabetz, C., Burris-Mog, T., Cowan, T. E., Deppert, O., Droba, M., Eickhoff, H., Eisenbarth, U., Harres, K., Hoffmeister, G., Hofmann, I., Jaeckel, O., Jaeger, R., Joost, M., Kraft, S., Kroll, F., Kaluza, M., Kester, O., Lecz, Z., Merz, T., Nürnberg, F., Al-Omari, H., Orzhekhovskaya, A., Paulus, G., Polz, J., Ratzinger, U., Roth, M., Schaumann, G., Schmidt, P., Schramm, U., Schreiber, G., Schumacher, D., Stoehlker, T., Tauschwitz, A., Vinzenz, W., Wagner, F., Yaramyshev, S., and Zielbauer, B.

Subjects
Physics::Plasma Physics, Acceleration, Physics::Accelerator Physics, Laser, Proton, Ion
Abstract

The generation of intense ion beams from high-intensity laser-generated plasmas has been the focus of research for the last decade. In the LIGHT collaboration the expertise of heavy ion accelerator scientists and laser and plasma physicists has been combined to investigate the prospect of merging these ion beams with conventional accelerator technology and exploring the possibilities of future applications. We report about the goals and first results of the LIGHT collaboration to generate, handle and transport laser driven ion beams. This effort constitutes an important step in research for next generation accelerator technologies.

Published
2014

12. Laser-driven Ion Acceleration with Cryogenic Hydrogen Targets

Author

Bedacht, S., Deppert, Oliver, Geschwind, S., Jaeger, R., Kleinschmidt, A., Mertins, F., Ortner, A., Schanz, V., Schaumann, G., Tebartz, A., Wagner, F., Zielbauer, B., Bagnoud, V., Roth, M., and Hoffmann, D. H. H.

Subjects
Physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, 010305 fluids & plasmas
Abstract

GSI Scientific Report 2013 - GSI Report 2014-1

Published
2014

14. In-situ formation of solidified hydrogen thin-membrane targets using a pulse tube cryocooler

Author

Astbury, S, primary, Bedacht, S, additional, Brummitt, P, additional, Carroll, D, additional, Clarke, R, additional, Crisp, S, additional, Hernandez-Gomez, C, additional, Holligan, P, additional, Hook, S, additional, Merchan, J S, additional, Neely, D, additional, Ortner, A, additional, Rathbone, D, additional, Rice, P, additional, Schaumann, G, additional, Scott, G, additional, Spindloe, C, additional, Spurdle, S, additional, Tebartz, A, additional, Tomlinson, S, additional, Wagner, F, additional, Borghesi, M, additional, Roth, M, additional, and Tolley, M K, additional

Published
2016
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16. A novel experimental setup for energy loss and charge state measurements in dense moderately coupled plasma using laser-heated hohlraum targets

Author

Ortner, A., primary, Schumacher, D., additional, Cayzac, W., additional, Frank, A., additional, Basko, M.M., additional, Bedacht, S., additional, Blazevic, A., additional, Faik, S., additional, Kraus, D., additional, Rienecker, T., additional, Schaumann, G., additional, Tauschwitz, An., additional, Wagner, F., additional, and Roth, M., additional

Published
2016
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17. Simulations of the energy loss of ions at the stopping-power maximum in a laser-induced plasma

Author

Cayzac, W., primary, Frank, A., additional, Ortner, A., additional, Bagnoud, V., additional, Basko, M.M., additional, Bedacht, S., additional, Blažević, A., additional, Deppert, O., additional, Gericke, D.O., additional, Hallo, L., additional, Knetsch, A., additional, Kraus, D., additional, Malka, G., additional, Pépitone, K., additional, Schaumann, G., additional, Schlegel, T., additional, Schumacher, D., additional, Tauschwitz, An., additional, Vorberger, J., additional, Wagner, F., additional, and Roth, M., additional

Published
2016
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20. Shaping laser accelerated ions for future applications – The LIGHT collaboration

Author

Busold, S., primary, Almomani, A., additional, Bagnoud, V., additional, Barth, W., additional, Bedacht, S., additional, Blažević, A., additional, Boine-Frankenheim, O., additional, Brabetz, C., additional, Burris-Mog, T., additional, Cowan, T.E., additional, Deppert, O., additional, Droba, M., additional, Eickhoff, H., additional, Eisenbarth, U., additional, Harres, K., additional, Hoffmeister, G., additional, Hofmann, I., additional, Jaeckel, O., additional, Jaeger, R., additional, Joost, M., additional, Kraft, S., additional, Kroll, F., additional, Kaluza, M., additional, Kester, O., additional, Lecz, Z., additional, Merz, T., additional, Nürnberg, F., additional, Al-Omari, H., additional, Orzhekhovskaya, A., additional, Paulus, G., additional, Polz, J., additional, Ratzinger, U., additional, Roth, M., additional, Schaumann, G., additional, Schmidt, P., additional, Schramm, U., additional, Schreiber, G., additional, Schumacher, D., additional, Stoehlker, T., additional, Tauschwitz, A., additional, Vinzenz, W., additional, Wagner, F., additional, Yaramyshev, S., additional, and Zielbauer, B., additional

Published
2014
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21. High energy ion acceleration and neutron production using relativistic transparency in solids

Author

Roth, M., primary, Jung, D., additional, Falk, K., additional, Guler, N., additional, Bagnoud, V., additional, Bedacht, S., additional, Deppert, O., additional, Devlin, M., additional, Favalli, A., additional, Fernandez, J., additional, Gautier, D., additional, Geissel, M., additional, Haight, R., additional, Hamilton, C. E., additional, Hegelich, B. M., additional, Johnson, R. P., additional, Kleinschmidt, A., additional, Merrill, F., additional, Ortner, A., additional, Schaumann, G., additional, Schoenberg, K., additional, Schollmeier, M., additional, Shimada, T., additional, Taddeucci, T., additional, Tebartz, A., additional, Tybo, J. L., additional, Wagner, F., additional, Wender, S. A., additional, Wilde, C. H., additional, and Wurden, G. A., additional

Published
2014
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22. Numerical modelling of a 10-cm-long multi-GeV laser wakefield accelerator driven by a self-guided petawatt pulse

Author

Kalmykov, S Y, primary, Yi, S A, additional, Beck, A, additional, Lifschitz, A F, additional, Davoine, X, additional, Lefebvre, E, additional, Pukhov, A, additional, Khudik, V, additional, Shvets, G, additional, Reed, S A, additional, Dong, P, additional, Wang, X, additional, Du, D, additional, Bedacht, S, additional, Zgadzaj, R, additional, Henderson, W, additional, Bernstein, A, additional, Dyer, G, additional, Martinez, M, additional, Gaul, E, additional, Ditmire, T, additional, and Downer, M C, additional

Published
2010
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23. High energy ion acceleration and neutron production using relativistic transparency in solids

Author

Roth, M., Jung, D., Falk, K., Guler, N., Bagnoud, V., Bedacht, S., Deppert, O., Matthew Devlin, Favalli, A., Fernandez, J., Gautier, D., Geissel, M., Haight, R., Hamilton, C. E., Hegelich, B. M., Johnson, R. P., Kleinschmidt, A., Merrill, F., Ortner, A., Schaumann, G., Schoenberg, K., Schollmeier, M., Shimada, T., Taddeucci, T., Tebartz, A., Tybo, J. L., Wagner, F., Wender, S. A., Wilde, C. H., Wurden, G. A., and IEEE

25. Creation and characterization of free-standing cryogenic targets for laser-driven ion acceleration.

Author

Tebartz A, Bedacht S, Hesse M, Astbury S, Clarke R, Ortner A, Schaumann G, Wagner F, Neely D, and Roth M

Abstract

A technique for the creation of free-standing cryogenic targets for laser-driven ion acceleration is presented, which allows us to create solid state targets consisting of initially gaseous materials. In particular, the use of deuterium and the methods for its preparation as a target material for laser-driven ion acceleration are discussed. Moving in the phase diagram through the liquid phase leads to the substance covering an aperture on a cooled copper frame where it is solidified through further cooling. An account of characterization techniques for target thickness is given, with a focus on deducing thickness values from distance values delivered by chromatic confocal sensors.

Published
2017
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26. Pre-plasma formation in experiments using petawatt lasers.

Author

Wagner F, Bedacht S, Ortner A, Roth M, Tauschwitz A, Zielbauer B, and Bagnoud V

Subjects
Computer Simulation, Image Processing, Computer-Assisted, Static Electricity, Time Factors, Electricity, Lasers, Plasma Gases chemistry
Abstract

We used time-resolved shadowgraphy to characterize the pre-plasma formation in solid-target interaction experiments with micrometer-scale accuracy. We performed quantitative measurements of the plasma density for amplified spontaneous emission (ASE) levels ranging from 2 · 10(-7) to 10(-10) backed with 2-dimensional hydrodynamic simulations. We find that ASE levels above 10(-9) are able to create a significant pre-plasma plume that features a plasma canal driving a self-focusing of the laser beam. For ASE levels of 10(-10), no ASE pre-plasma could be detected.

Published
2014
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