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Ambrožová I, Chvátil D, Cimmino A, Motta S, Olšanský V, Olšovcová V, Truneček R, Šolc J, Velyhan A, Versaci R. CHARACTERIZATION OF OSL AND TL DOSIMETERS WITH DATA COLLECTED AT THE MT25 CYCLIC ELECTRON ACCELERATOR. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)01709-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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2
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Cikhardt J, Krása J, De Marco M, Pfeifer M, Velyhan A, Krouský E, Cikhardtová B, Klír D, Rezáč K, Ullschmied J, Skála J, Kubeš P, Kravárik J. Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS. Rev Sci Instrum 2014; 85:103507. [PMID: 25362393 DOI: 10.1063/1.4898016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Measurements of the return-current flowing through a solid target irradiated with the sub-nanosecond kJ-class Prague Asterix Laser System is reported. A new inductive target probe was developed which allows us measuring the target current derivative in a kA/ns range. The dependences of the target current on the laser pulse energy for cooper, graphite, and polyethylene targets are reported. The experiment shows that the target current is proportional to the deposited laser energy and is strongly affected by the shot-to-shot fluctuations. The corresponding maximum target charge exceeded a value of 10 μC. A return-current dependence of the electromagnetic pulse produced by the laser-target interaction is presented.
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Affiliation(s)
- J Cikhardt
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
| | - J Krása
- Institute of Physics AS CR, 182 21 Prague, Czech Republic
| | - M De Marco
- Institute of Physics AS CR, 182 21 Prague, Czech Republic
| | - M Pfeifer
- Institute of Physics AS CR, 182 21 Prague, Czech Republic
| | - A Velyhan
- Institute of Physics AS CR, 182 21 Prague, Czech Republic
| | - E Krouský
- Institute of Physics AS CR, 182 21 Prague, Czech Republic
| | - B Cikhardtová
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
| | - D Klír
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
| | - K Rezáč
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
| | - J Ullschmied
- Institute of Plasma Physics AS CR, 182 00 Prague, Czech Republic
| | - J Skála
- Institute of Plasma Physics AS CR, 182 00 Prague, Czech Republic
| | - P Kubeš
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
| | - J Kravárik
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27 Prague, Czech Republic
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3
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Olšovcová V, Klír D, Krása J, Krůs M, Velyhan A, Zelenka Z, Rus B. Response of dosemeters in the radiation field generated by a TW-class laser system. Radiat Prot Dosimetry 2014; 161:343-346. [PMID: 24563524 DOI: 10.1093/rpd/ncu024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
State-of-the-art laser systems are able to generate ionising radiation of significantly high energies by focusing ultra-short and intense pulses onto targets. Thus, measures ensuring the radiation protection of both working personnel and the general public are required. However, commercially available dosemeters are primarily designed for measurement in continuous fields. Therefore, it is important to explore their response to very short pulses. In this study, the responses of dosemeters in a radiation field generated by iodine high-power and Ti:Sapphire laser systems are examined in proton and electron acceleration experiments. Within these experiments, electron bunches of femtosecond pulse duration and 100-MeV energy and proton bunches with sub-nanosecond pulse duration and energy of several megaelectronvolts were generated in single-shot regimes. Responses of typical detectors (TLD, films and electronic personal dosemeter) were analysed and compared. Further, a first attempt was carried out to characterise the radiation field generated by TW-class laser systems.
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Affiliation(s)
- V Olšovcová
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
| | - D Klír
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
| | - J Krása
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
| | - M Krůs
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
| | - A Velyhan
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
| | - Z Zelenka
- National Personal Dosimetry Service, Na Truhlářce 39/64, Prague 8, Prague, Czech Republic
| | - B Rus
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, Prague, Czech Republic
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4
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Prokůpek J, Kaufman J, Margarone D, Krůs M, Velyhan A, Krása J, Burris-Mog T, Busold S, Deppert O, Cowan TE, Korn G. Development and first experimental tests of Faraday cup array. Rev Sci Instrum 2014; 85:013302. [PMID: 24517754 DOI: 10.1063/1.4859496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A new type of Faraday cup, capable of detecting high energy charged particles produced in a high intensity laser-matter interaction environment, has recently been developed and demonstrated as a real-time detector based on the time-of-flight technique. An array of these Faraday cups was designed and constructed to cover different observation angles with respect to the target normal direction. Thus, it allows reconstruction of the spatial distribution of ion current density in the subcritical plasma region and the ability to visualise its time evolution through time-of-flight measurements, which cannot be achieved with standard laser optical interferometry. This is a unique method for two-dimensional visualisation of ion currents from laser-generated plasmas. A technical description of the new type of Faraday cup is introduced along with an ad hoc data analysis procedure. Experimental results obtained during campaigns at the Petawatt High-Energy Laser for Heavy Ion Experiments (GSI, Darmstadt) and at the Prague Asterix Laser System (AS CR) are presented. Advantages and limitations of the used diagnostic system are discussed.
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Affiliation(s)
- J Prokůpek
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - J Kaufman
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague 1, Czech Republic
| | - D Margarone
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - M Krůs
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - A Velyhan
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - J Krása
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - T Burris-Mog
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - S Busold
- Technische Universität Darmstadt (TUD), Schlossgartenstraße 9, D-64289 Darmstadt, Germany
| | - O Deppert
- Technische Universität Darmstadt (TUD), Schlossgartenstraße 9, D-64289 Darmstadt, Germany
| | - T E Cowan
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - G Korn
- Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic
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5
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Ceccotti T, Floquet V, Sgattoni A, Bigongiari A, Klimo O, Raynaud M, Riconda C, Heron A, Baffigi F, Labate L, Gizzi LA, Vassura L, Fuchs J, Passoni M, Květon M, Novotny F, Possolt M, Prokůpek J, Proška J, Pšikal J, Štolcová L, Velyhan A, Bougeard M, D'Oliveira P, Tcherbakoff O, Réau F, Martin P, Macchi A. Evidence of resonant surface-wave excitation in the relativistic regime through measurements of proton acceleration from grating targets. Phys Rev Lett 2013; 111:185001. [PMID: 24237527 DOI: 10.1103/physrevlett.111.185001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Indexed: 06/02/2023]
Abstract
The interaction of laser pulses with thin grating targets, having a periodic groove at the irradiated surface, is experimentally investigated. Ultrahigh contrast (~10(12)) pulses allow us to demonstrate an enhanced laser-target coupling for the first time in the relativistic regime of ultrahigh intensity >10(19) W/cm(2). A maximum increase by a factor of 2.5 of the cutoff energy of protons produced by target normal sheath acceleration is observed with respect to plane targets, around the incidence angle expected for the resonant excitation of surface waves. A significant enhancement is also observed for small angles of incidence, out of resonance.
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Affiliation(s)
- T Ceccotti
- CEA/IRAMIS/SPAM, F-91191 Gif-sur-Yvette, France
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6
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Limpouch J, Klimo O, Psikal J, Proska J, Novotny F, Margarone D, Velyhan A, Cutroneo M, Torrisi L. Efficient ion beam generation in laser interactions with micro-structured targets. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135917011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Batani D, Malka G, Schurtz G, Ribeyre X, Lebel E, Giuffrida L, Tikhonchuk V, Volpe L, Patria A, Koester P, Labate L, Gizzi LA, Antonelli L, Richetta M, Nejdl J, Sawicka M, Margarone D, Krus M, Krousky E, Skala J, Dudzak R, Velyhan A, Ullshmied J, Renner O, Smid M, Klimo O, Atzeni S, Marocchino A, Schiavi A, Spindloe C, O'Dell T, Vinci T, Wolowski J, Badziak J, Pysarcizck T, Rosinski M, Kalinowska Z, Chodukowski T. Preliminary results from recent experiments and future roadmap to Shock Ignition of Fusion Targets. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/399/1/012005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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8
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Velardi L, Krása J, Velyhan A, Nassisi V. Study of laser plasma emission from doped targets. Rev Sci Instrum 2012; 83:02B911. [PMID: 22380343 DOI: 10.1063/1.3673014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this work, the characteristics of laser plasma produced by ablation of pure and doped targets are studied. An excimer KrF laser was used to induce ablation. Pure Cu, Cu with 2% of Be, and Cu with 4% of Sn targets were ablated to evaluate the influence of these admixture on the emission of Cu ions. It was observed that the emission of ions exhibited a higher gain from the Cu∕Be and Cu∕Sn targets with respect to the pure Cu one. We also performed studied of ion velocity and charge angular distribution.
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Affiliation(s)
- L Velardi
- Department of Physics and I.N.F.N., University of Salento, LEAS Laboratory, Via Provinciale, Lecce-Monteroni, 73100 Lecce, Italy.
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9
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Margarone D, Krasa J, Prokupek J, Velyhan A, Torrisi L, Picciotto A, Giuffrida L, Gammino S, Cirrone P, Cutroneo M, Romano F, Serra E, Mangione A, Rosinski M, Parys P, Ryc L, Limpouch J, Laska L, Jungwirth K, Ullschmied J, Mocek T, Korn G, Rus B. New methods for high current fast ion beam production by laser-driven acceleration. Rev Sci Instrum 2012; 83:02B307. [PMID: 22380286 DOI: 10.1063/1.3669796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An overview of the last experimental campaigns on laser-driven ion acceleration performed at the PALS facility in Prague is given. Both the 2 TW, sub-nanosecond iodine laser system and the 20 TW, femtosecond Ti:sapphire laser, recently installed at PALS, are used along our experiments performed in the intensity range 10(16)-10(19) W∕cm(2). The main goal of our studies was to generate high energy, high current ion streams at relatively low laser intensities. The discussed experimental investigations show promising results in terms of maximum ion energy and current density, which make the laser-accelerated ion beams a candidate for new-generation ion sources to be employed in medicine, nuclear physics, matter physics, and industry.
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Affiliation(s)
- D Margarone
- Institute of Physics, ASCR, v.v.i.; PALS Centre, Prague, Czech Republic.
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10
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Krása J, Velyhan A, Margarone D, Krouský E, Krouský L, Jungwirth K, Rohlena K, Ullschmied J, Parys P, Ryć L, Wołowski J. Shot-to-shot reproducibility in the emission of fast highly charged metal ions from a laser ion source. Rev Sci Instrum 2012; 83:02B302. [PMID: 22380281 DOI: 10.1063/1.3655528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The generation of fast highly charged metal ions with the use of the sub-nanosecond Prague Asterix Laser System, operated at a fundamental wavelength of 1315 nm, is reported. Particular attention is paid to shot-to-shot reproducibility in the ion emission. Au and Pd targets were exposed to intensities up to 5 × 10(16) W∕cm(2). Above the laser intensity threshold of ∼3 × 10(14) W∕cm(2) the plasma is generated in a form of irregular bursts. The maximum energy of protons constituting the leading edge of the fastest burst reaches a value up to 1 MeV. The fast ions in the following bursts have energy gradually decreasing with the increasing burst number, namely, from a value of about 0.5 MeV∕charge regardless of the atomic number and mass of the ionized species.
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Affiliation(s)
- J Krása
- Institute of Physics, AS CR, v.v.i., 182 21 Prague 8, Czech Republic.
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11
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Torrisi L, Giuffrida L, Cutroneo M, Cirrone P, Picciotto A, Krasa J, Margarone D, Velyhan A, Laska L, Ullschmied J, Wolowski J, Badziak J, Rosinski M. Proton emission from thin hydrogenated targets irradiated by laser pulses at 10(16) W∕cm2. Rev Sci Instrum 2012; 83:02B315. [PMID: 22380294 DOI: 10.1063/1.3673506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The iodine laser at PALS Laboratory in Prague, operating at 1315 nm fundamental harmonics and at 300 ps FWHM pulse length, is employed to irradiate thin hydrogenated targets placed in vacuum at intensities on the order of 10(16) W∕cm(2). The laser-generated plasma is investigated in terms of proton and ion emission in the forward and backward directions. The time-of-flight technique, using ion collectors and semiconductor detectors, is used to measure the ion currents and the corresponding velocities and energies. Thomson parabola spectrometer is employed to separate the contribution of the ion emission from single laser shots. A particular attention is given to the proton production in terms of the maximum energy, emission yield, and angular distribution as a function of the laser energy, focal position, target thickness, and composition. Metallic and polymeric targets allow to generate protons with large energy range and different yield, depending on the laser, target composition, and target geometry properties.
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Affiliation(s)
- L Torrisi
- INFN-LNS Via S. Sofia 44, 95123 Catania, Italy.
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12
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Torrisi L, Cavallaro S, Cutroneo M, Giuffrida L, Krasa J, Margarone D, Velyhan A, Kravarik J, Ullschmied J, Wolowski J, Szydlowski A, Rosinski M. Monoenergetic proton emission from nuclear reaction induced by high intensity laser-generated plasma. Rev Sci Instrum 2012; 83:02B111. [PMID: 22380268 DOI: 10.1063/1.3671741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A 10(16) W∕cm(2) Asterix laser pulse intensity, 1315 nm at the fundamental frequency, 300 ps pulse duration, was employed at PALS laboratory of Prague, to irradiate thick and thin primary CD(2) targets placed inside a high vacuum chamber. The laser irradiation produces non-equilibrium plasma with deutons and carbon ions emission with energy of up to about 4 MeV per charge state, as measured by time-of-flight (TOF) techniques by using ion collectors and silicon carbide detectors. Accelerated deutons may induce high D-D cross section for fusion processes generating 3 MeV protons and 2.5 MeV neutrons, as measured by TOF analyses. In order to increase the mono-energetic proton yield, secondary CD(2) targets can be employed to be irradiated by the plasma-accelerated deutons. Experiments demonstrated that high intensity laser pulses can be employed to promote nuclear reactions from which characteristic ion streams may be developed. Results open new scenario for applications of laser-generated plasma to the fields of ion sources and ion accelerators.
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Affiliation(s)
- L Torrisi
- INFN-LNS Via S. Sofia 44, 95123 Catania, Italy.
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13
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Králík M, Turek K, Vondráček V, Krása J, Velyhan A, Scholz M, Ivanova-Stanik I. Measurement with Bonner spheres spectrometer in pulsed neutron fields. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2010.06.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Králík M, Krása J, Velyhan A, Scholz M, Ivanova-Stanik IM, Bienkowska B, Miklaszewski R, Schmidt H, Řezáč K, Klír D, Kravárik J, Kubeš P. Application of a Bonner sphere spectrometer for determination of the energy spectra of neutrons generated by ≈1 MJ plasma focus. Rev Sci Instrum 2010; 81:113503. [PMID: 21133467 DOI: 10.1063/1.3488372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The spectra of neutrons outside the plasma focus device PF-1000 with an upper energy limit of ≈1 MJ was measured using a Bonner spheres spectrometer in which the active detector of thermal neutrons was replaced by nine thermoluminescent chips. As an a priori spectrum for the unfolding procedure, the spectrum calculated by means of the Monte Carlo method with a simplified model of the discharge chamber was selected. Differences between unfolded and calculated spectra are discussed with respect to properties of the discharge vessel and the laboratory layout.
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Affiliation(s)
- M Králík
- Czech Metrology Institute, 102 00 Prague 10, Czech Republic.
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15
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Margarone D, Krasa J, Laska L, Velyhan A, Mocek T, Prokupek J, Krousky E, Pfeifer M, Gammino S, Torrisi L, Ullschmied J, Rus B. Measurements of the highest acceleration gradient for ions produced with a long laser pulse. Rev Sci Instrum 2010; 81:02A506. [PMID: 20192361 DOI: 10.1063/1.3265315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Ultrafast plasma light ion streams have been produced using the 300 ps, kJ-class iodine laser, operating at PALS Centre in Prague. Ion detection was performed through standard ion collectors (IC) in time-of-flight configuration (TOF), shielded by thin metallic absorbers. This new diagnostics technique has been theoretically studied and experimentally tested in order to cut the long photopeak contribution and to analyze the ultrafast particle signal. Processing the obtained experimental IC-TOF data, including deconvolution processes of the TOF signals, UV/soft-x-ray photopeak absorption, and ion transmission calculations for different metallic filters, is shown. Mainly amorphous carbon (graphite) targets have been irradiated in order to limit the maximum number of ion charge states and to focus our study on demonstrating the validity of the proposed investigation technique. Maximum ion energy and acceleration gradient estimations as a function of the laser energy and focal spot diameter are reported.
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Affiliation(s)
- D Margarone
- Institute of Physics, ASCR, v.v.i., PALS Centre, Prague 18221, Czech Republic.
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16
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Krása J, Velyhan A, Margarone D, Krouský E, Ullschmied J, Skála J, Láska L, Jungwirth K, Rohlena K. Generation of high currents of carbon ions with the use of subnanosecond near-infrared laser pulses. Rev Sci Instrum 2010; 81:02A504. [PMID: 20192359 DOI: 10.1063/1.3265317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Emission of carbon currents reaching values up to 2 A/cm(2) at a distance of 1 m from the laser ion source driven by the subnanosecond Prague Asterix Laser System operated at a fundamental wavelength of 1315 nm is reported. Graphite targets were exposed to intensities up to 5x10(16) W/cm(2) varying both the laser energy and the position of the laser beam focus with respect to the target surface. The maximum energy gain of carbon ions was approximately = 1 MeV/u. At high laser intensities the shape of time-of-flight spectra is also formed by plasma outbursts, whose growth correlates with the oscillatory self-focusing of the laser beam.
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Affiliation(s)
- J Krása
- Institute of Physics, AS CR, v.v.i., 182 21 Prague 8, Czech Republic.
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17
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Láska L, Jungwirth K, Krása J, Krouský E, Rohlena K, Skála J, Velyhan A, Margarone D, Torrisi L, Ryć L, Ullschmied J. Laser generation of Au ions with charge states above 50+. Rev Sci Instrum 2008; 79:02C715. [PMID: 18315268 DOI: 10.1063/1.2821494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Results of recent studies on highly charged Au ion generation, using the intense long pulses of the PALS high power iodine laser (lambda=1.315 microm, E(L)=800 J400 ps), operating under variable experimental conditions (1omega, 3omega, varying target thickness and changing focus positions), are presented. Both the ion collectors and the ion electrostatic analyzers were applied for the identification of ions in a large distance from the target. The time-of-flight collector signals were treated by a means of peak deconvolution assuming a shifted Maxwell-Boltzmann form of the constituent ion current peaks. Attention was paid to the influence of pulse precursor, which becomes evident, especially, if using thinner targets and 1omega. The results for 3omega point to the presence of several groups of ions with the highest recorded charge state Au(53+).
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Affiliation(s)
- L Láska
- Institute of Physics, ASCR 182 21, Prague 8, Czech Republic
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18
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Chalupský J, Juha L, Kuba J, Cihelka J, Hájková V, Koptyaev S, Krása J, Velyhan A, Bergh M, Caleman C, Hajdu J, Bionta RM, Chapman H, Hau-Riege SP, London RA, Jurek M, Krzywinski J, Nietubyc R, Pelka JB, Sobierajski R, Meyer-Ter-Vehn J, Tronnier A, Sokolowski-Tinten K, Stojanovic N, Tiedtke K, Toleikis S, Tschentscher T, Wabnitz H, Zastrau U. Characteristics of focused soft X-ray free-electron laser beam determined by ablation of organic molecular solids. Opt Express 2007; 15:6036-6043. [PMID: 19546907 DOI: 10.1364/oe.15.006036] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A linear accelerator based source of coherent radiation, FLASH (Free-electron LASer in Hamburg) provides ultra-intense femtosecond radiation pulses at wavelengths from the extreme ultraviolet (XUV; lambda<100nm) to the soft X-ray (SXR; lambda<30nm) spectral regions. 25-fs pulses of 32-nm FLASH radiation were used to determine the ablation parameters of PMMA - poly (methyl methacrylate). Under these irradiation conditions the attenuation length and ablation threshold were found to be (56.9+/-7.5) nm and approximately 2 mJ*cm(-2), respectively. For a second wavelength of 21.7 nm, the PMMA ablation was utilized to image the transverse intensity distribution within the focused beam at mum resolution by a method developed here.
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Affiliation(s)
- J Chalupský
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
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