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Laser Power Density Dependence on Charge State Distribution of Ta Ion Laser Plasma
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SYSNO ASEP 0524538 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Laser Power Density Dependence on Charge State Distribution of Ta Ion Laser Plasma Author(s) Okamura, M. (JP)
Tamis, A. (US)
Whelan, T. (US)
Kanesue, T. (US)
Ikeda, S. (US)
Cannavó, Antonino (UJF-V) ORCID, SAINumber of authors 6 Article number 013325 Source Title Review of Scientific Instruments. - : AIP Publishing - ISSN 0034-6748
Roč. 91, č. 1 (2020)Number of pages 4 s. Publication form Print - P Language eng - English Country US - United States Keywords laser ablation ; laser produced plasma ; accelerator applications Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders OECD category Nuclear physics Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000602546800001 EID SCOPUS 85078527319 DOI 10.1063/1.5129530 Annotation Laser power density per pulse, which is commonly expressed with the unit of 'W/cm2,' is an important parameter to characterize ablation plasma. To match a design charge state of heavy ion beam induced by a laser ion source, a laser power density must be carefully chosen. Above around 108 W/cm2 of laser power density, laser ablation plasma is emitted from the surface of solid material. Then, up to 109 W/cm2, the most abundant charge state is 1+. Because the ionization energy increases with higher charge states, increasing the laser intensity leads to the charge state distribution shifting higher. Increasing the density to increase charge states also results in lower time of flight due to higher velocities. The maximum laser power density is obtained by the smallest available laser spot size on the target material which is determined by the quality of the laser beam. For many accelerator applications, higher charge state beams are preferred. In particular cases, singly charge ion beams are demanded. Therefore, production of intermediate charge state beams has not been investigated well. In this study, we selected Ta4+ as an example demanded beam and tried to clarify how the transition of charge state distribution depends on laser power density. Conclusively, the possible specification of a laser ion source for Ta4+ delivery was elucidated. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2021 Electronic address https://doi.org/10.1063/1.5129530
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