| Autor: |
J. Cikhardt, M. Gyrdymov, S. Zähter, P. Tavana, M. M. Günther, N. Bukharskii, N. Borisenko, J. Jacoby, X. F. Shen, A. Pukhov, N. E. Andreev, O. N. Rosmej |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Matter and Radiation at Extremes, Vol 9, Iss 2, Pp 027201-027201-10 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2468-080X |
| DOI: |
10.1063/5.0181119 |
| Popis: |
Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. Synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativistic laser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In an experiment at the PHELIX laser system, high-current directed beams of DLA electrons with a mean energy ten times higher than the ponderomotive potential and maximum energy up to 100 MeV were measured at 1019 W/cm2 laser intensity. The spectrum of directed x-rays in the range of 5–60 keV was evaluated using two sets of Ross filters placed at 0° and 10° to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 1013 photons/sr with energies >5 keV measured at 0° to the laser axis and a brilliance of 1021 photons s−1 mm−2 mrad−2 (0.1%BW)−1. The angular distribution of the emission has an FWHM of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short emission time, DLA-based keV backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laser facilities. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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