期刊
APPLIED PHYSICS LETTERS
卷 113, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5046070
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资金
- German Federal Ministry of Education and Research BMBF [05K16ME1]
- Czech Ministry of Education [LG15013, LM2015083]
- EPSRC [EP/K503733/1]
Recent studies confirmed that the materials used in the extreme UV and soft X-ray regime for precise characterization of intense free-electron laser pulses (e.g., Si3N4) do not work efficiently in the hard X-ray regime, which is due to the fact that the impact of a hard X-ray photon is followed by a series of electron cascading processes. Following theoretical indication, we show that this limitation can be circumvented and the cascading time can be significantly reduced if the X-ray photon energy is double the ionization energy. We investigate an alternative material for pulse diagnostics, SnO2, using the Linac Coherent Light Source at photon energies of 5 keV and 9 keV. We prove the validity of the concept and show that it has a large potential for practical applications. By applying the proposed criteria, the temporal accuracy of the non-invasive pulse diagnostic tools can be improved in current and emerging hard X-ray facilities. Published by AIP Publishing.
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