A Transmissive Optics Approach for Time-Slicing the LCLS X-Ray Pulse

Bionta, R.M.

Lawrence Livermore National Laboratory

关键词: 71 Classical And Quantum Mechanics, General Physics;    Optical Systems;    Electric Fields;    72 Physics Of Elementary Particles And Fields;    Plates;   

DOI  :  10.2172/793866
RP-ID  :  UCRL-ID-139011
RP-ID  :  W-7405-Eng-48
RP-ID  :  793866

美国|英语

来源: UNT Digital Library

【 摘 要 】

This paper investigates the use of off-axis zone plate optical systems to deliver time-sliced LCLS FEL pulses to users under the 3 energy chirp scenarios elucidated by P. Emma. We present formulas for designing off-axis zone plate optical systems that achieve a given time-slice duration and intensity. The results show that it is feasible to fabricate zone-plate systems capable of providing intense spots of time-sliced 8.275 KeV photons under the scenario of a 2.0% chirp, but that it is beyond current and envisioned fabrication capabilities to create zone-plate systems of similar performance under the scenarios offering energy chirps of < 0.25%. Finally we present results of numerical calculations of the electric fields delivered to the user by an off-axis zone plate optical system producing time-slices of {le} 50 {center_dot} fs with photon densities of 200 photons/{angstrom}{sup 2} under the 2% energy chirp scenario.