Duty-cycle dependence of the filamentation effect in gas devices for high repetition rate pulsed x-ray FELs

Yiping Feng; Tor O. Raubenheimer

doi:10.1117/12.2261226

20 June 2017 Duty-cycle dependence of the filamentation effect in gas devices for high repetition rate pulsed x-ray FELs

Yiping Feng, Tor O. Raubenheimer

Author Affiliations +

Proceedings Volume 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV; 1023714 (2017) https://doi.org/10.1117/12.2261226
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

Time-dependent simulations were carried out to study the duty-cycle dependence of the density depression effect in gas attenuators and gas intensity monitors servicing a high repetition rate pulsed Free-electron laser beam. The evolution of the temperature/density gradients in-between the pulses in the entire gas volume, especially during the on-cycle, were obtained to evaluate the performance of any given pulse. It was found that the actual achieved attenuation in the attenuator or the intensity measured by the gas monitor deviates from the asymptotic value expected for a uniformly spaced pulse train after reaching a steady state, becoming progressively more significant as the duty-cycle tends lower.

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Yiping Feng and Tor O. Raubenheimer "Duty-cycle dependence of the filamentation effect in gas devices for high repetition rate pulsed x-ray FELs", Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 1023714 (20 June 2017); https://doi.org/10.1117/12.2261226

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