Filamentation effect in a gas attenuator for high-repetition-rate X-ray FELs

被引：7

作者：

Feng, Yiping ^{[1
]}

Krzywinski, Jacek ^{[1
]}

Schafer, Donald W. ^{[1
]}

Ortiz, Eliazar ^{[1
]}

Rowen, Michael ^{[1
]}

Raubenheimer, Tor O. ^{[1
]}

机构：

[1] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2016年 / 23卷

关键词：

filamentation; X-ray; FEL; attenuation; gas; photoabsorption; diffusion; FREE-ELECTRON LASER; EXTREME-ULTRAVIOLET; OPERATION;

D O I：

10.1107/S1600577515018408

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A sustained filamentation or density depression phenomenon in an argon gas attenuator servicing a high-repetition femtosecond X-ray free-electron laser has been studied using a finite-difference method applied to the thermal diffusion equation for an ideal gas. A steady-state solution was obtained by assuming continuous-wave input of an equivalent time-averaged beam power and that the pressure of the entire gas volume has reached equilibrium. Both radial and axial temperature/density gradients were found and describable as filamentation or density depression previously reported for a femtosecond optical laser of similar attributes. The effect exhibits complex dependence on the input power, the desired attenuation, and the geometries of the beam and the attenuator. Time-dependent simulations were carried out to further elucidate the evolution of the temperature/density gradients in between pulses, from which the actual attenuation received by any given pulse can be properly calculated.

引用

页码：21 / 28

页数：8

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