Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam

被引：1

作者：

Feng, Y. ^{[1
]}

Schafer, D. W. ^{[1
]}

Song, S. ^{[1
]}

Sun, Y. ^{[1
]}

Zhu, D. ^{[1
]}

Krzywinski, J. ^{[1
]}

Robert, A. ^{[1
]}

Wu, J. ^{[1
]}

Decker, F. -J. ^{[1
]}

机构：

[1] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2018年 / 25卷

关键词：

gas; density depression; X-ray; FEL; attenuation; pump-probe; FREE-ELECTRON LASER; EXTREME-ULTRAVIOLET; COHERENT; ATTENUATOR; INSTRUMENT; RADIATION; OPERATION; DYNAMICS; PULSES;

D O I：

10.1107/S1600577517014278

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The experimental observation of the depression effect in gas devices designed for X-ray free-electron lasers (FELs) is reported. The measurements were carried out at the Linac Coherent Light Source using a two-bunch FEL beam at 6.5 keV with 122.5 ns separation passing through an argon gas cell. The relative intensities of the two pulses of the two-bunch beam were measured, after and before the gas cell, from X-ray scattering off thin targets by using fast diodes with sufficient temporal resolution. At a cell pressure of 140 hPa, it was found that the after-to-before ratio of the intensities of the second pulse was about 17% +/- 6% higher than that of the first pulse, revealing lower effective attenuation of the gas cell due to heating by the first pulse and subsequent gas density reduction in the beam path. This measurement is important in guiding the design and/or mitigating the adverse effects in gas devices for high-repetition- rate FELs such as the LCLS-II and the European XFEL or other future high-repetition-rate upgrades to existing FEL facilities.

引用

页码：145 / 150

页数：6

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