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

Feng, Y.; Schafer, D. W.; Song, S.; Sun, Y.; Zhu, D.; Krzywinski, J.; Robert, A.; Wu, J.; Decker, F. -J.

doi:10.1107/S1600577517014278

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

Journal Article · Mon Jan 01 00:00:00 EST 2018 · Journal of Synchrotron Radiation (Online)

DOI:https://doi.org/10.1107/S1600577517014278· OSTI ID:1414048

Feng, Y.; Schafer, D. W.;

;

; Zhu, D.; Krzywinski, J.;

;

; Decker, F. -J.

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1414048

Alternate ID(s):: OSTI ID: 1417647; OSTI ID: 1466810

Journal Information:: Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Vol. 25 Journal Issue: 1; ISSN 1600-5775

Publisher:: International Union of Crystallography (IUCr)Copyright Statement

Country of Publication:: Denmark

Language:: English

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Cited by: 1 work

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43 PARTICLE ACCELERATORS
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attenuation
pump–probe

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