Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam
Abstract
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.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1414048
- Alternate Identifier(s):
- OSTI ID: 1417647; OSTI ID: 1466810
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Published Article
- Journal Name:
- Journal of Synchrotron Radiation (Online)
- Additional Journal Information:
- Journal Name: Journal of Synchrotron Radiation (Online) Journal Volume: 25 Journal Issue: 1; Journal ID: ISSN 1600-5775
- Publisher:
- International Union of Crystallography (IUCr)
- Country of Publication:
- Denmark
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; gas; density depression; X-ray; FEL; attenuation; pump–probe
Citation Formats
Feng, Y., Schafer, D. W., Song, S., Sun, Y., Zhu, D., Krzywinski, J., Robert, A., Wu, J., and Decker, F. -J. Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam. Denmark: N. p., 2018.
Web. doi:10.1107/S1600577517014278.
Feng, Y., Schafer, D. W., Song, S., Sun, Y., Zhu, D., Krzywinski, J., Robert, A., Wu, J., & Decker, F. -J. Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam. Denmark. https://doi.org/10.1107/S1600577517014278
Feng, Y., Schafer, D. W., Song, S., Sun, Y., Zhu, D., Krzywinski, J., Robert, A., Wu, J., and Decker, F. -J. Mon .
"Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam". Denmark. https://doi.org/10.1107/S1600577517014278.
@article{osti_1414048,
title = {Direct experimental observation of the gas density depression effect using a two-bunch X-ray FEL beam},
author = {Feng, Y. and Schafer, D. W. and Song, S. and Sun, Y. and Zhu, D. and Krzywinski, J. and Robert, A. and Wu, J. and Decker, F. -J.},
abstractNote = {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.},
doi = {10.1107/S1600577517014278},
journal = {Journal of Synchrotron Radiation (Online)},
number = 1,
volume = 25,
place = {Denmark},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}
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https://doi.org/10.1107/S1600577517014278
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