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Title: Measurement of Femtosecond LCLS Bunches Using the SLAC A-Line Spectrometer*

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1260049
Report Number(s):
SLAC-PUB-16646
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Conf.Proc.C110328:2459-2461,2011; Conference: Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr 2011, New York, USA
Country of Publication:
United States
Language:
English
Subject:
Accelerators,ACCPHY

Citation Formats

Huang, Z., Baker, A., Behrens, C., Boyes, M., Craft, J., Decker, F.-J., Ding, Y., Emma, P., Frisch, J., Iverson, R., Lipari, J., Loos, H., Walz, D., and /SLAC. Measurement of Femtosecond LCLS Bunches Using the SLAC A-Line Spectrometer*. United States: N. p., 2016. Web.
Huang, Z., Baker, A., Behrens, C., Boyes, M., Craft, J., Decker, F.-J., Ding, Y., Emma, P., Frisch, J., Iverson, R., Lipari, J., Loos, H., Walz, D., & /SLAC. Measurement of Femtosecond LCLS Bunches Using the SLAC A-Line Spectrometer*. United States.
Huang, Z., Baker, A., Behrens, C., Boyes, M., Craft, J., Decker, F.-J., Ding, Y., Emma, P., Frisch, J., Iverson, R., Lipari, J., Loos, H., Walz, D., and /SLAC. Tue . "Measurement of Femtosecond LCLS Bunches Using the SLAC A-Line Spectrometer*". United States. doi:. https://www.osti.gov/servlets/purl/1260049.
@article{osti_1260049,
title = {Measurement of Femtosecond LCLS Bunches Using the SLAC A-Line Spectrometer*},
author = {Huang, Z. and Baker, A. and Behrens, C. and Boyes, M. and Craft, J. and Decker, F.-J. and Ding, Y. and Emma, P. and Frisch, J. and Iverson, R. and Lipari, J. and Loos, H. and Walz, D. and /SLAC},
abstractNote = {},
doi = {},
journal = {Conf.Proc.C110328:2459-2461,2011},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 28 00:00:00 EDT 2016},
month = {Tue Jun 28 00:00:00 EDT 2016}
}

Conference:
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  • The LCLS photon pulses are expected to attain unprecedented levels of brightness and brevity in the 300--400eV range. Nominally, the photon pulse length will be dominated by the electron bunch length, while the performance of conventional x-ray reflecting and band-shaping optics will be limited by : 1) peak power damage, and 2) transform-limited monochromatization. In this paper we describe how: 1) the correlated energy spread in the electron bunch can be used to selectably compress the LCLS photon pulses to below their nominal length; 2) gas optics can be used to mitigate peak damage problems; 3) the LCLS pulse structuremore » can, in principle, accommodate schemes based on ``disposable`` optics; and 4) pulse lengthening schemes can be used to extend the attainable degree of monochromatization.« less
  • The Linac Coherent Light Source (LCLS) is a SASE 1.5-15 {angstrom} x-ray Free-Electron Laser (FEL) facility. Since an ultra-short intense bunch is used in the LCLS operation one might suggest that wake fields, generated in the vacuum chamber, may have an effect on the x-ray production because these fields can change the beam particle energies thereby increasing the energy spread in a bunch. At LCLS a feedback system precisely controls the bunch energy before it enters a beam transport line after the linac. However, in the transport line and later in the undulator section the bunch energy and energy spreadmore » are not under feedback control and may change due to wake field radiation, which depends upon the bunch current or on a bunch length. The linear part of the energy spread can be compensated in the upstream linac; the energy loss in the undulator section can be compensated by varying the K-parameter of the undulators, however we need a precise knowledge of the wake fields in this part of the machine. Resistive wake fields are known and well calculated. We discuss an additional part of the wake fields, which comes from the different vacuum elements like bellows, BPMs, transitions, vacuum ports, vacuum valves and others. We use the code 'NOVO' together with analytical estimations for the wake potential calculations.« less
  • The LCLS is a novel high-brightness x-ray source designed to operate in the 300--400 eV range. In contrast to conventional synchrotron radiation sources, its output pulses will be characterized by unprecedented levels of brevity and peak power. In this paper we present recently-developed beam line layouts and design features intended to optimize the delivery of the LCLS photons to various experimental stations.
  • At Stanford Linear Accelerator Center (SLAC) a Bunch Length Measurement system has been developed to measure the length of the electron bunch for its new Linac Coherent Light Source (LCLS). This destructive measurement uses a transverse-mounted RF deflector (TCAV) to vertically streak the electron beam and an image taken with an insertable screen and a camera. The device control software was implemented with the Experimental Physics and Industrial Control System (EPICS) toolkit. The analysis software was implemented in Matlab{trademark} using the EPICS/Channel Access Interface for Scilab{trademark} and Matlab{trademark} (labCA). This architecture allowed engineers and physicists to develop and integrate theirmore » control and analysis without duplication of effort.« less