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Title: FEL Beam Stability in the LCLS

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1270626
Report Number(s):
SLAC-PUB-16660
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Conf.Proc.C110328:2423-2425,2011; 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

Turner, J.L., Akre, R., Brachmann, A., Decker, F.-J., Ding, Y.T., Emma, P., Feng, Y., Fisher, A., Frisch, J., Gilevich, A., Hering, P., Horovitz, K., Huang, Z., Iverson, R., Kharakh, D., Krasnykh, A., Krzywinski, J., Loos, H., Messerschmidt, M., Moeller, S., Nuhn, H.-D., and /SLAC. FEL Beam Stability in the LCLS. United States: N. p., 2016. Web.
Turner, J.L., Akre, R., Brachmann, A., Decker, F.-J., Ding, Y.T., Emma, P., Feng, Y., Fisher, A., Frisch, J., Gilevich, A., Hering, P., Horovitz, K., Huang, Z., Iverson, R., Kharakh, D., Krasnykh, A., Krzywinski, J., Loos, H., Messerschmidt, M., Moeller, S., Nuhn, H.-D., & /SLAC. FEL Beam Stability in the LCLS. United States.
Turner, J.L., Akre, R., Brachmann, A., Decker, F.-J., Ding, Y.T., Emma, P., Feng, Y., Fisher, A., Frisch, J., Gilevich, A., Hering, P., Horovitz, K., Huang, Z., Iverson, R., Kharakh, D., Krasnykh, A., Krzywinski, J., Loos, H., Messerschmidt, M., Moeller, S., Nuhn, H.-D., and /SLAC. 2016. "FEL Beam Stability in the LCLS". United States. doi:. https://www.osti.gov/servlets/purl/1270626.
@article{osti_1270626,
title = {FEL Beam Stability in the LCLS},
author = {Turner, J.L. and Akre, R. and Brachmann, A. and Decker, F.-J. and Ding, Y.T. and Emma, P. and Feng, Y. and Fisher, A. and Frisch, J. and Gilevich, A. and Hering, P. and Horovitz, K. and Huang, Z. and Iverson, R. and Kharakh, D. and Krasnykh, A. and Krzywinski, J. and Loos, H. and Messerschmidt, M. and Moeller, S. and Nuhn, H.-D. and /SLAC},
abstractNote = {},
doi = {},
journal = {Conf.Proc.C110328:2423-2425,2011},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

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  • No abstract prepared.
  • 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.
  • To maintain stable performance of the Linac Coherent Light Source (LCLS) x-ray free-electron laser, one must control the electron trajectory stability through the undulator to a small fraction of the beam size. BPM-based feedback loops running at 120 Hz will be effective in controlling jitter at low frequencies less than a few Hz. On the other hand, linac and injector stability tolerances must be chosen to limit jitter at higher frequencies. In this paper we study possible sources of high frequency jitter, including: (1) steering coil current regulation; (2) quadrupole magnet transverse vibrations; (3) quadrupole current regulation with transverse misalignments;more » (4) charge variations coupled to jitter through transverse wakefields of misaligned RF structures; and (5) bunch length variations coupled through coherent synchrotron radiation in the bunch compressor chicanes. Based on this study, we set component tolerances and estimate expected trajectory stability in the LCLS.« less
  • X-ray FELs demand that the positions of undulator components be stable to less than 1 {mu}m per day. Simultaneously, the undulator length increases significantly in order to saturate at x-ray wavelengths. To minimize the impact of the outside environment, the Linac Coherent Light Source (LCLS) undulator is placed underground, but reliable data about ground motion inside such a tunnel was not available in the required stability range during the planning phase. Therefore, a new position monitor system had been developed and installed with the LCLS undulator. This system is capable of measuring x, y, roll, pitch and yaw of eachmore » of the 33 undulator quadrupoles with respect to stretched wires. Instrument resolution is about 10 nm and instrument drift is negligible. Position data of individual quadrupoles can be correlated along the entire 132-m long undulator. The system has been under continuous operation since 2009. This report describes long term experiences with the running system and the observed positional stability of the undulator quadrupoles.« less