skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: FEL Beam Stability in the LCLS

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; « less
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. Mon . "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 = {Mon Jul 18 00:00:00 EDT 2016},
month = {Mon Jul 18 00:00:00 EDT 2016}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • To maintain gain in the 100 m long linac-driven Linac Coherent Light Source (LCLS) FEL undulator, the electron and photon beams must propagate colinearly to within -5 {micro}m rms over distances comparable to the 11.7 m FEL gain length in the 6 mm diameter undulator vacuum chamber. The authors have considered a variety of intercepting and non-intercepting position monitor technologies to establish and maintain this beam alignment. They present a summary discussion of the applicability and estimated performance of monitors detecting synchrotron radiation, transition and diffraction radiation, fluorescence, photoemission or bremsstrahlung from thin wires, Compton scattering from laser beams, andmore » image currents from the electron beam. They conclude that: (1) non-intercepting RF cavity electron BPMs, together with a beam based alignment system, the best suited for this application; and (2) insertable intercepting wire monitors are valuable for rough alignment, for beam size measurements, and for simultaneous measurement of electron and photon beam position by detecting bremsstrahlung from electrons and diffracted x-rays from the photo beam.« less
  • The 4 GeV LCLS-II superconducting linac with high repetition beam rate enables the possibility to drive an X-Ray FEL oscillator at harmonic frequencies *. Compared to the regular LCLS-II machine setup, the oscillator mode requires a much longer bunch length with a relatively lower current. Also a flat longitudinal phase space distribution is critical to maintain the FEL gain since the X-ray cavity has extremely narrow bandwidth. In this paper, we study the longitudinal phase space optimization including shaping the initial beam from the injector and optimizing the bunch compressor and dechirper parameters. We obtain a bunch with a flatmore » energy chirp over 400 fs in the core part with current above 100 A. The optimization was based on LiTrack and Elegant simulations using LCLS-II beam parameters.« less
  • We have examined the influence of misalignments and magnet errors on the predicted performance of the Linac Coherent Light Source (LCLS). Due to the extremely large number of wiggler periods (> 10{sup 3}) and the small optical mode size (20 {mu}m), alignment and magnet tolerances will be quite demanding. These demands may increase if the wiggler is split into separate sections by the possible inclusion of diagnostic stations, dispersive sections, etc. We have attempted to quantify such tolerances using the numerical simulation code FRED-3D.