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Title: PERTURBATION ANALYSIS FOR BEAM TRAJECTORIES. DETERMINING LOCAL SHIELDING CONTAINMENT FOR LCLS-II

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1358676
Report Number(s):
SLAC-PUB-16982
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 8th International Particle Accelerator Conference, 14-19 May 2017. Copenhagen, Denmark
Country of Publication:
United States
Language:
English
Subject:
INST, PHYS, XFEL, OTHER

Citation Formats

Santana Leitner, Mario. PERTURBATION ANALYSIS FOR BEAM TRAJECTORIES. DETERMINING LOCAL SHIELDING CONTAINMENT FOR LCLS-II. United States: N. p., 2017. Web.
Santana Leitner, Mario. PERTURBATION ANALYSIS FOR BEAM TRAJECTORIES. DETERMINING LOCAL SHIELDING CONTAINMENT FOR LCLS-II. United States.
Santana Leitner, Mario. Thu . "PERTURBATION ANALYSIS FOR BEAM TRAJECTORIES. DETERMINING LOCAL SHIELDING CONTAINMENT FOR LCLS-II". United States. doi:. https://www.osti.gov/servlets/purl/1358676.
@article{osti_1358676,
title = {PERTURBATION ANALYSIS FOR BEAM TRAJECTORIES. DETERMINING LOCAL SHIELDING CONTAINMENT FOR LCLS-II},
author = {Santana Leitner, Mario},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}

Conference:
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  • Shielding of specific electronic components from the harsh bremsstrahlung environment expected on PBFA II has been investigated. 3-D Monte Carlo estimates of dose in locations throughout the facility have been compared with electronic technology thresholds to identify possible problem locations or technologies. In some parts of the facility, implementation of the 30-MV lithium ion diode option will increase dose rates to electronic equipment above tolerable levels. As a result, additional close-in shielding is being employed and some components are being moved to lower radiation level locations. None of the changes are prohibitive in terms of time, cost, or accelerator utility.
  • 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
  • The SLAC National Accelerator Laboratory is building a new FEL user facility, LCLS-II, as a major upgrade to the Linear Coherent Light Source (LCLS). The upgrade will include two new Free Electron Lasers (FELs), to generate soft (SXR) and hard x-ray (HXR) SASE FEL radiation, based on planar, variable gap hybrid undulators with two different undulator periods (SXU: 55 mm, HXU: 32 mm). An algebraic FEL tolerance analysis for the undulator lines, including tuning, alignment, and phase correction tolerances has been performed. The methods and results are presented in this paper.