NDLI: Parameter Optimizations and Performances for the Low-Charge Beams in PAL Free-Electron Laser

Content Provider	IEEE Xplore Digital Library
Author	Eun-San Kim Ji-Gwang Hwang Moohyun Yoon
Copyright Year	1963
Abstract	We investigated optimum choices of beam and accelerator parameters for low-charge beams of self-amplified spontaneous emission (SASE) free-electron laser (FEL) at PAL. The FEL system is designed to provide a short pulse beam to generate the high power of the wavelength of 1-Å in the undulator. The designed linac provides the pulses of 10 fs rms and 3.85 fs rms for the charges of 0.2 nC and 0.02 nC, respectively. Parameters of the two-stage bunch compressors are optimized to reduce the effects of coherent synchrotron radiation. The bunch compressors are also designed such that the effects of nonlinearities due to wakefields, rf curvature, and second-order momentum compaction become as small as possible in the linear accelerator. Through these parameter optimizations, we have minimized the bunch charges that could decrease effects of emittance dilution and growth of energy spread, which may deteriorate the SASE performance. Start-to-end tracking simulations include the longitudinal and transverse wakefields, and the effects of errors such as rf gun timing, rf phase, and rf voltage are investigated. We investigated the effectiveness of a laser heater that may give Landau damping to suppress the microbunching beam instability. It is shown that a laser heater may suppress the microbunching beam instability in the FEL system. We also investigated the effects of the ac and dc resistive wall wakefields in a long undulator. It is shown that energy variations induced within the bunch over the length of the undulator are acceptable. As a result, through these optimizations studies, we could get beam parameters and accelerator parameters that can provide the FEL power of the 60 GW with FEL pulse of 10 fs and 3 fs in the wavelength of 1-Å in around a 50-m-long undulator for the charges of 0.2 nC and 0.02 nC, respectively. It is shown by our optimizations that our designed FEL system shows required performances for the low-charge beams in the 10 GeV.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	2000
Ending Page	2010
Page Count	11
File Size	1310328
File Format	PDF
ISSN	00189499
Volume Number	58
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser beams Undulators Linear particle accelerator Particle beams Compressors Optimization Free electron lasers wakefield Bunch compressor coherent synchrotron radiation free electron laser undulator
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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