Start-to-end jitter simulations of the linac coherent light source

Borland, M.; Chae, Y.C.; Milton, Stephen; Soliday, R.; Bharadwaj, V.; Emma, P.; Krejcik, P.; Limborg, C.; Nuhn, H.‐D.; Woodley, M.

doi:10.1109/pac.2001.987880

Cited by 13 publications

(17 citation statements)

References 7 publications

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“…The energy spectrum displays fragmentation features that, while certainly the result of CSR, appear to not be indicative of the microbunching instability [4,5]. It is seen from simulation that the observed effects depend strongly on the CSR wake present in the drift and copropagating with the beam downstream of the bunch compression regions.…”

Section: Introductionmentioning

confidence: 96%

Measurement and simulation of the impact of coherent synchrotron radiation on the Jefferson Laboratory energy recovery linac electron beam

Hall

Biedron

Edelen

et al. 2015

Phys. Rev. ST Accel. Beams

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In an experiment conducted on the Jefferson Laboratory IR free-electron laser driver, the effects of coherent synchrotron radiation (CSR) on beam quality were studied. The primary goal of this work was to explore CSR output and effect on the beam with variation of the bunch compression in the IR recirculator. Here we examine the impact of CSR on the average energy loss as a function of bunch compression as well as the impact of CSR on the energy spectrum of the bunch. Simulation of beam dynamics in the machine, including the one-dimensional CSR model, shows very good agreement with the measured effect of CSR on the average energy loss as a function of compression. Finally, a well-defined structure is observed in the energy spectrum with a feature in the spectrum that varies as a function of the compression. This effect is examined in simulations, as well, and a simple explanation for the variation is proposed.

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Section: Introductionmentioning

confidence: 96%

Measurement and simulation of the impact of coherent synchrotron radiation on the Jefferson Laboratory energy recovery linac electron beam

Hall

Biedron

Edelen

et al. 2015

Phys. Rev. ST Accel. Beams

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“…Its use of the Self-Describing Data Sets (SDDS) file protocol [9] allows highly automated preparation and post-processing of input and output. Use of the SDDS file protocol has also enabled start-to-end simulation of FELs and their linac drivers [10].…”

Section: Simulation Methodsmentioning

confidence: 99%

Initial characterization of coherent synchrotron radiation effects in the APS bunch compressor

Borland

Lewellen²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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A chicane bunch compressor was recently installed in the Advanced Photon Source (APS) linac in support of the Low-Energy Undulator Test Line (LEUTL) free-electron laser (FEL) project. As in any magnetic compression system, the use of bending magnets raises concerns about corruption of the emittance by coherent synchrotron radiation (CSR). In this paper, we present results of an initial characterization of these effects in the APS system. We also compare the measurements to simulations with the program elegant. The horizontally bending compressor is equipped with numerous diagnostics to aid in the exploration and reduction of CSR effects. These include: a flag in the chicane center for imaging the energy distribution; a flag for critical beam size tuning at the exit of the final chicane dipole; a vertical-bending spectrometer line downstream of the chicane with two flags for imaging CSR-induced correlations between horizontal and energy coordinates; and a three-flag emittance measurement system downstream of the chicane.

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“…Some of the results for 17-seconds of simulated LCLS operation are shown in Figure 6 (tracking 10 5 particles 2000 times with random parameter jitter). Further studies which include all six dimensions of phase space are described in reference [21]. The variation in bunch arrival time is of the order of the bunch length itself (i.e., ~100 fsec rms).…”

Section: Machine Stabilitymentioning

confidence: 99%

Issues and R&D critical to the LCLS

Emma

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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*The Linac Coherent Light Source (LCLS) [1] is a high brightness x-ray free-electron laser project based on the SLAC linac. A new photocathode rf gun serves as injector for the last kilometer of the linac, which is fitted with two-stages of bunch compression. Acceleration to 15-GeV produces intense 1.5-Å coherent radiation by selfamplified spontaneous emission in a long undulator. A multi-laboratory project collaboration is addressing the most challenging issues [2], including: 1) feasibility of a stable injector with normalized emittance of 1 µm at 1 nC; 2) emittance control in the linac including effects of coherent synchrotron radiation in the bunch compressors; 3) stability of the final electron beam in the presence of charge, timing, and energy variations; 4) design, construction and alignment of a long planar undulator with 3-cm period and discrete periodic focusing lattice; 5) understanding and control of wakefields due to wall surface roughness in the undulator vacuum chamber; 6) radiation-matter interactions in the strong field regime with mirror and crystal optics for filtering and deflecting. These issues, and a project update, are presented.

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Start-to-end jitter simulations of the linac coherent light source

Cited by 13 publications

References 7 publications

Measurement and simulation of the impact of coherent synchrotron radiation on the Jefferson Laboratory energy recovery linac electron beam

Measurement and simulation of the impact of coherent synchrotron radiation on the Jefferson Laboratory energy recovery linac electron beam

Initial characterization of coherent synchrotron radiation effects in the APS bunch compressor

Issues and R&D critical to the LCLS

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