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

Borland, M.; Lewellen, J. W.

doi:10.1109/pac.2001.987928

Cited by 13 publications

(13 citation statements)

References 5 publications

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“…We note that the CSR model [7] [8] used by elegant may not be fully applicable to the LCLS parameters. Although there is experimental evidence that this model works [9] [10], the LCLS is in a different regime than these experiments. In particular, downstream of the second bunch compressor, where most of the CSR-induced emittance growth occurs, the bunch length is very short (22 µm) compared to the transverse beam size (∼ 1 mm).…”

Section: Simulation Resultsmentioning

confidence: 85%

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

Borland

Chae²,

Milton³

et al.

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

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The Linac Coherent Light Source (LCLS) is a fourthgeneration light source demonstration project based on the self-amplified spontaneous emission (SASE) free-electron laser (FEL) concept. It will combine a new photoinjector, the Stanford Linear Accelerator Center (SLAC) linac, with two stages of bunch compression and a long undulator to create intense radiation pulses at 1.5 A. Successful operation of the LCLS will require consistent delivery of a highbrightness electron beam to the undulator, in the face of effects such as wakefields and coherent synchrotron radiation (CSR). Because of the sensitivity to beam quality and subtle effects, it is necessary to perform integrated tracking from the cathode through the undulator. We report on the combined use of PARMELA, elegant, and GENESIS to perform these simulations, and in particular the simulation of pulse-to-pulse variation in FEL performance due to rfand laser-related variation in the electron beam.

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Section: Simulation Resultsmentioning

confidence: 85%

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

Borland

Chae²,

Milton³

et al.

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

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“…It is apparent that the camera assembly has achieved its original design goal. The cameras have been used for studies of the low-emittance beam [5]. While the initial results are encouraging, further characterization with electron beam is needed to better understand the effect of the converter screen, the interplay between the screen efficiency (counting statistics) and saturation, and to separate the linac's jitter from the statistical fluctuation.…”

Section: Calibration and Measurementmentioning

confidence: 99%

“…While the initial results are encouraging, further characterization with electron beam is needed to better understand the effect of the converter screen, the interplay between the screen efficiency (counting statistics) and saturation, and to separate the linac's jitter from the statistical fluctuation. † It requires collection of >10 nC beam charge [5]. The actual beta function used was 0.6 m, reducing the beam size to 39 µm for beam with 1 π mm⋅mrad emittance.…”

Section: Calibration and Measurementmentioning

confidence: 99%

Design and performance of a compact imaging system for the APS linac bunch compressor

Yang

Rotela

Arnold

et al.

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

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We present the design and performance of a highresolution, high charge sensitivity imaging camera system for the APS linac beam profile measurement. Electron beam distribution is converted to light intensity distribution using standard YAG or optical transition radiation (OTR) screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. One camera is normally set to a low magnification to give a full view of the converter screen (20 mm × 15 mm), and the other is set to a high magnification for measuring small beam. The overall dimension of the camera system is 400 mm × 165 mm × 110 mm. The focus and irises are driven by stepper motors and are remotely controlled. The fixed magnification and remotely controlled focus enable high reproducibility during beam-based setup of the optics. On bench test, the camera gave better then 10-µm resolution and better that 1% reproducibility of the magnification.

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“…A few experiments have been carried out, with encouraging results (e.g., [14]), but more data and experience is still needed, especially in the LCLS regime. R&D on this critical issue is being carried out, in part, at ANL/APS at the LEUTL facility [15], and possibly at SLAC in the near future [16].…”

Section: Brightness Preservationmentioning

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

Cited by 13 publications

References 5 publications

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

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

Design and performance of a compact imaging system for the APS linac bunch compressor

Issues and R&D critical to the LCLS

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