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B. Yang

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2 papers

title: Investigations of electron-beam microbunching and beam coalignment using CTR in a high-gain SASE FEL

format: conference procceeding

conference: 2001 Particle Accelerator Conference

year: 2001

11 authors: A. Lumpkin | W. Berg | S. Biedron | M. Borland | Y. C. Chae | R. Dejus | J. Lewellen | S. Milton | E. Moog | G. Travish | B. Yang

abstract: We recently extended our experiments on z-dependent electron-beam microbunching using coherent transition radiation (CTR) into the high-gain, self-amplified spontaneous emission free-electron laser (FEL) regime. The UV-visible FEL at the Advanced Photon Source was operated at 530 nm and 385 nm using the bunch-compressed photocathode gun electron beam, linac, and 21.6 m of undulator length. The longitudinal microbunching of the electron beam was tracked by inserting a metal foil and a mirror after each of the nine 2.4-m-long undulators. The visible CTR generated by the electron-beam interaction was imaged and analyzed for z-dependent intensity, angular distribution, and spot size. Additionally, the image centroids and structures were used in evaluating the critical electron beam/photon beam overlap issue as a complement to the trajectory data from the beam position monitors. (9 References).

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title: The FEL development at the Advanced Photon Source

format: conference procceeding

conference: Free-Electron Laser Challenges II

year: 1999

46 authors: S. V. Milton | N. D. Arnold | C. Benson | S. Berg | W. Berg | S. G. Biedron | Y. C. Chae | E. A. Crosbie | G. Decker | B. Deriy | R. J. Dejus | P. D. Hartog | R. Dortwegt | M. Erdmann | Z. Huang | H. Friedsam | H. P. Freund | J. N. Galayda | E. Gluskin | G. A. Goeppner | A. Grelick | J. Jones | Y. Kang | K. J. Kim | S. Kim | K. Kinoshita | R. Lill | J. W. Lewellen | A. H. Lumpkin | G. M. Markovich | O. Makarov | E. R. Moog | A. Nassiri | V. Ogurtsov | S. Pasky | J. Power | B. Tieman | E. Trakhtenberg | G. Travish | I. Vasserman | N. Vinokurov | D. R. Walters | J. Wang | X. J. Wang | B. Yang | S. Xu

abstract: Construction of a single-pass free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) mode of operation is nearing completion at the Advanced Photon Source (APS) with initial experiments imminent. The APS SASE FEL is a proof-of-principle fourth-generation light source. As of January 1999 the undulator hall, end-station building, necessary transfer lines, electron and optical diagnostics, injectors, and initial undulators have been constructed and, with the exception of the undulators, installed. All preliminary code development and simulations have also been completed. The undulator hall is now ready to accept first beam for characterization of the output radiation. It is the project goal to push towards full FEL saturation, initially in the visible, but ultimately to UV and VUV, wavelengths. (10 References).

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title:	Investigations of electron-beam microbunching and beam coalignment using CTR in a high-gain SASE FEL
format:	conference procceeding
conference:	2001 Particle Accelerator Conference
year:	2001
11 authors:	A. Lumpkin \| W. Berg \| S. Biedron \| M. Borland \| Y. C. Chae \| R. Dejus \| J. Lewellen \| S. Milton \| E. Moog \| G. Travish \| B. Yang
abstract:	We recently extended our experiments on z-dependent electron-beam microbunching using coherent transition radiation (CTR) into the high-gain, self-amplified spontaneous emission free-electron laser (FEL) regime. The UV-visible FEL at the Advanced Photon Source was operated at 530 nm and 385 nm using the bunch-compressed photocathode gun electron beam, linac, and 21.6 m of undulator length. The longitudinal microbunching of the electron beam was tracked by inserting a metal foil and a mirror after each of the nine 2.4-m-long undulators. The visible CTR generated by the electron-beam interaction was imaged and analyzed for z-dependent intensity, angular distribution, and spot size. Additionally, the image centroids and structures were used in evaluating the critical electron beam/photon beam overlap issue as a complement to the trajectory data from the beam position monitors. (9 References).
keywords:
Download \| View \| Details

title:	The FEL development at the Advanced Photon Source
format:	conference procceeding
conference:	Free-Electron Laser Challenges II
year:	1999
46 authors:	S. V. Milton \| N. D. Arnold \| C. Benson \| S. Berg \| W. Berg \| S. G. Biedron \| Y. C. Chae \| E. A. Crosbie \| G. Decker \| B. Deriy \| R. J. Dejus \| P. D. Hartog \| R. Dortwegt \| M. Erdmann \| Z. Huang \| H. Friedsam \| H. P. Freund \| J. N. Galayda \| E. Gluskin \| G. A. Goeppner \| A. Grelick \| J. Jones \| Y. Kang \| K. J. Kim \| S. Kim \| K. Kinoshita \| R. Lill \| J. W. Lewellen \| A. H. Lumpkin \| G. M. Markovich \| O. Makarov \| E. R. Moog \| A. Nassiri \| V. Ogurtsov \| S. Pasky \| J. Power \| B. Tieman \| E. Trakhtenberg \| G. Travish \| I. Vasserman \| N. Vinokurov \| D. R. Walters \| J. Wang \| X. J. Wang \| B. Yang \| S. Xu
abstract:	Construction of a single-pass free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) mode of operation is nearing completion at the Advanced Photon Source (APS) with initial experiments imminent. The APS SASE FEL is a proof-of-principle fourth-generation light source. As of January 1999 the undulator hall, end-station building, necessary transfer lines, electron and optical diagnostics, injectors, and initial undulators have been constructed and, with the exception of the undulators, installed. All preliminary code development and simulations have also been completed. The undulator hall is now ready to accept first beam for characterization of the output radiation. It is the project goal to push towards full FEL saturation, initially in the visible, but ultimately to UV and VUV, wavelengths. (10 References).
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