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W. Berg

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Last Name: Berg

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8 papers
title: Self-amplified spontaneous emission saturation at the Advanced Photon Source free-electron laser
format: journal article
publisher: Review of Scientific Instruments
year: 2002
29 authors: E. R. Moog | S. V. Milton | N. D. Arnold | C. Benson | W. Berg | S. G. Biedron | M. Borland | Y. C. Chae | R. J. Dejus | P. K. Den Hartog | B. Deriy | M. Erdmann | E. Gluskin | Z. Huang | K. J. Kim | J. W. Lewellen | Y. Li | A. H. Lumpkin | O. Makarov | A. Nassiri | V. Sajaev | R. Soliday | B. J. Tieman | E. M. Trakhtenberg | G. Travish | I. B. Vasserman | N. A. Vinokurov | G. Wiemerslage | B. X. Yang
abstract: Today, many bright photon beams in the ultraviolet and x-ray wavelength range are produced by insertion devices installed in specially designed third-generation storage rings. There is the possibility of producing photon beams that are orders of magnitude brighter than presently achieved at synchrotron sources, by using self-amplified spontaneous emission (SASE). At the Advanced Photon Source (APS), the low-energy undulator test line (LEUTL) free-electron laser (FEL) project was built to explore the SASE process in the visible through vacuum ultraviolet wavelength range. While the understanding gained in these experiments will guide future work to extend SASE FELs to shorter wavelengths, the APS FEL itself will become a continuously tunable, bright light source. Measurements of the SASE process to saturation have been made at 530 and 385 nm. A number of quantities were measured to confirm our understanding of the SASE process and to verify that saturation was reached. The intensity of the FEL light was measured versus distance along the FEL, and was found to flatten out at saturation. The statistical variation of the light intensity was found to be wide in the exponential gain region where the intensity is expected to be noisy, and narrower once saturation was reached. Absolute power measurements compare well with GINGER simulations. The FEL light spectrum at different distances along the undulator line was measured with a high-resolution spectrometer, and the many sharp spectral spikes at the beginning of the SASE process coalesce into a single peak at saturation. The energy spread in the electron beam widens markedly after saturation due to the number of electrons that transfer a significant amount of energy to the photon beam. Coherent transition radiation measurements of the electron beam as it strikes a foil provide additional confirmation of the microbunching of the electron beam. The quantities measured confirm that saturation was indeed reached. Details are given in Milton et al., Science 292, 2037 (2001) (also online at www.sciencexpress.org as 10.1126/science. 1059955, 17 May 2001), and Lewellen et al., "Present Status and Recent Results from the APS SASE FEL," to be published in the Proceedings of the 23rd International Free-Electron Laser Conference, Darmstadt, Germany, 20?24 August 2001.
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title: Investigations of electron-beam microbunching and beam coalignment using CTR in a high-gain SASE FEL
format: conference proceeding
conference: PAC 2001
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: Exponential gain and saturation of a self-amplified spontaneous emission free-electron laser
format: journal article
publisher: Science
year: 2001
32 authors: S. V. Milton | E. Gluskin | N. D. Arnold | C. Benson | W. Berg | S. G. Biedron | M. Borland | Y. C. Chae | R. J. Dejus | P.K. Den Hartog | B. Deriy | M. Erdmann | Y. I. Eidelman | M. W. Hahne | Z. Huang | K. J. Kim | J. W. Lewellen | Y. Li | A. H. Lumpkin | O. Makarov | E. R. Moog | A. Nassiri | V. Sajaev | R. Soliday | B. J. Tieman | E. M. Trakhtenberg | G. Travish | I. B. Vasserman | G. Wiemerslage | B. X. Yang | N. A. Vinokurov | X. J. Wang
abstract: Self-amplified spontaneous emission in a free-electron laser has been proposed for the generation of very high brightness coherent X-rays. This process involves passing a high-energy, high-charge, short-pulse, low-energy-spread, and low-emittance electron beam through the periodic magnetic field of a long series of high-quality undulator magnets. The radiation produced grows exponentially in intensity until it reaches a saturation point. We report on the demonstration of self-amplified spontaneous emission gain, exponential growth, and saturation at visible (530 nanometers) and ultraviolet (385 nanometers) wavelengths. Good agreement between theory and simulation indicates that scaling to much shorter wavelengths may be possible. These results confirm the physics behind the self-amplified spontaneous emission process and forward the development of an operational X-ray free-electron laser. (30 References).
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title: Observation and analysis of self-amplified spontaneous emission at the APS low-energy undulator test line
format: conference proceeding
conference: FEL 2000 22nd
year: 2001
153 authors: N. D. Arnold | J. Attig | G. Banks | R. Bechtold | K. Beczek | C. Benson | S. Berg | W. Berg | S. G. Biedron | J. A. Biggs | M. Borland | K. Boerste | M. Bosek | W. R. Brzowski | J. Budz | J. A. Carwardine | P. Castro | Y. C. Chae | S. Christensen | C. Clark | M. Conde | E. A. Crosbie | G. A. Decker | R. J. Dejus | H. DeLeon | P. K. Den Hartog | B. N. Deriy | D. Dohan | P. Dombrowski | D. Donkers | C. L. Doose | R. J. Dortwegt | G. A. Edwards | Y. Eidelman | M. J. Erdmann | J. Error | R. Ferry | R. Flood | J. Forrestal | H. Freund | H. Friedsam | J. Gagliano | W. Gai | J. N. Galayda | R. Gerig | R. L. Gilmore | E. Gluskin | G. A. Goeppner | J. Goetzen | C. Gold | A. J. Gorski | A. E. Grelick | M. W. Hahne | S. Hanuska | K. C. Harkay | G. Harris | A. L. Hillman | R. Hogrefe | J. Hoyt | Z. Huang | J. M. Jagger | W. G. Jansma | M. Jaski | S. J. Jones | R. T. Keane | A. L. Kelly | C. Keyser | K. J. Kim | S. H. Kim | M. Kirshenbaum | J. H. Klick | K. Knoerzer | R. J. Koldenhoven | M. Knott | S. Labuda | R. Laird | J. Lang | F. Lenkszus | E. S. Lessner | J. W. Lewellen | Y. Li | R. M. Lill | A. H. Lumpkin | O. A. Makarov | G. M. Markovich | M. McDowell | W. P. McDowell | P. E. McNamara | T. Meier | D. Meyer | W. Michalek | S. V. Milton | H. Moe | E. R. Moog | L. Morrison | A. Nassiri | J. R. Noonan | R. Otto | J. Pace | S. J. Pasky | J. M. Penicka | A. F. Pietryla | G. Pile | C. Pitts | J. Power | T. Powers | C. C. Putnam | A. J. Puttkammer | D. Reigle | L. Reigle | D. Ronzhin | E. R. Rotela | E. F. Russell | V. Sajaev | S. Sarkar | J. C. Scapino | K. Schroeder | R. A. Seglem | N. S. Sereno | S. K. Sharma | J. F. Sidarous | O. Singh | T. L. Smith | R. Soliday | G. A. Sprau | S. J. Stein | B. Stejskal | V. Svirtun | L. C. Teng | E. Theres | M.C. Thompson | B. J. Tieman | J. A. Torres | E. M. Trakhtenberg | G. Travish | G. F. Trento | J. Vacca | I. B. Vasserman | N. A. Vinokurov | D. R. Walters | Wang, J. | X. J. Wang | J. Warren | S. Wesling | D. L. Weyer | G. Wiemerslage | K. Wilhelmi | R. Wright | D. Wyncott | S. Xu | B. X. Yang | W. Yoder | R. B. Zabel
abstract: Exponential growth of self-amplified spontaneous emission at 530 nm was first experimentally observed at the Advanced Photon Source low-energy undulator test line in December 1999. Since then, further detailed measurements and analysis of the results have been made. Here, we present the measurements and compare these with calculations based on measured electron beam properties and theoretical expectations. (31 References).
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title: Observation and analysis of self-amplified spontaneous emission at the APS low-energy undulator test line
format: conference proceeding
conference: FEL 2000 22nd
year: 2001
153 authors: N. D. Arnold | J. Attig | G. Banks | R. Bechtold | K. Beczek | C. Benson | S. Berg | W. Berg | S. G. Biedron | J. A. Biggs | M. Borland | K. Boerste | M. Bosek | W. R. Brzowski | J. Budz | J. A. Carwardine | P. Castro | Y. C. Chae | S. Christensen | C. Clark | M. Conde | E. A. Crosbie | G. A. Decker | R. J. Dejus | H. DeLeon | P. K. Den Hartog | B. N. Deriy | D. Dohan | P. Dombrowski | D. Donkers | C. L. Doose | R. J. Dortwegt | G. A. Edwards | Y. Eidelman | M. J. Erdmann | J. Error | R. Ferry | R. Flood | J. Forrestal | H. Freund | H. Friedsam | J. Gagliano | W. Gai | J. N. Galayda | R. Gerig | R. L. Gilmore | E. Gluskin | G. A. Goeppner | J. Goetzen | C. Gold | A. J. Gorski | A. E. Grelick | M. W. Hahne | S. Hanuska | K. C. Harkay | G. Harris | A. L. Hillman | R. Hogrefe | J. Hoyt | Z. Huang | J. M. Jagger | W. G. Jansma | M. Jaski | S. J. Jones | R. T. Keane | A. L. Kelly | C. Keyser | K. J. Kim | S. H. Kim | M. Kirshenbaum | J. H. Klick | K. Knoerzer | R. J. Koldenhoven | M. Knott | S. Labuda | R. Laird | J. Lang | F. Lenkszus | E. S. Lessner | J. W. Lewellen | Y. Li | R. M. Lill | A. H. Lumpkin | O. A. Makarov | G. M. Markovich | M. McDowell | W. P. McDowell | P. E. McNamara | T. Meier | D. Meyer | W. Michalek | S. V. Milton | H. Moe | E. R. Moog | L. Morrison | A. Nassiri | J. R. Noonan | R. Otto | J. Pace | S. J. Pasky | J. M. Penicka | A. F. Pietryla | G. Pile | C. Pitts | J. Power | T. Powers | C. C. Putnam | A. J. Puttkammer | D. Reigle | L. Reigle | D. Ronzhin | E. R. Rotela | E. F. Russell | V. Sajaev | S. Sarkar | J. C. Scapino | K. Schroeder | R. A. Seglem | N. S. Sereno | S. K. Sharma | J. F. Sidarous | O. Singh | T. L. Smith | R. Soliday | G. A. Sprau | S. J. Stein | B. Stejskal | V. Svirtun | L. C. Teng | E. Theres | M.C. Thompson | B. J. Tieman | J. A. Torres | E. M. Trakhtenberg | G. Travish | G. F. Trento | J. Vacca | I. B. Vasserman | N. A. Vinokurov | D. R. Walters | Wang, J. | X. J. Wang | J. Warren | S. Wesling | D. L. Weyer | G. Wiemerslage | K. Wilhelmi | R. Wright | D. Wyncott | S. Xu | B. X. Yang | W. Yoder | R. B. Zabel
abstract: Exponential growth of self-amplified spontaneous emission at 530 nm was first experimentally observed at the Advanced Photon Source low-energy undulator test line in December 1999. Since then, further detailed measurements and analysis of the results have been made. Here, we present the measurements and compare these with calculations based on measured electron beam properties and theoretical expectations. (31 References).
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title: Observation of self-amplified spontaneous emission and exponential growth at 530 nm
format: journal article
publisher: Physical Review Letters
year: 2000
50 authors: S. V. Milton | E. Gluskin | S. G. Biedron | R. J. Dejus | P. K. Den Hartog | J. N. Galayda | K. J. Kim | J. W. Lewellen | E. R. Moog | V. Sajaev | N. S. Sereno | G. Travish | N. A. Vinokurov | N. D. Arnold | C. Benson | W. Berg | J. A. Biggs | M. Borland | J. A. Carwardine | Y. C. Chae | G. Decker | B. N. Deriy | M. J. Erdmann | H. Friedsam | C. Gold | A. E. Grelick | M. W. Hahne | K. C. Harkay | Z. Huang | E. S. Lessner | R. M. Lill | A. H. Lumpkin | O. A. Makarov | G. M. Markovich | D. Meyer | A. Nassiri | J. R. Noonan | S. J. Pasky | G. Pile | T. L. Smith | R. Soliday | B. J. Tieman | E. M. Trakhtenberg | G. F. Trento | I. B. Vasserman | D. R. Walters | X. J. Wang | G. Wiemerslage | S. Xu | B. X. Yang
abstract: Experimental evidence for self-amplified spontaneous emission (SASE) at 530 nm is reported. The measurements were made at the low-energy undulator test line facility at the Advanced Photon Source, Argonne National Laboratory. The experimental setup and details of the experimental results are presented, as well as preliminary analysis. This experiment extends to shorter wavelengths the operational knowledge of a linac-based SASE free-electron laser and explicitly shows the predicted exponential growth in intensity of the optical pulse as a function of length along the undulator. (20 References).
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title: The operation of the BNL/ATF GUN-IV photocathode RF gun at the Advanced Photon Source
format: conference proceeding
conference: PAC 1999
year: 1999
18 authors: S. G. Biedron | G. A. Goeppner | J. W. Lewellen | S. V. Milton | A. Nassiri | G. Travish | X. J. Wang | N. D. Arnold | W. J. Berg | M. Babzien | C. L. Doose | R. J. Dortwegt | A. Grelick | J. N. Galayda | G. M. Markovich | S. J. Pasky | J. G. Power | B. X. Yang
abstract: At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an RF photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the high-brightness, low-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 mu J of UV in a 1-10 ps pulse at up to a 10-Hz repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of this gun with the APS are discussed. (8 References).
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title: The FEL development at the Advanced Photon Source
format: conference proceeding
conference: Free-Electron Laser Challenges II
year: 1999
4 authors: S. V. Milton | N. D. Arnold | C. Benson | S. Berg
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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