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Z. Huang

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Last Name: Huang

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7 papers
title: FEMTOSECOND X-RAY PULSE GENERATION WITH AN ENERGY CHIRPED ELECTRON BEAM
format: conference proceeding
conference: FEL 2015 37th
year: 2015
7 authors: C. Emma | C. Pellegrini | Y. Ding | G. Marcus | A. Lutman | Z. Huang | A. Marinelli
abstract: We study the generation of short (sub 10 fs) pulses in the X-ray spectral region using an energy chirped electron beam in a Self Amplified Spontaneous Emission Free Electron Laser (SASE FEL) and a self-seeding monochromator [1-4]. The monochromator filters a small bandwidth, short duration pulse from the frequency chirped SASE spectrum. This pulse is used to seed a small fraction of the long chirped beam, hence a short pulse with narrow bandwidth is amplified in the following undulators. We present start-to-end simulation results for LCLS operating in the soft X-ray self-seeded mode with an energy chirp of 1% over 30 fs and a bunch charge of 150 pC. We show the possibility to generate 5 fs pulses with a bandwidth 0.3 eV. We also assess the possibility of further shortening the pulse by utilizing one more chicane after the self-seeding stage and shifting the radiation pulse to a “fresh” part of the electron beam. Experimental study on this short pulse seeding mode has been planned at the LCLS.
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title: Current-Enhanced SASE Using an Optical Laser and its Application to the LCLS
format: conference proceeding
conference: FEL 2004 26th
year: 2004
6 authors: A.A. Zholents | W.M. Fawley | P. Emma | Z. Huang | G. Stupakov | S. Reiche
abstract: We propose a significant enhancement of the electron peak current entering a SASE undulator by inducing an en- ergy modulation in an upstream wiggler magnet via res- onant interaction with an optical laser, followed by mi- crobunching of the energy-modulated electrons at the ac- celerator exit. This current enhancement allows a reduc- tion of the FEL gain length. The x-ray output consists of a series of uniformly spaced spikes, each spike being tem- porally coherent. The duration of this series is controlled by the laser pulse and in principle can be narrowed down to just a single, -attosecond spike. Given potentially absolute temporal synchronization of the x-ray spikes to the energy-modulating laser pulse, this scheme naturally makes pump-probe experiments available to SASE FEL�s. We also study various detrimental effects related to the high electron peak current .
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title: Generation of GW-level, sub-Angstrom Radiation in the LCLS using a Second-Harmonic Radiator
format: conference proceeding
conference: FEL 2004 26th
year: 2004
2 authors: Z. Huang | S. Reiche
abstract: Electron beams are strongly microbunched near the high-gain free-electron laser (FEL) saturation with a rich harmonic content in the beam current. While the coherent harmonic emission is possible in a planar undulator, the third- harmonic radiation typically dominates with about 1% of the fundamental power at saturation. In this paper, we discuss the second-harmonic radiation in the Linac Coherent Light Source. We show that by a suitable design of an second- stage undulator with its fundamental frequency tuned to the second harmonic of the first undulator, coherent second-harmonic radiation much more intense than the third-harmonic is emitted. Numerical simulations predict that GW-level, sub- Angstrom x-ray pulses can be generated in a relatively short second-harmonic radiator.
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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: 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 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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