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D. C. Nguyen

First Name: D

Middle Name: C

Last Name: Nguyen

Full Name: D. C. Nguyen

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4 papers

title: Initial gain measurements of an 800 nm SASE FEL, VISA

format: conference procceeding

conference: 22nd International Free Electron Laser Conference

year: 2001

26 authors: P. Frigola | A. Murokh | P. Musumeci | C. Pellegrini | S. Reiche | J. B. Rosenzweig | A. Tremaine | M. Babzien | I. Ben-Zvi | E. Johnson | R. Malone | G. Rakowsky | J. Skaritka | X. J. Wang | K. A. Van Bibber | L. Bertolini | J. M. Hill | G. P. Le Sage | M. Libkind | A. Toor | R. Carr | M. Cornacchia | L. Klaisner | H. D. Nuhn | R. Ruland | D. C. Nguyen

abstract: The visible to infrared SASE amplifier (VISA) FEL is designed to obtain high gain at a radiation wavelength of 800 nm. The FEL uses the high brightness electron beam of the accelerator test facility (ATF), with energy of 72 MeV. VISA uses a novel, 4 m long, strong focusing undulator with a gap of 6 mm and a period of 1.8 cm. To obtain large gain the beam and undulator axis have to be aligned to better than 5 mu m. Results from initial measurements on the alignment, gain, and spectrum will be presented and compared to theoretical calculations and simulations. (10 References).

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title: Status and initial commissioning of a high gain 800 nm SASE FEL

format: conference procceeding

conference: 21st International Free Electron Laser Conference

year: 2000

22 authors: A. Tremaine | Pedro Frigola | A. Murokh | P. Musumeci | C. Pellegrini | J. B. Rosenzweig | M. Babzien | Ben-Zvi, I. | E. Johnson | R. Malone | G. Rakowsky | Skaritka, J. | X. J. Wang | Yu, L. H. | Van Bibber, K. A. | J. M. Hill | Le Sage, G. P. | R. Carr | M. Cornacchia | Nuhn, H. D. | Ruland, R. | D. C. Nguyen

abstract: We describe the status and initial commissioning of the visible to infrared SASE amplifier (VISA) experiment. VISA uses a strong focusing 4 m undulator, the Brookhaven National Laboratory ATF linac with an energy of 72 MeV, and a photoinjector electron source. The VISA fundamental radiation wavelength is near 800 nm and the power expected at saturation is near 60 MW. Power, angular and spectral measurements are planned for the VISA radiation and these results will be analyzed and compared with SASE FEL theory and computer simulation. In addition, the induced electron beam micro-bunching will be measured using coherent transition radiation. (12 References).

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title: Measurements of gain larger than 10(5) at 12 mu m in a self-amplified spontaneous-emission free-electron laser

format: unknown

year: 1998

14 authors: Hogan, M. J. | C. Pellegrini | J. B. Rosenzweig | S. Anderson | Pedro Frigola | A. Tremaine | Fortgang, C. | D. C. Nguyen | R. L. Sheffield | Kinross-Wright, J. | A. Varfolomeev | Varfolomeev, A. A. | Tolmachev, S. | R. Carr

abstract: We report measurements of very large output intensities corresponding to a gain larger than 10/sup 5/ for a single pass free-electron laser operating in the self-amplified spontaneous emission (SASE) mode at 12 mu m. We also report the observation and analysis of intensity fluctuations of the SASE radiation intensity in the high-gain regime. The results are compared with theoretical predictions and simulations. (18 References).

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title: Observation of Self-Amplified Spontaneous-Emission-Induced Electron-Beam Microbunching Using Coherent Transition Radiation

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year: 1998

9 authors: A. Tremaine | J. B. Rosenzweig | S. Anderson | Pedro Frigola | Hogan, M. | A. Murokh | C. Pellegrini | D. C. Nguyen | R. L. Sheffield

abstract: We report the measurement of electron-beam microbunching at the exit of a self-amplified spontaneous-emission free-electron laser (SASE FEL), by observation of coherent transition radiation (CTR). The CTR was found to have an angular spectrum much narrower than spontaneous transition radiation and a narrow-band frequency spectrum. The central frequency of the fundamental CTR spectrum is found to differ slightly from that of the SASE, a finding in disagreement with previously invoked CTR theory. The CTR measurement establishes the uniformity of microbunching in the transverse dimension, indicating the SASE FEL operates in a dominant transverse mode.

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title:	Initial gain measurements of an 800 nm SASE FEL, VISA
format:	conference procceeding
conference:	22nd International Free Electron Laser Conference
year:	2001
26 authors:	P. Frigola \| A. Murokh \| P. Musumeci \| C. Pellegrini \| S. Reiche \| J. B. Rosenzweig \| A. Tremaine \| M. Babzien \| I. Ben-Zvi \| E. Johnson \| R. Malone \| G. Rakowsky \| J. Skaritka \| X. J. Wang \| K. A. Van Bibber \| L. Bertolini \| J. M. Hill \| G. P. Le Sage \| M. Libkind \| A. Toor \| R. Carr \| M. Cornacchia \| L. Klaisner \| H. D. Nuhn \| R. Ruland \| D. C. Nguyen
abstract:	The visible to infrared SASE amplifier (VISA) FEL is designed to obtain high gain at a radiation wavelength of 800 nm. The FEL uses the high brightness electron beam of the accelerator test facility (ATF), with energy of 72 MeV. VISA uses a novel, 4 m long, strong focusing undulator with a gap of 6 mm and a period of 1.8 cm. To obtain large gain the beam and undulator axis have to be aligned to better than 5 mu m. Results from initial measurements on the alignment, gain, and spectrum will be presented and compared to theoretical calculations and simulations. (10 References).
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title:	Status and initial commissioning of a high gain 800 nm SASE FEL
format:	conference procceeding
conference:	21st International Free Electron Laser Conference
year:	2000
22 authors:	A. Tremaine \| Pedro Frigola \| A. Murokh \| P. Musumeci \| C. Pellegrini \| J. B. Rosenzweig \| M. Babzien \| Ben-Zvi, I. \| E. Johnson \| R. Malone \| G. Rakowsky \| Skaritka, J. \| X. J. Wang \| Yu, L. H. \| Van Bibber, K. A. \| J. M. Hill \| Le Sage, G. P. \| R. Carr \| M. Cornacchia \| Nuhn, H. D. \| Ruland, R. \| D. C. Nguyen
abstract:	We describe the status and initial commissioning of the visible to infrared SASE amplifier (VISA) experiment. VISA uses a strong focusing 4 m undulator, the Brookhaven National Laboratory ATF linac with an energy of 72 MeV, and a photoinjector electron source. The VISA fundamental radiation wavelength is near 800 nm and the power expected at saturation is near 60 MW. Power, angular and spectral measurements are planned for the VISA radiation and these results will be analyzed and compared with SASE FEL theory and computer simulation. In addition, the induced electron beam micro-bunching will be measured using coherent transition radiation. (12 References).
keywords:
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title:	Measurements of gain larger than 10(5) at 12 mu m in a self-amplified spontaneous-emission free-electron laser
format:	unknown
year:	1998
14 authors:	Hogan, M. J. \| C. Pellegrini \| J. B. Rosenzweig \| S. Anderson \| Pedro Frigola \| A. Tremaine \| Fortgang, C. \| D. C. Nguyen \| R. L. Sheffield \| Kinross-Wright, J. \| A. Varfolomeev \| Varfolomeev, A. A. \| Tolmachev, S. \| R. Carr
abstract:	We report measurements of very large output intensities corresponding to a gain larger than 10/sup 5/ for a single pass free-electron laser operating in the self-amplified spontaneous emission (SASE) mode at 12 mu m. We also report the observation and analysis of intensity fluctuations of the SASE radiation intensity in the high-gain regime. The results are compared with theoretical predictions and simulations. (18 References).
keywords:
Download \| View \| Details \| edit \| delete

title:	Observation of Self-Amplified Spontaneous-Emission-Induced Electron-Beam Microbunching Using Coherent Transition Radiation
format:	unknown
year:	1998
9 authors:	A. Tremaine \| J. B. Rosenzweig \| S. Anderson \| Pedro Frigola \| Hogan, M. \| A. Murokh \| C. Pellegrini \| D. C. Nguyen \| R. L. Sheffield
abstract:	We report the measurement of electron-beam microbunching at the exit of a self-amplified spontaneous-emission free-electron laser (SASE FEL), by observation of coherent transition radiation (CTR). The CTR was found to have an angular spectrum much narrower than spontaneous transition radiation and a narrow-band frequency spectrum. The central frequency of the fundamental CTR spectrum is found to differ slightly from that of the SASE, a finding in disagreement with previously invoked CTR theory. The CTR measurement establishes the uniformity of microbunching in the transverse dimension, indicating the SASE FEL operates in a dominant transverse mode.
keywords:
Download \| View \| Details \| edit \| delete

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