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E. Johnson

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13 papers

title: Properties of the ultrashort gain length, self-amplified spontaneous emission free-electron laser in the linear regime and saturation

format: journal article

year: 2003

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

abstract: VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. The experiment was performed at the Accelerator Test Facility at BNL, using a high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding a total gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. Results are compared to the three-dimensional SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL systems. An agreement between simulations and experimental results has been obtained at an unprecedented level of detail.

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title: Results of the VISA SASE FEL Experiment at 840 nm

format: conference procceeding

conference: 24th International Free Electron Laser Conference

year: 2003

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

abstract: VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. A gain length shorter than 18 cm has been obtained, yielding the gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. The results are compared to 3-D SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL system. Detailed agreement between simulations and experimental results is obtained over the wide range of the electron beam parameters.

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title: Properties of an Ultra-Short Gain Length, Saturated, Self-Amplified Spontaneous Emission FEL

format: preprint

year: 2002

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

abstract: The VISA experiment, conducted at the BNL Accelerator Test Facility (ATF), has studied the properties of SASE FEL process in a saturating system. The experiment utilized a high brightness electron beam and a strong focusing undulator. Saturated gain greater than 108, with a power gain length below 18 cm, was obtained at 840 nm. Measurements of FEL gain, spectral and angular properties of SASE radiation are reported, and the results are compared to theory and to start-to-end simulations of the system. FEL performance was found critically dependent on the compression of the electron beam.

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title: Characterization of an 800 nm SASE FEL at saturation

format: conference procceeding

conference: 23rd International Free Electron Laser Conference

year: 2002

24 authors: A. Tremaine | Pedro Frigola | A. Murokh | C. Pellegrini | Sven Reiche | J. B. Rosenzweig | 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

abstract: Visible to Infrared SASE Amplifier is a free electron laser (FEL) designed to saturate at a radiation wavelength of 800 nm within a 4 m long, strong focusing undulator. A large gain is achieved by driving the FEL with 72 MeV, high brightness beam of BNL's accelerator test facility. We present measurements that demonstrate saturation in addition to the frequency spectrum of the FEL radiation. Energy, gain length and spectral characteristics are compared and shown to agree with simulation and theoretical predictions. (16 References).

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title: Visible-infrared self-amplified spontaneous emission amplifier free electron laser undulator

format: unknown

year: 2001

17 authors: R. Carr | M. Cornacchia | P. Emma | Nuhn, H. D. | Poling, B. | Ruland, R. | E. Johnson | G. Rakowsky | Skaritka, J. | Lidia, S. | Duffy, P. | M. Libkind | Pedro Frigola | A. Murokh | C. Pellegrini | J. B. Rosenzweig | A. Tremaine

abstract: The visible-infrared self-amplified spontaneous emission amplifier (VISA) free electron laser (FEL) is an experimental device designed to show self-amplified spontaneous emission (SASE) to saturation in the near infrared to visible light energy range. It generates a resonant wavelength output from 800?600 nm, so that silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is designed to show how SASE FEL theory corresponds with experiment in this wavelength range, using an electron beam with emittance close to that planned for the future Linear Coherent Light Source at SLAC. VISA comprises a 4 m pure permanent magnet undulator with four 99 cm segments, each of 55 periods, 18 mm long. The undulator has distributed focusing built into it, to reduce the average beta function of the 70?85 MeV electron beam to about 30 cm. There are four FODO cells per segment. The permanent magnet focusing lattice consists of blocks mounted on either side of the electron beam, in the undulator gap. The most important undulator error parameter for a free electron laser is the trajectory walk-off, or lack of overlap of the photon and electron beams. Using pulsed wire magnet measurements and magnet shimming, we were able to control trajectory walk-off to less than

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title: Measuring FEL radiation properties at VISA-FEL

format: conference procceeding

conference: 2001 Particle Accelerator Conference

year: 2001

25 authors: A. Murokh | R. Agustsson | Pedro Frigola | C. Pellegrini | Sven 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

abstract: The VISA (Visible to Infrared SASE Amplifier) SASE free electron laser has been successfully operated at the Accelerator Test Facility (ATF) at BNL. High gain and saturation were observed at 840 nm. We describe here the diagnostic system, experimental procedures and data reduction algorithms, as the FEL performance was measured along the length of the undulator. We also discuss selected spectral radiation measurements. (10 References).

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title: Saturation measurements of a visible SASE FEL

format: conference procceeding

conference: 2001 Particle Accelerator Conference

year: 2001

14 authors: A. Tremaine | P. Frigola | A. Murokh | C. Pellegrini | Sven Reiche | J. B. Rosenzweig | M. Babzien | I. Ben-Zvi | E. Johnson | R. Malone | G. Rakowsky | J. Skaritka | X. J. Wang | V. Yakimenko

abstract: VISA (visible to infrared SASE amplifier) is an FEL designed to obtain high gain at a radiation wavelength of 800 nm. Large gain is achieved by driving the FEL with the 71 MeV, high brightness beam of the Accelerator Test Facility (ATF) and using a novel, strong focusing, 4 m long undulator with a gap of 6 mm and a period of 1.8 cm. We report measurements of exponential gain, saturation, and spectra of the FEL radiation intensity. (11 References).

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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 | Sven 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: Intra-undulator measurements at VISA FEL

format: conference procceeding

conference: 22nd International Free Electron Laser Conference

year: 2001

11 authors: A. Murokh | P. Frigola | C. Pellegrini | J. Rosenzweig | A. Tremaine | E. Johnson | X.J. Wang | V. Yakimenko | L. Klaisner | H.-D. Nuhn | A. Toor

abstract: We describe a diagnostics system developed, to measure exponential gain properties and the electron beam dynamics inside the strong focusing 4-m long undulator for the VISA (Visible to Infrared SASE Amplifier) FEL. The technical challenges included working inside the small undulator gap, optimising the electron beam diagnostics in the high background environment of the spontaneous undulator radiation, multiplexing and transporting the photon beam. Initial results are discussed.

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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: A diagnostic system to measure SASE-FEL radiation properties along the 4-meter VISA undulator

format: conference procceeding

conference: 21st International Free Electron Laser Conference

year: 2000

4 authors: A. Murokha | E. Johnson | J. Rosenzweig | A. Tremaine

abstract:

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title: Photon beam diagnostics for VISA FEL

format: conference procceeding

conference: 1999 Particle Accelerator Conference

year: 1999

17 authors: A. Murokh | C. Pellegrini | J. B. Rosenzweig | Pedro Frigola | P. Musumeci | A. Tremaine | M. Babzien | Ben-Zvi, I. | Doyuran, A. | E. Johnson | Skaritka, J. | X. J. Wang | Van Bibber, K. A. | J. M. Hill | Le Sage, G. P. | D. Nguyen | M. Cornacchia

abstract: The VISA (Visible to Infrared SASE Amplifier) project is designed to be a SASE-FEL driven to saturation in the sub-micron wavelength region. Its goal is to test various aspects of the existing theory of self-amplified spontaneous emission, as well as numerical codes. Measurements include: angular and spectral distribution of the FEL light at the exit and inside of the undulator; electron beam micro-bunching using CTR; single-shot time resolved measurements of the pulse profile, using an auto-correlation technique and FROG algorithm. The diagnostics are designed to provide maximum information on the physics of the SASE-FEL process, to ensure a close comparison of the experimental results with theory and simulations. (9 References).

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title: The VISA FEL Undulator

format: conference procceeding

conference: 20th International Free Electron Laser Conference

year: 1999

14 authors: R. Carr | Ben-Zvi, I. | Bertolini, L. | M. Cornacchia | P. Emma | Pedro Frigola | E. Johnson | M. Libkind | Lidia, S. | Nuhn, H. D. | C. Pellegrini | G. Rakowsky | J. B. Rosenzweig | Ruland, R.

abstract: The Visible-Infrared SASE Amplifier (VISA) FEL is an experimental device designed to show self amplified spontaneous emission (SASE) to saturation in the 800-600 nm range, where silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is the first SASE FEL designed to saturate, and its diagnostics will provide important checks of theory.

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title:	Properties of the ultrashort gain length, self-amplified spontaneous emission free-electron laser in the linear regime and saturation
format:	journal article
year:	2003
26 authors:	A. Murokh \| R. Agustsson \| M. Babzien \| I. Ben-Zvi \| L. Bertolini \| K. van Bibber \| R. Carr \| M. Cornacchia \| P. Frigola \| J. Hill \| E. Johnson \| L. Klaisner \| G. Le Sage \| M. Libkind \| R. Malone \| H-D. Nuhn \| C. Pellegrini \| Sven Reiche \| G. Rakowsky \| James Rosenzweig \| R. Ruland \| J. Skaritka \| A. Toor \| A. Tremaine \| X. Wang \| V. Yakimenko
abstract:	VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. The experiment was performed at the Accelerator Test Facility at BNL, using a high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding a total gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. Results are compared to the three-dimensional SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL systems. An agreement between simulations and experimental results has been obtained at an unprecedented level of detail.
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title:	Results of the VISA SASE FEL Experiment at 840 nm
format:	conference procceeding
conference:	24th International Free Electron Laser Conference
year:	2003
26 authors:	A. Murokh \| R. Agustsson \| M. BABZIEN \| I. Ben-Zvi \| L. Bertolini \| K. van Bibber \| R. Carr \| M. Cornacchia \| P. Frigola \| J. Hill \| E. Johnson \| L. Klaisner \| G. Le Sage \| M. Libkind \| R. Malone \| H.-D. Nuhn \| C. Pellegrini \| Sven Reiche \| G. Rakowsky \| J. B. Rosenzweig \| R. Ruland \| J. Skaritka \| A. Toor \| A. Tremaine \| X. Wang \| V. Yakimenko
abstract:	VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. A gain length shorter than 18 cm has been obtained, yielding the gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. The results are compared to 3-D SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL system. Detailed agreement between simulations and experimental results is obtained over the wide range of the electron beam parameters.
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title:	Properties of an Ultra-Short Gain Length, Saturated, Self-Amplified Spontaneous Emission FEL
format:	preprint
year:	2002
26 authors:	A. Murokh \| R. Agustsson \| Pedro Frigola \| C. Pellegrini \| Sven Reiche \| J. B. Rosenzweig \| A. Tremaine \| M. Babzien \| I. Ben-Zvi \| E. Johnson \| R. Malone \| G. Rakowsky \| J. Skaritka \| X. Wang \| V. Yakimenko \| L. Bertolini \| J. M. Hill \| G. P. Le Sage \| M. Libkind \| A. Toor \| K. A. Van Bibber \| R. Carr \| M. Cornacchia \| L. Klaisner \| H. D. Nuhn \| R. Ruland
abstract:	The VISA experiment, conducted at the BNL Accelerator Test Facility (ATF), has studied the properties of SASE FEL process in a saturating system. The experiment utilized a high brightness electron beam and a strong focusing undulator. Saturated gain greater than 108, with a power gain length below 18 cm, was obtained at 840 nm. Measurements of FEL gain, spectral and angular properties of SASE radiation are reported, and the results are compared to theory and to start-to-end simulations of the system. FEL performance was found critically dependent on the compression of the electron beam.
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title:	Characterization of an 800 nm SASE FEL at saturation
format:	conference procceeding
conference:	23rd International Free Electron Laser Conference
year:	2002
24 authors:	A. Tremaine \| Pedro Frigola \| A. Murokh \| C. Pellegrini \| Sven Reiche \| J. B. Rosenzweig \| 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
abstract:	Visible to Infrared SASE Amplifier is a free electron laser (FEL) designed to saturate at a radiation wavelength of 800 nm within a 4 m long, strong focusing undulator. A large gain is achieved by driving the FEL with 72 MeV, high brightness beam of BNL's accelerator test facility. We present measurements that demonstrate saturation in addition to the frequency spectrum of the FEL radiation. Energy, gain length and spectral characteristics are compared and shown to agree with simulation and theoretical predictions. (16 References).
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title:	Visible-infrared self-amplified spontaneous emission amplifier free electron laser undulator
format:	unknown
year:	2001
17 authors:	R. Carr \| M. Cornacchia \| P. Emma \| Nuhn, H. D. \| Poling, B. \| Ruland, R. \| E. Johnson \| G. Rakowsky \| Skaritka, J. \| Lidia, S. \| Duffy, P. \| M. Libkind \| Pedro Frigola \| A. Murokh \| C. Pellegrini \| J. B. Rosenzweig \| A. Tremaine
abstract:	The visible-infrared self-amplified spontaneous emission amplifier (VISA) free electron laser (FEL) is an experimental device designed to show self-amplified spontaneous emission (SASE) to saturation in the near infrared to visible light energy range. It generates a resonant wavelength output from 800?600 nm, so that silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is designed to show how SASE FEL theory corresponds with experiment in this wavelength range, using an electron beam with emittance close to that planned for the future Linear Coherent Light Source at SLAC. VISA comprises a 4 m pure permanent magnet undulator with four 99 cm segments, each of 55 periods, 18 mm long. The undulator has distributed focusing built into it, to reduce the average beta function of the 70?85 MeV electron beam to about 30 cm. There are four FODO cells per segment. The permanent magnet focusing lattice consists of blocks mounted on either side of the electron beam, in the undulator gap. The most important undulator error parameter for a free electron laser is the trajectory walk-off, or lack of overlap of the photon and electron beams. Using pulsed wire magnet measurements and magnet shimming, we were able to control trajectory walk-off to less than
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title:	Measuring FEL radiation properties at VISA-FEL
format:	conference procceeding
conference:	2001 Particle Accelerator Conference
year:	2001
25 authors:	A. Murokh \| R. Agustsson \| Pedro Frigola \| C. Pellegrini \| Sven 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
abstract:	The VISA (Visible to Infrared SASE Amplifier) SASE free electron laser has been successfully operated at the Accelerator Test Facility (ATF) at BNL. High gain and saturation were observed at 840 nm. We describe here the diagnostic system, experimental procedures and data reduction algorithms, as the FEL performance was measured along the length of the undulator. We also discuss selected spectral radiation measurements. (10 References).
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title:	Saturation measurements of a visible SASE FEL
format:	conference procceeding
conference:	2001 Particle Accelerator Conference
year:	2001
14 authors:	A. Tremaine \| P. Frigola \| A. Murokh \| C. Pellegrini \| Sven Reiche \| J. B. Rosenzweig \| M. Babzien \| I. Ben-Zvi \| E. Johnson \| R. Malone \| G. Rakowsky \| J. Skaritka \| X. J. Wang \| V. Yakimenko
abstract:	VISA (visible to infrared SASE amplifier) is an FEL designed to obtain high gain at a radiation wavelength of 800 nm. Large gain is achieved by driving the FEL with the 71 MeV, high brightness beam of the Accelerator Test Facility (ATF) and using a novel, strong focusing, 4 m long undulator with a gap of 6 mm and a period of 1.8 cm. We report measurements of exponential gain, saturation, and spectra of the FEL radiation intensity. (11 References).
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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 \| Sven 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:	Intra-undulator measurements at VISA FEL
format:	conference procceeding
conference:	22nd International Free Electron Laser Conference
year:	2001
11 authors:	A. Murokh \| P. Frigola \| C. Pellegrini \| J. Rosenzweig \| A. Tremaine \| E. Johnson \| X.J. Wang \| V. Yakimenko \| L. Klaisner \| H.-D. Nuhn \| A. Toor
abstract:	We describe a diagnostics system developed, to measure exponential gain properties and the electron beam dynamics inside the strong focusing 4-m long undulator for the VISA (Visible to Infrared SASE Amplifier) FEL. The technical challenges included working inside the small undulator gap, optimising the electron beam diagnostics in the high background environment of the spontaneous undulator radiation, multiplexing and transporting the photon beam. Initial results are discussed.
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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:	A diagnostic system to measure SASE-FEL radiation properties along the 4-meter VISA undulator
format:	conference procceeding
conference:	21st International Free Electron Laser Conference
year:	2000
4 authors:	A. Murokha \| E. Johnson \| J. Rosenzweig \| A. Tremaine
abstract:
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title:	Photon beam diagnostics for VISA FEL
format:	conference procceeding
conference:	1999 Particle Accelerator Conference
year:	1999
17 authors:	A. Murokh \| C. Pellegrini \| J. B. Rosenzweig \| Pedro Frigola \| P. Musumeci \| A. Tremaine \| M. Babzien \| Ben-Zvi, I. \| Doyuran, A. \| E. Johnson \| Skaritka, J. \| X. J. Wang \| Van Bibber, K. A. \| J. M. Hill \| Le Sage, G. P. \| D. Nguyen \| M. Cornacchia
abstract:	The VISA (Visible to Infrared SASE Amplifier) project is designed to be a SASE-FEL driven to saturation in the sub-micron wavelength region. Its goal is to test various aspects of the existing theory of self-amplified spontaneous emission, as well as numerical codes. Measurements include: angular and spectral distribution of the FEL light at the exit and inside of the undulator; electron beam micro-bunching using CTR; single-shot time resolved measurements of the pulse profile, using an auto-correlation technique and FROG algorithm. The diagnostics are designed to provide maximum information on the physics of the SASE-FEL process, to ensure a close comparison of the experimental results with theory and simulations. (9 References).
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title:	The VISA FEL Undulator
format:	conference procceeding
conference:	20th International Free Electron Laser Conference
year:	1999
14 authors:	R. Carr \| Ben-Zvi, I. \| Bertolini, L. \| M. Cornacchia \| P. Emma \| Pedro Frigola \| E. Johnson \| M. Libkind \| Lidia, S. \| Nuhn, H. D. \| C. Pellegrini \| G. Rakowsky \| J. B. Rosenzweig \| Ruland, R.
abstract:	The Visible-Infrared SASE Amplifier (VISA) FEL is an experimental device designed to show self amplified spontaneous emission (SASE) to saturation in the 800-600 nm range, where silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is the first SASE FEL designed to saturate, and its diagnostics will provide important checks of theory.
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