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G. P. Le Sage

First Name: G.

Middle Name: PLe

Last Name: Sage

Full Name: G. P. Le Sage

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11 papers

title: Generation of High Brightness X-Rays with the PLEIADES Thomson X-Ray Source

format: conference procceeding

conference: 2003 Particle Accelerator Conference

year: 2003

14 authors: W. J. Brown | S. Anderson | C. P. J. Barty | J. K. Crane | R. R. Cross | D. N. Fittinghoff | F. V. Hartemann | J. Kuba | G. P. Le Sage | D. R. Slaughter | P. T. Springer | A. Tremaine | J. B. Rosenzweig | D. J. Gibson

abstract: The use of short laser pulses to generate high peak intensity, ultra-short x-ray pulses enables exciting new experimental capabilities, such as femtosecond pump-probe experiments used to temporally resolve material structural dynamics on atomic time scales. PLEIADES (Picosecond Laser Electron InterAction for the Dynamic Evaluation of Structures) is a next generation Thomson scattering x-ray source being developed at Lawrence Livermore National Laboratory (LLNL). Ultra-fast picosecond x-rays (10-200 keV) are generated by colliding an energetic electron beam (20-100 MeV) with a high intensity, sub-ps, 800 nm laser pulse. The peak brightness of the source is expected to exceed 1020 photons/s/0.1 bandwidth/mm2/mrad2. Simulations of the electron beam production, transport, and final focus are presented. Electron beam measurements, including emittance and final focus spot size are also presented and compared to simulation results. Measurements of x-ray production are also reported and compared to theoretical calculations.

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title: Electron Beam Production and Characterization for the PLEIADES Thomson X-Ray Source

format: conference procceeding

conference: 10th Advanced Accelerator Concepts Workshop

year: 2002

13 authors: W. J. Brown | F. V. Hartemann | A. Tremaine | P. T. Springer | G. P. Le Sage | C. P. J. Barty | J. B. Rosenzweig | J. K. Crane | R. R. Cross | D. N. Fittinghoff | D. J. Gibson | D. R. Slaughter | S. Anderson

abstract: We report on the performance of an S-band RF photocathode electron gun and accelerator for operation with the PLEIADES Thomson x-ray source at LLNL. Simulations of beam production, transport, and focus are presented. It is shown that a 1 ps, 500 pC electron bunch with a normalized emittance of less than 5 Tcmm-mrad can be delivered to the interaction point. Initial electron measurements are presented. Calculations of expected x-ray flux are also performed, demonstrating an expected peak spectral brightness of 1020 photons/s/mm2/mrad2/0.1% bandwidth. Effects of RF phase jitter are also presented, and planned phase measurements and control methods are discussed.

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title: Space-charge effects in high brightness electron beam emittance measurements

format: journal article

year: 2002

4 authors: S. Anderson | J. B. Rosenzweig | G. P. Le Sage | J. K. Crane

abstract: The measurement of emittance in space-charge dominated, high brightness beam systems is investigated from conceptual, computational, and experimental viewpoints. As the self-field-induced collective motion in the low energy, high brightness beams emitted from photoinjector rf guns are more important in determining the macroscopic beam evolution than thermal spreads in transverse velocity; traditional methods for phase space diagnosis fail in these systems. We discuss the role of space charge forces in a traditional measurement of transverse emittance, the quadrupole scan. The mitigation of these effects by use of multislit- or pepper-pot-based techniques is explained. The results of a direct experimental comparison between quadrupole scanning and slit-based determination of the emittance of a 5 MeV high brightness electron beam are presented. These data are interpreted with the aid of both envelope and multiparticle simulation codes. It is shown that the ratio of the beam's beta function to its transverse plasma wavelength plays a central role in the quadrupole scan results. Methods of determining the presence of systematic errors in quadrupole scan data are discussed.

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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: Ultrafast materials probing with the LLNL Thomson X-ray source

format: conference procceeding

conference: 2002 Linear Accelerator Conference

year: 2002

24 authors: A. Tremaine | S. Anderson | W. Brown | C. Barty | R. Cauble | J. Crane | H. Cynn | C. Ebbers | D. Fittinghoff | D. Gibson | F. Hartemann | I. Jovanovich | J. Kuba | G. P. Le Sage | A. McMahan | R. Minich | J. Moriarty | B. Remington | D. Slaughter | P. Springer | F. H. Steitz | C. S. Yoo | J. B. Rosenzweig | T. Ditmire

abstract: The use of short laser pulses to generate very high brightness, ultra short (fs to ps) x-ray pulses is a topic of great interest. In principle, femtosecond-scale pump-probe experiments can be used to temporally resolve structural dynamics of materials on the time scale of atomic motion. The development of sub?ps x-ray pulses will make possible a wide range of materials and plasma physics studies with unprecedented time resolution. PLEIADES (Picosecond Laser Electron Interaction for Dynamic Evaluation of Structures), the Thomson scattering project at LLNL, will provide such a novel x-ray source of high power using short laser pulses and a high brightness, relativistic electron bunch. The system is based on a 5 mm-mrad normalized emittance photoinjector, 100 MeV electron RF linac, and a 300 mJ, 35 fs solid-state laser system. PLEIADES will produce ultra fast pulses with x-ray energies (60 keV) capable of probing into high-Z metals.

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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: Emittance measurements of the space charge dominated Thomson source photoinjector

format: conference procceeding

conference: 2001 Particle Accelerator Conference

year: 2001

4 authors: S. Anderson | J. B. Rosenzweig | G. P. Le Sage | J. Crane

abstract: The photocathode rf gun test facility in Livermore National Laboratory's Thomson source is described. The quadrupole scan and slit based emittance measurement techniques are used to measure the emittance of the space charge dominated beam. Experimental results are compared with simulation and theoretical calculations. (10 References).

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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: RF photoinjector development for a short-pulse, hard X-ray Thomson scattering source

format: conference procceeding

conference: 9th Advanced Accelerator Concepts Workshop

year: 2001

6 authors: G. P. Le Sage | S. G. Anderson | T. E. Cowan | J. K. Crane | T. Ditmire | J. B. Rosenzweig

abstract: An important motivation in the development of the next generation X-ray light sources is to achieve picosecond and sub-ps pulses of hard X-rays for dynamic studies of a variety of physical, chemical anti biological processes. Present hard X-ray sources are either pulse-width or intensity limited, which allows ps-scale temporal resolution only for signal averaging of highly repetitive processes. A much faster and brighter hard X-ray source is being developed at LLNL, based on Thomson scattering of fs-laser pulses by a relativistic electron beam, which will enable X-ray characterization of the transient structure of a sample in a single shot. Experimental and diagnostic techniques relevant to the development of next generation sources including the Linac Coherent Light Source can be tested with the Thomson scattering hard X-ray source. This source will combine an RF photoinjector with a 100 MeV S-band linac. The photoinjector and linac also provide an ideal test-bed for examining space-charge induced emittance growth effects. A program of beam dynamics and diagnostic experiments are planned in parallel with Thomson source development. Our experimental progress and future plans will be discussed.

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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: Experimental characterization of an ultrafast Thomson scattering x-ray source with three-dimensional time and frequency-domain analysis

format: journal article

year: 2004

18 authors: W. J. Brown | S. G. Anderson | C. P. J. Barty | S. M. Betts | R. Booth | J. K. Crane | R. R. Cross | D. N. Fittinghoff | D. J. Gibson | F. V. Hartemann | E. P. Hartouni | J. Kuba | G. P. Le Sage | D. R. Slaughter | A. M. Tremaine | A. J. Wootton | P. T. Springer | J. B. Rosenzweig

abstract: We present a detailed comparison of the measured characteristics of Thomson backscattered xrays produced at the Picosecond Laser-Electron Interaction for the Dynamic Evaluation of Structures facility at Lawrence Livermore National Laboratory to predicted results from a newly developed, fully three-dimensional time and frequency-domain code. Based on the relativistic differential cross section, this code has the capability to calculate time and space dependent spectra of the x-ray photons produced from linear Thomson scattering for both bandwidth-limited and chirped incident laser pulses. Spectral broadening of the scattered x-ray pulse resulting from the incident laser bandwidth, perpendicular wave vector components in the laser focus, and the transverse and longitudinal phase spaces of the electron beam are included. Electron beam energy, energy spread, and transverse phase space measurements of the electron beam at the interaction point are presented, and the corresponding predicted x-ray characteristics are determined. In addition, time-integrated measurements of the xrays produced from the interaction are presented and shown to agree well with the simulations.

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title:	Generation of High Brightness X-Rays with the PLEIADES Thomson X-Ray Source
format:	conference procceeding
conference:	2003 Particle Accelerator Conference
year:	2003
14 authors:	W. J. Brown \| S. Anderson \| C. P. J. Barty \| J. K. Crane \| R. R. Cross \| D. N. Fittinghoff \| F. V. Hartemann \| J. Kuba \| G. P. Le Sage \| D. R. Slaughter \| P. T. Springer \| A. Tremaine \| J. B. Rosenzweig \| D. J. Gibson
abstract:	The use of short laser pulses to generate high peak intensity, ultra-short x-ray pulses enables exciting new experimental capabilities, such as femtosecond pump-probe experiments used to temporally resolve material structural dynamics on atomic time scales. PLEIADES (Picosecond Laser Electron InterAction for the Dynamic Evaluation of Structures) is a next generation Thomson scattering x-ray source being developed at Lawrence Livermore National Laboratory (LLNL). Ultra-fast picosecond x-rays (10-200 keV) are generated by colliding an energetic electron beam (20-100 MeV) with a high intensity, sub-ps, 800 nm laser pulse. The peak brightness of the source is expected to exceed 1020 photons/s/0.1 bandwidth/mm2/mrad2. Simulations of the electron beam production, transport, and final focus are presented. Electron beam measurements, including emittance and final focus spot size are also presented and compared to simulation results. Measurements of x-ray production are also reported and compared to theoretical calculations.
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title:	Electron Beam Production and Characterization for the PLEIADES Thomson X-Ray Source
format:	conference procceeding
conference:	10th Advanced Accelerator Concepts Workshop
year:	2002
13 authors:	W. J. Brown \| F. V. Hartemann \| A. Tremaine \| P. T. Springer \| G. P. Le Sage \| C. P. J. Barty \| J. B. Rosenzweig \| J. K. Crane \| R. R. Cross \| D. N. Fittinghoff \| D. J. Gibson \| D. R. Slaughter \| S. Anderson
abstract:	We report on the performance of an S-band RF photocathode electron gun and accelerator for operation with the PLEIADES Thomson x-ray source at LLNL. Simulations of beam production, transport, and focus are presented. It is shown that a 1 ps, 500 pC electron bunch with a normalized emittance of less than 5 Tcmm-mrad can be delivered to the interaction point. Initial electron measurements are presented. Calculations of expected x-ray flux are also performed, demonstrating an expected peak spectral brightness of 1020 photons/s/mm2/mrad2/0.1% bandwidth. Effects of RF phase jitter are also presented, and planned phase measurements and control methods are discussed.
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title:	Space-charge effects in high brightness electron beam emittance measurements
format:	journal article
year:	2002
4 authors:	S. Anderson \| J. B. Rosenzweig \| G. P. Le Sage \| J. K. Crane
abstract:	The measurement of emittance in space-charge dominated, high brightness beam systems is investigated from conceptual, computational, and experimental viewpoints. As the self-field-induced collective motion in the low energy, high brightness beams emitted from photoinjector rf guns are more important in determining the macroscopic beam evolution than thermal spreads in transverse velocity; traditional methods for phase space diagnosis fail in these systems. We discuss the role of space charge forces in a traditional measurement of transverse emittance, the quadrupole scan. The mitigation of these effects by use of multislit- or pepper-pot-based techniques is explained. The results of a direct experimental comparison between quadrupole scanning and slit-based determination of the emittance of a 5 MeV high brightness electron beam are presented. These data are interpreted with the aid of both envelope and multiparticle simulation codes. It is shown that the ratio of the beam's beta function to its transverse plasma wavelength plays a central role in the quadrupole scan results. Methods of determining the presence of systematic errors in quadrupole scan data are discussed.
keywords:
Download \| View \| Details \| edit \| delete

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.
keywords:
Download \| View \| Details \| edit \| delete

title:	Ultrafast materials probing with the LLNL Thomson X-ray source
format:	conference procceeding
conference:	2002 Linear Accelerator Conference
year:	2002
24 authors:	A. Tremaine \| S. Anderson \| W. Brown \| C. Barty \| R. Cauble \| J. Crane \| H. Cynn \| C. Ebbers \| D. Fittinghoff \| D. Gibson \| F. Hartemann \| I. Jovanovich \| J. Kuba \| G. P. Le Sage \| A. McMahan \| R. Minich \| J. Moriarty \| B. Remington \| D. Slaughter \| P. Springer \| F. H. Steitz \| C. S. Yoo \| J. B. Rosenzweig \| T. Ditmire
abstract:	The use of short laser pulses to generate very high brightness, ultra short (fs to ps) x-ray pulses is a topic of great interest. In principle, femtosecond-scale pump-probe experiments can be used to temporally resolve structural dynamics of materials on the time scale of atomic motion. The development of sub?ps x-ray pulses will make possible a wide range of materials and plasma physics studies with unprecedented time resolution. PLEIADES (Picosecond Laser Electron Interaction for Dynamic Evaluation of Structures), the Thomson scattering project at LLNL, will provide such a novel x-ray source of high power using short laser pulses and a high brightness, relativistic electron bunch. The system is based on a 5 mm-mrad normalized emittance photoinjector, 100 MeV electron RF linac, and a 300 mJ, 35 fs solid-state laser system. PLEIADES will produce ultra fast pulses with x-ray energies (60 keV) capable of probing into high-Z metals.
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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:	Emittance measurements of the space charge dominated Thomson source photoinjector
format:	conference procceeding
conference:	2001 Particle Accelerator Conference
year:	2001
4 authors:	S. Anderson \| J. B. Rosenzweig \| G. P. Le Sage \| J. Crane
abstract:	The photocathode rf gun test facility in Livermore National Laboratory's Thomson source is described. The quadrupole scan and slit based emittance measurement techniques are used to measure the emittance of the space charge dominated beam. Experimental results are compared with simulation and theoretical calculations. (10 References).
keywords:
Download \| View \| Details \| edit \| delete

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).
keywords:
Download \| View \| Details \| edit \| delete

title:	RF photoinjector development for a short-pulse, hard X-ray Thomson scattering source
format:	conference procceeding
conference:	9th Advanced Accelerator Concepts Workshop
year:	2001
6 authors:	G. P. Le Sage \| S. G. Anderson \| T. E. Cowan \| J. K. Crane \| T. Ditmire \| J. B. Rosenzweig
abstract:	An important motivation in the development of the next generation X-ray light sources is to achieve picosecond and sub-ps pulses of hard X-rays for dynamic studies of a variety of physical, chemical anti biological processes. Present hard X-ray sources are either pulse-width or intensity limited, which allows ps-scale temporal resolution only for signal averaging of highly repetitive processes. A much faster and brighter hard X-ray source is being developed at LLNL, based on Thomson scattering of fs-laser pulses by a relativistic electron beam, which will enable X-ray characterization of the transient structure of a sample in a single shot. Experimental and diagnostic techniques relevant to the development of next generation sources including the Linac Coherent Light Source can be tested with the Thomson scattering hard X-ray source. This source will combine an RF photoinjector with a 100 MeV S-band linac. The photoinjector and linac also provide an ideal test-bed for examining space-charge induced emittance growth effects. A program of beam dynamics and diagnostic experiments are planned in parallel with Thomson source development. Our experimental progress and future plans will be discussed.
keywords:
Download \| View \| Details \| edit \| delete

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).
keywords:
Download \| View \| Details \| edit \| delete

title:	Experimental characterization of an ultrafast Thomson scattering x-ray source with three-dimensional time and frequency-domain analysis
format:	journal article
year:	2004
18 authors:	W. J. Brown \| S. G. Anderson \| C. P. J. Barty \| S. M. Betts \| R. Booth \| J. K. Crane \| R. R. Cross \| D. N. Fittinghoff \| D. J. Gibson \| F. V. Hartemann \| E. P. Hartouni \| J. Kuba \| G. P. Le Sage \| D. R. Slaughter \| A. M. Tremaine \| A. J. Wootton \| P. T. Springer \| J. B. Rosenzweig
abstract:	We present a detailed comparison of the measured characteristics of Thomson backscattered xrays produced at the Picosecond Laser-Electron Interaction for the Dynamic Evaluation of Structures facility at Lawrence Livermore National Laboratory to predicted results from a newly developed, fully three-dimensional time and frequency-domain code. Based on the relativistic differential cross section, this code has the capability to calculate time and space dependent spectra of the x-ray photons produced from linear Thomson scattering for both bandwidth-limited and chirped incident laser pulses. Spectral broadening of the scattered x-ray pulse resulting from the incident laser bandwidth, perpendicular wave vector components in the laser focus, and the transverse and longitudinal phase spaces of the electron beam are included. Electron beam energy, energy spread, and transverse phase space measurements of the electron beam at the interaction point are presented, and the corresponding predicted x-ray characteristics are determined. In addition, time-integrated measurements of the xrays produced from the interaction are presented and shown to agree well with the simulations.
keywords:	pbpl
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