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D. J. Gibson

First Name: D.

Middle Name: J.

Last Name: Gibson

Full Name: D. J. Gibson

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6 papers

title: Ultra-High Density Electron Beams for Beam Radiation and Beam Plasma Interaction

format: conference procceeding

conference: 2005 Particle Accelerator Conference

year:

11 authors: G. Anderson | W.J. Brown | D.J. Gibson | F.V. Hartemann | J.S. Jacob | A.M. Tremaine | J.K. Lim | P. Frigola | P. Musumeci | J.B. Rosenzweig | G. Travish

abstract: Current and future applications of high brightness electron beams, which include advanced accelerators such as the plasma wake-field accelerator (PWFA) and beam radiation interactions such as inverse-Compton scattering (ICS), require both transverse and longitudinal beam sizes on the order of tens of microns. Ultra-high density beams may be produced at moderate energy (50 MeV) by compression and subsequent strong focusing of low emittance, photoinjector sources. We describe the implementation of this method used at the PLEIADES ICS x-ray source in which the photoinjector-generated beam has been compressed to 300 fsec duration using the velocity bunching technique and focused to 20 um rms size using an extremely high gradient, permanent magnet quadrupole (PMQ) focusing system.

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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: Commissioning of a High-Brightness Photoinjector for Compton Scattering X-Ray Sources

format: journal article

year: 2007

13 authors: S. G. Anderson | C. P. J. Barty | D. J. Gibson | F. V. Hartemann | M. Messerly | M. Shverdin | C. W. Siders | A. M. Tremaine | H. Badakov | P. Frigola | A. Fukasawa | B. OShea | J. B. Rosenzweig

abstract: Compton scattering of intense laser pulses with ultra- relativistic electron beams has proven to be an attractive source of high-brightness x-rays with keV to MeV ener- gies. This type of x-ray source requires the electron beam brightness to be comparable with that used in x-ray free- electron lasers and laser and plasma based advanced accel- erators. We describe the development and commissioning of a 1.6 cell RF photoinjector for use in Compton scatter- ing experiments at LLNL. Injector development issues such as RF cavity design, beam dynamics simulations, emit- tance diagnostic development, results of sputtered magne- sium photo-cathode experiments, and UV laser pulse shap- ing are discussed. Initial operation of the photoinjector is described.

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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: Production of femtosecond pulses and

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year:

9 authors: S. G. Anderson | D. J. Gibson | F. V. Hartemann | J. S. Jacob | A. M. Tremaine | J. K. Lim | P. Frigola | J. B. Rosenzweig | G. Travish

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title:	Ultra-High Density Electron Beams for Beam Radiation and Beam Plasma Interaction
format:	conference procceeding
conference:	2005 Particle Accelerator Conference
year:
11 authors:	G. Anderson \| W.J. Brown \| D.J. Gibson \| F.V. Hartemann \| J.S. Jacob \| A.M. Tremaine \| J.K. Lim \| P. Frigola \| P. Musumeci \| J.B. Rosenzweig \| G. Travish
abstract:	Current and future applications of high brightness electron beams, which include advanced accelerators such as the plasma wake-field accelerator (PWFA) and beam radiation interactions such as inverse-Compton scattering (ICS), require both transverse and longitudinal beam sizes on the order of tens of microns. Ultra-high density beams may be produced at moderate energy (50 MeV) by compression and subsequent strong focusing of low emittance, photoinjector sources. We describe the implementation of this method used at the PLEIADES ICS x-ray source in which the photoinjector-generated beam has been compressed to 300 fsec duration using the velocity bunching technique and focused to 20 um rms size using an extremely high gradient, permanent magnet quadrupole (PMQ) focusing system.
keywords:	pbpl
Download \| View \| Details \| edit \| delete

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

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

title:	Commissioning of a High-Brightness Photoinjector for Compton Scattering X-Ray Sources
format:	journal article
year:	2007
13 authors:	S. G. Anderson \| C. P. J. Barty \| D. J. Gibson \| F. V. Hartemann \| M. Messerly \| M. Shverdin \| C. W. Siders \| A. M. Tremaine \| H. Badakov \| P. Frigola \| A. Fukasawa \| B. OShea \| J. B. Rosenzweig
abstract:	Compton scattering of intense laser pulses with ultra- relativistic electron beams has proven to be an attractive source of high-brightness x-rays with keV to MeV ener- gies. This type of x-ray source requires the electron beam brightness to be comparable with that used in x-ray free- electron lasers and laser and plasma based advanced accel- erators. We describe the development and commissioning of a 1.6 cell RF photoinjector for use in Compton scatter- ing experiments at LLNL. Injector development issues such as RF cavity design, beam dynamics simulations, emit- tance diagnostic development, results of sputtered magne- sium photo-cathode experiments, and UV laser pulse shap- ing are discussed. Initial operation of the photoinjector is described.
keywords:	pbpl
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
Download \| View \| Details \| edit \| delete

title:	Production of femtosecond pulses and
format:	journal article
year:
9 authors:	S. G. Anderson \| D. J. Gibson \| F. V. Hartemann \| J. S. Jacob \| A. M. Tremaine \| J. K. Lim \| P. Frigola \| J. B. Rosenzweig \| G. Travish
abstract:
keywords:	pbpl
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