2011 Particle Accelerator Conference - List of Authors (van Tilborg, J.)

Paper	Title	Page
MOP084	A High Repetition Plasma Mirror for Staged Electron Acceleration	256
	T. Sokollik, E.S. Evans, A.J. Gonsalves, W. Leemans, C. Lin, K. Nakamura, J. Osterhoff, S. Shiraishi, C. Tóth, J. van Tilborg LBNL, Berkeley, California, USA
	Funding: Acknowledgment: This work is supported by the National Science Foundation and DTRA. In order to build a compact, staged laser plasma accelerator the in-coupling of the laser beam to the different stages represents one of the key issues. To limit the spatial foot print and thus to realize a high overall acceleration gradient, a concept has to be found which realizes this in-coupling within a few centimeters. We present experiments on a tape-drive based plasma mirror which could be used to reflect the focused laser beam into the acceleration stage. References: * W. Leemans et. al, Phys. Today, 62, 44 (2009) G. Doumy et. al, Phys. Rev. E 69, 026402 (2004) * B. Dromey et. al,, Rev. Sci. Instrum. 75, 645 (2004)

MOP161	Undulator-based Laser Wakefield Accelerator Electron Beam Diagnostic	397
	M.S. Bakeman, E. Esarey, W. Leemans, K. Nakamura, J. Osterhoff, K.E. Robinson, C.B. Schroeder, C. Tóth, J. van Tilborg LBNL, Berkeley, California, USA F.J. Grüner, R. Weingartner LMU, Garching, Germany
	Funding: This work is supported by DTRA and DOE-HEP. The design and current status of experiments to cou- ple the Tapered Hybrid Undulator (THUNDER) to the Lawrence Berkeley National Laboratory (LBNL) laser plasma accelerator (LPA) to measure electron beam energy spread and emittance are presented. * W.P. Leemans et al., Nature Physics, Volume 2, Issue 10, pp. 696-699 (2006). C.B. Schroeder et al., Proceedings AAC08 Conference (2008). * F. Grüner et al., Appl. Phys. B, 86(3):431–435 (2007).

MOP229	Electron Bunch Characterization using Temporal Electric-field Cross-correlation	534
	N.H. Matlis, W. Leemans, G.R.D. Plateau, J. van Tilborg LBNL, Berkeley, California, USA
	Funding: Work supported by DARPA and by the Office of Science, Office of High Energy Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 A new single-shot diagnostic is presented for mapping THz spatiotemporal waveforms with high temporal resolu- tion for use in diagnostics of electron bunch temporal pro- files. The THz waveform is encoded using electro-optic sampling onto either the phase or amplitude of a broadband chirped probe pulse, and is recovered using linear spectral interferometry with a temporally-short reader pulse. The technique was used to measure waveforms of coherent, ultrashort THz pulses emitted by electron bunches from a laser-plasma accelerator with sub-50 fs resolution. The presence of strong spatiotemporal coupling in the THz waveforms and of complex temporal electron bunch structure was determined.

MOP230	Precise Charge Measurement for Laser Plasma Accelerators	537
	K. Nakamura, W.E. Byrne, R.J. Donahue, A.J. Gonsalves, C. Lin, J. Osterhoff, D.E. Rodgers, A.R. Smith, T. Sokollik, J. van Tilborg LBNL, Berkeley, California, USA W. Leemans UCB, Berkeley, California, USA S. Shiraishi Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA
	Funding: Work supported by the Office of Science, Office of High Energy Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Cross-calibrations of charge diagnostics are conducted to verify their validity for measuring electron beams produced by laser plasma accelerators (LPAs). Employed diagnostics are a scintillating screen, activation based mea- surement, and integrating current transformer. The diagnostics agreed within ±8 %, showing that they can provide accurate charge measurements for LPAs provided they are used properly.

Paper

Title

Page

A High Repetition Plasma Mirror for Staged Electron Acceleration

256

T. Sokollik, E.S. Evans, A.J. Gonsalves, W. Leemans, C. Lin, K. Nakamura, J. Osterhoff, S. Shiraishi, C. Tóth, J. van Tilborg
LBNL, Berkeley, California, USA

Funding: Acknowledgment: This work is supported by the National Science Foundation and DTRA.
In order to build a compact, staged laser plasma accelerator the in-coupling of the laser beam to the different stages represents one of the key issues. To limit the spatial foot print and thus to realize a high overall acceleration gradient, a concept has to be found which realizes this in-coupling within a few centimeters. We present experiments on a tape-drive based plasma mirror which could be used to reflect the focused laser beam into the acceleration stage.
References:
* W. Leemans et. al, Phys. Today, 62, 44 (2009)
** G. Doumy et. al, Phys. Rev. E 69, 026402 (2004)
*** B. Dromey et. al,, Rev. Sci. Instrum. 75, 645 (2004)

MOP161

Undulator-based Laser Wakefield Accelerator Electron Beam Diagnostic

397

M.S. Bakeman, E. Esarey, W. Leemans, K. Nakamura, J. Osterhoff, K.E. Robinson, C.B. Schroeder, C. Tóth, J. van Tilborg
LBNL, Berkeley, California, USA
F.J. Grüner, R. Weingartner
LMU, Garching, Germany

Funding: This work is supported by DTRA and DOE-HEP.
The design and current status of experiments to cou- ple the Tapered Hybrid Undulator (THUNDER) to the Lawrence Berkeley National Laboratory (LBNL) laser plasma accelerator (LPA) to measure electron beam energy spread and emittance are presented.
* W.P. Leemans et al., Nature Physics, Volume 2, Issue 10, pp. 696-699 (2006).
** C.B. Schroeder et al., Proceedings AAC08 Conference (2008).
*** F. Grüner et al., Appl. Phys. B, 86(3):431–435 (2007).

MOP229

Electron Bunch Characterization using Temporal Electric-field Cross-correlation

534

N.H. Matlis, W. Leemans, G.R.D. Plateau, J. van Tilborg
LBNL, Berkeley, California, USA

Funding: Work supported by DARPA and by the Office of Science, Office of High Energy Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
A new single-shot diagnostic is presented for mapping THz spatiotemporal waveforms with high temporal resolu- tion for use in diagnostics of electron bunch temporal pro- files. The THz waveform is encoded using electro-optic sampling onto either the phase or amplitude of a broadband chirped probe pulse, and is recovered using linear spectral interferometry with a temporally-short reader pulse. The technique was used to measure waveforms of coherent, ultrashort THz pulses emitted by electron bunches from a laser-plasma accelerator with sub-50 fs resolution. The presence of strong spatiotemporal coupling in the THz waveforms and of complex temporal electron bunch structure was determined.

MOP230

Precise Charge Measurement for Laser Plasma Accelerators

537

K. Nakamura, W.E. Byrne, R.J. Donahue, A.J. Gonsalves, C. Lin, J. Osterhoff, D.E. Rodgers, A.R. Smith, T. Sokollik, J. van Tilborg
LBNL, Berkeley, California, USA
W. Leemans
UCB, Berkeley, California, USA
S. Shiraishi
Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA

Funding: Work supported by the Office of Science, Office of High Energy Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Cross-calibrations of charge diagnostics are conducted to verify their validity for measuring electron beams produced by laser plasma accelerators (LPAs). Employed diagnostics are a scintillating screen, activation based mea- surement, and integrating current transformer. The diagnostics agreed within ±8 %, showing that they can provide accurate charge measurements for LPAs provided they are used properly.