2011 Particle Accelerator Conference - Classification: Advanced Concepts and Future Directions / Tech 15: Insertion Devices (Undulators and Wigglers)

Paper	Title	Page
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).

MOP162	Betatron Radiation from an Off-axis Electron Beam in the Plasma Wakefield Accelerator	400
	Y. Shi, O. Chang, P. Muggli USC, Los Angeles, California, USA W. An, C. Huang, W.B. Mori UCLA, Los Angeles, California, USA
	Funding: supported by US DoE In the non-linear or blow-out regime of a plasma wakefield, the electrons of the accelerated bunch oscillate in a pure ion column. It was demonstrated that a single bunch can emit betatron radiation in the keV to MeV range. In a drive/witness bunch system, the witness bunch can be injected into the ion column with a transverse momentum or initial radial offset, so that the whole bunch oscillates about the column axis as one marcro-electron. This results in a larger emitted power and higher photon energy. The energy loss due to radiation can be compensated for by the energy gain from the wakefield so that the emission process can be sustained over long distance. Detailed results will be presented about the characteristics of the witness bunch oscillations and radiation through numerical simulations* and calculations. * S.Q. Wang, et al., Phys. Rev.Let., 88(13), 135004,(2002), D. K. Johnson et al., Phys. Rev. Lett. 97(17), 175003, (2006) ** C.H. Huang, et al., J. Comp. Phys., 217(2), 658, (2006)

Paper

Title

Page

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).

MOP162

Betatron Radiation from an Off-axis Electron Beam in the Plasma Wakefield Accelerator

400

Y. Shi, O. Chang, P. Muggli
USC, Los Angeles, California, USA
W. An, C. Huang, W.B. Mori
UCLA, Los Angeles, California, USA

Funding: supported by US DoE
In the non-linear or blow-out regime of a plasma wakefield, the electrons of the accelerated bunch oscillate in a pure ion column. It was demonstrated that a single bunch can emit betatron radiation in the keV to MeV range*. In a drive/witness bunch system, the witness bunch can be injected into the ion column with a transverse momentum or initial radial offset, so that the whole bunch oscillates about the column axis as one marcro-electron. This results in a larger emitted power and higher photon energy. The energy loss due to radiation can be compensated for by the energy gain from the wakefield so that the emission process can be sustained over long distance. Detailed results will be presented about the characteristics of the witness bunch oscillations and radiation through numerical simulations** and calculations.
* S.Q. Wang, et al., Phys. Rev.Let., 88(13), 135004,(2002), D. K. Johnson et al., Phys. Rev. Lett. 97(17), 175003, (2006)
** C.H. Huang, et al., J. Comp. Phys., 217(2), 658, (2006)