PAC2013 - List of Authors (Qi, M.)

Paper	Title	Page
MOPAC28	Applications for Optical-Scale Dielectric Laser Accelerators	129
	R.J. England, Z. Huang, C. Lee, R.J. Noble, J.E. Spencer, Z. Wu SLAC, Menlo Park, California, USA B. Montazeri, E.A. Peralta, K. Soong Stanford University, Stanford, California, USA M. Qi Purdue University, West Lafayette, Indiana, USA L. Schächter Technion, Haifa, Israel
	Funding: Work supported by U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG06-97ER41276 and by DARPA Grant N66001-11-1-4199. Particle acceleration in dielectric laser-driven micro-structures, recently demonstrated at SLAC*, holds the promise of providing low-cost compact accelerators for a wide variety of uses. Laser-driven undulators based upon this concept could attain very short (mm to sub-mm) periods with multi-Tesla field strengths. And since dielectric laser accelerators (DLAs) operate optimally with optical-scale electron bunch formats, radiation production with high repetition rate (10s of MHz) attosecond-scale pulses is a natural combination. We present preliminary analysis of the harmonic field structure for a periodic undulator based on this concept.

MOPAC33	Silica Rod Array for Laser Driven Particle Acceleration	141
	Z. Wu, R.J. England, R.J. Noble SLAC, Menlo Park, California, USA E.A. Peralta, K. Soong Stanford University, Stanford, California, USA M. Qi Purdue University, West Lafayette, Indiana, USA
	Funding: Work supported by U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG06-97ER41276 and by DARPA Grant N66001-11-1-4199. Laser driven dielectric accelerators possess advantages in their greatly reduced dimensions and costs, larger breakdown threshold, and higher accelerating gradient . Several resonant or waveguide based structures have been proposed . Electron acceleration with 250 MV/m gradient has been demonstrated using a silica grating structure . We describe a new structure of silica rod array for laser driven acceleration. The structure consists of two rows of equally spaced circular or elliptical rods, with a gap between the rows as the particle channel. Similar to the grating, the periodic arrangement of the rods along the channel provides phase reset of the EM fields and thus required phase synchronicity for acceleration. Resonances among rods enhance the near E-field in the channel to achieve high gradient. The structure has been optimized dimensionally in simulations, and exhibited quite uniform net acceleration in the gap region. One advantage of this structure is that the rods are fabricated on one single substrate, therefore positioned and aligned with lithographic level precision. Prototype samples have been fabricated ** for potential laser acceleration experiments. * T. Plettner, R. Byer., Phys. Rev. ST-AB,11:030407,2008. B. Cowan, Phys. Rev. ST-AB,11:011301,2008. * E. Peralta et al, manuscript submitted. **** M. Qi, private communication.

Paper

Title

Page

Applications for Optical-Scale Dielectric Laser Accelerators

129

R.J. England, Z. Huang, C. Lee, R.J. Noble, J.E. Spencer, Z. Wu
SLAC, Menlo Park, California, USA
B. Montazeri, E.A. Peralta, K. Soong
Stanford University, Stanford, California, USA
M. Qi
Purdue University, West Lafayette, Indiana, USA
L. Schächter
Technion, Haifa, Israel

Funding: Work supported by U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG06-97ER41276 and by DARPA Grant N66001-11-1-4199.
Particle acceleration in dielectric laser-driven micro-structures, recently demonstrated at SLAC*, holds the promise of providing low-cost compact accelerators for a wide variety of uses. Laser-driven undulators based upon this concept could attain very short (mm to sub-mm) periods with multi-Tesla field strengths. And since dielectric laser accelerators (DLAs) operate optimally with optical-scale electron bunch formats, radiation production with high repetition rate (10s of MHz) attosecond-scale pulses is a natural combination. We present preliminary analysis of the harmonic field structure for a periodic undulator based on this concept.

MOPAC33

Silica Rod Array for Laser Driven Particle Acceleration

141

Z. Wu, R.J. England, R.J. Noble
SLAC, Menlo Park, California, USA
E.A. Peralta, K. Soong
Stanford University, Stanford, California, USA
M. Qi
Purdue University, West Lafayette, Indiana, USA

Funding: Work supported by U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG06-97ER41276 and by DARPA Grant N66001-11-1-4199.
Laser driven dielectric accelerators possess advantages in their greatly reduced dimensions and costs, larger breakdown threshold, and higher accelerating gradient *. Several resonant or waveguide based structures have been proposed * ** ***. Electron acceleration with 250 MV/m gradient has been demonstrated using a silica grating structure ***. We describe a new structure of silica rod array for laser driven acceleration. The structure consists of two rows of equally spaced circular or elliptical rods, with a gap between the rows as the particle channel. Similar to the grating, the periodic arrangement of the rods along the channel provides phase reset of the EM fields and thus required phase synchronicity for acceleration. Resonances among rods enhance the near E-field in the channel to achieve high gradient. The structure has been optimized dimensionally in simulations, and exhibited quite uniform net acceleration in the gap region. One advantage of this structure is that the rods are fabricated on one single substrate, therefore positioned and aligned with lithographic level precision. Prototype samples have been fabricated **** for potential laser acceleration experiments.
* T. Plettner, R. Byer., Phys. Rev. ST-AB,11:030407,2008.
** B. Cowan, Phys. Rev. ST-AB,11:011301,2008.
*** E. Peralta et al, manuscript submitted.
**** M. Qi, private communication.