2011 Particle Accelerator Conference - List of Authors (Byer, R.L.)

Paper	Title	Page
MOP095	Experimental Determination of Damage Threshold Characteristics of IR Compatible Optical Materials	277
	K. Soong, E.R. Colby, C. McGuinness SLAC, Menlo Park, California, USA R.L. Byer, E.A. Peralta Stanford University, Stanford, California, USA
	Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC) The accelerating gradient in a laser-driven dielectric accelerating structure is often limited by the laser damage threshold of the structure. For a given laser-driven dielectric accelerator design, we can maximize the accelerating gradient by choosing the best combination of the accelerator’s constituent material and operating wavelength. We present here a model of the damage mechanism from ultrafast infrared pulses and compare that model with experimental measurements of the damage threshold of bulk silicon. Additionally, we present experimental measurements of a variety of candidate materials, thin films, and nanofabricated accelerating structures.

MOP096	Fabrication and Measurement of Dual Layer Silica Grating Structures for Direct Laser Acceleration	280
	E.A. Peralta, R.L. Byer Stanford University, Stanford, California, USA E.R. Colby, R.J. England, C. McGuinness, K. Soong SLAC, Menlo Park, California, USA
	Funding: Department of Energy: DE-AC02-76SF00515(SLAC),DE-FG06-97ER41276 We present our progress in the fabrication and measurement of a transmission-based dielectric double-grating accelerator structure. The structure lends itself to simpler coupling to the accelerating mode in the waveguide with negligible group velocity dispersion effects, allowing for operation with ultra-short (fs) laser pulses. This document describes work being done at the Stanford Nanofabrication Facility to create a monolithic guided-wave structure with 800 nm period gratings separated by a fixed sub-wavelength gap using standard optical lithographic techniques on a fused silica substrate. An SEM and other characterization tools were used to measure the fabrication deviations of the grating geometry and simulations were carried out in MATLAB and HFSS to study the effects of such deviations on the resulting accelerating gradient.

MOP104	Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure	292
	K. Soong, E.R. Colby SLAC, Menlo Park, California, USA R.L. Byer, E.A. Peralta Stanford University, Stanford, California, USA
	Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC) A grating-based design is a promising candidate for a laser-driven dielectric accelerator. Through simulations, we show the merits of a readily fabricated grating structure as an accelerating component. Additionally, we show that with a small design perturbation, the accelerating component can be converted into a focusing structure. The understanding of these two components is critical in the successful development of any complete accelerator.

MOP133	Fabrication and Measurements of a Silicon Woodpile Accelerator Structure	343
	C. McGuinness, E.R. Colby, R.J. England, R. Laouar, R.J. Noble, K. Soong, J.E. Spencer, Z. Wu, D. Xu SLAC, Menlo Park, California, USA R.L. Byer, E.A. Peralta Stanford University, Stanford, California, USA
	Funding: DOE grants: DE-AC02-76SF00515 and DE-FG03-97ER41043-II We present results for the fabrication of a silicon woodpile accelerator structure. The structure was designed to have an accelerating mode at 3.95 μm, with a high characteristic impedance and an accelerating gradient of 530 MeV/m. The fabrication process uses standard nanofabrication techniques in a layer-by-layer process to produce a three-dimensional photonic crystal with 400 nm features. Reflection spectroscopy measurements reveal a peak spanning from three to five microns, and are show good agreement with simulations. * Sears, PRST-AB, 11, 101301, (2008). Cowan, PRST-AB, 11, 011301, (2008). * McGuinness, J. Mod. Opt., vol. 56, is. 18, pp. 2142, (2009). **** Lin, Nature, 394, pp. 251 (1998).

Paper

Title

Page

Experimental Determination of Damage Threshold Characteristics of IR Compatible Optical Materials

277

K. Soong, E.R. Colby, C. McGuinness
SLAC, Menlo Park, California, USA
R.L. Byer, E.A. Peralta
Stanford University, Stanford, California, USA

Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC)
The accelerating gradient in a laser-driven dielectric accelerating structure is often limited by the laser damage threshold of the structure. For a given laser-driven dielectric accelerator design, we can maximize the accelerating gradient by choosing the best combination of the accelerator’s constituent material and operating wavelength. We present here a model of the damage mechanism from ultrafast infrared pulses and compare that model with experimental measurements of the damage threshold of bulk silicon. Additionally, we present experimental measurements of a variety of candidate materials, thin films, and nanofabricated accelerating structures.

MOP096

Fabrication and Measurement of Dual Layer Silica Grating Structures for Direct Laser Acceleration

280

E.A. Peralta, R.L. Byer
Stanford University, Stanford, California, USA
E.R. Colby, R.J. England, C. McGuinness, K. Soong
SLAC, Menlo Park, California, USA

Funding: Department of Energy: DE-AC02-76SF00515(SLAC),DE-FG06-97ER41276
We present our progress in the fabrication and measurement of a transmission-based dielectric double-grating accelerator structure. The structure lends itself to simpler coupling to the accelerating mode in the waveguide with negligible group velocity dispersion effects, allowing for operation with ultra-short (fs) laser pulses. This document describes work being done at the Stanford Nanofabrication Facility to create a monolithic guided-wave structure with 800 nm period gratings separated by a fixed sub-wavelength gap using standard optical lithographic techniques on a fused silica substrate. An SEM and other characterization tools were used to measure the fabrication deviations of the grating geometry and simulations were carried out in MATLAB and HFSS to study the effects of such deviations on the resulting accelerating gradient.

MOP104

Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure

292

K. Soong, E.R. Colby
SLAC, Menlo Park, California, USA
R.L. Byer, E.A. Peralta
Stanford University, Stanford, California, USA

Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC)
A grating-based design is a promising candidate for a laser-driven dielectric accelerator. Through simulations, we show the merits of a readily fabricated grating structure as an accelerating component. Additionally, we show that with a small design perturbation, the accelerating component can be converted into a focusing structure. The understanding of these two components is critical in the successful development of any complete accelerator.

MOP133

Fabrication and Measurements of a Silicon Woodpile Accelerator Structure

343

C. McGuinness, E.R. Colby, R.J. England, R. Laouar, R.J. Noble, K. Soong, J.E. Spencer, Z. Wu, D. Xu
SLAC, Menlo Park, California, USA
R.L. Byer, E.A. Peralta
Stanford University, Stanford, California, USA

Funding: DOE grants: DE-AC02-76SF00515 and DE-FG03-97ER41043-II
We present results for the fabrication of a silicon woodpile accelerator structure. The structure was designed to have an accelerating mode at 3.95 μm, with a high characteristic impedance and an accelerating gradient of 530 MeV/m. The fabrication process uses standard nanofabrication techniques in a layer-by-layer process to produce a three-dimensional photonic crystal with 400 nm features. Reflection spectroscopy measurements reveal a peak spanning from three to five microns, and are show good agreement with simulations.
* Sears, PRST-AB, 11, 101301, (2008).
** Cowan, PRST-AB, 11, 011301, (2008).
*** McGuinness, J. Mod. Opt., vol. 56, is. 18, pp. 2142, (2009).
**** Lin, Nature, 394, pp. 251 (1998).