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

Abstract

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. The concept of accelerating electrons with the tremendous electric fields found in lasers has been proposed for decades. However, until recently the realization of such an accelerator was not technologically feasible. Recent advances in the semiconductor industry, as well as advances in laser technology, have now made laser-driven dielectric accelerators imminent. The grating-based accelerator is one proposed design for a dielectric laser-driven accelerator. This design, which was introduced by Plettner, consists of a pair of opposing transparent binary gratings, illustrated in Fig. 1. The teeth of the gratings serve as a phase mask, ensuring a phase synchronicity between the electromagnetic field and the moving particles. The current grating accelerator design has the drive laser incident perpendicular to the substrate, which poses a laser-structure alignment complication. The next iteration of grating structure fabrication seeks to monolithically create anmore » array of grating structures by etching the grating's vacuum channel into a fused silica wafer. With this method it is possible to have the drive laser confined to the plane of the wafer, thus ensuring alignment of the laser-and-structure, the two grating halves, and subsequent accelerator components. There has been previous work using 2-dimensional finite difference time domain (2D-FDTD) calculations to evaluate the performance of the grating accelerator structure. However, this work approximates the grating as an infinite structure and does not accurately model a realizable structure. In this paper, we will present a 3-dimensional frequency-domain simulation of both the infinite and the finite grating accelerator structure. Additionally, we will present a new scheme for a focusing structure based on a perturbation of the accelerating structure. We will present simulations of this proposed focusing structure and quantify the quality of the focusing fields.« less

Authors:
; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1022555
Report Number(s):
SLAC-PUB-14426
TRN: US1104274
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at 2011 Particle Accelerator Conference (PAC'11), New York, NY, 28 Mar - 1 Apr 2011
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; ACCELERATORS; ALIGNMENT; DESIGN; DIELECTRIC MATERIALS; ELECTRIC FIELDS; ELECTROMAGNETIC FIELDS; ELECTRONS; ETCHING; FABRICATION; FOCUSING; LASERS; PERFORMANCE; SILICA; SIMULATION; TEETH; Accelerators,ACCPHY

Citation Formats

Soong, Ken, Peralta, E A, Byer, R L, /Stanford U., Ginzton Lab., Colby, E, and /SLAC. Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure. United States: N. p., 2011. Web.
Soong, Ken, Peralta, E A, Byer, R L, /Stanford U., Ginzton Lab., Colby, E, & /SLAC. Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure. United States.
Soong, Ken, Peralta, E A, Byer, R L, /Stanford U., Ginzton Lab., Colby, E, and /SLAC. 2011. "Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure". United States. https://www.osti.gov/servlets/purl/1022555.
@article{osti_1022555,
title = {Simulation Studies of the Dielectric Grating as an Accelerating and Focusing Structure},
author = {Soong, Ken and Peralta, E A and Byer, R L and /Stanford U., Ginzton Lab. and Colby, E and /SLAC},
abstractNote = {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. The concept of accelerating electrons with the tremendous electric fields found in lasers has been proposed for decades. However, until recently the realization of such an accelerator was not technologically feasible. Recent advances in the semiconductor industry, as well as advances in laser technology, have now made laser-driven dielectric accelerators imminent. The grating-based accelerator is one proposed design for a dielectric laser-driven accelerator. This design, which was introduced by Plettner, consists of a pair of opposing transparent binary gratings, illustrated in Fig. 1. The teeth of the gratings serve as a phase mask, ensuring a phase synchronicity between the electromagnetic field and the moving particles. The current grating accelerator design has the drive laser incident perpendicular to the substrate, which poses a laser-structure alignment complication. The next iteration of grating structure fabrication seeks to monolithically create an array of grating structures by etching the grating's vacuum channel into a fused silica wafer. With this method it is possible to have the drive laser confined to the plane of the wafer, thus ensuring alignment of the laser-and-structure, the two grating halves, and subsequent accelerator components. There has been previous work using 2-dimensional finite difference time domain (2D-FDTD) calculations to evaluate the performance of the grating accelerator structure. However, this work approximates the grating as an infinite structure and does not accurately model a realizable structure. In this paper, we will present a 3-dimensional frequency-domain simulation of both the infinite and the finite grating accelerator structure. Additionally, we will present a new scheme for a focusing structure based on a perturbation of the accelerating structure. We will present simulations of this proposed focusing structure and quantify the quality of the focusing fields.},
doi = {},
url = {https://www.osti.gov/biblio/1022555}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Aug 12 00:00:00 EDT 2011},
month = {Fri Aug 12 00:00:00 EDT 2011}
}

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