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Title: Compact Couplers for Photonic Crystal Laser-Driven Accelerator Structures

Abstract

Photonic crystal waveguides are promising candidates for laser-driven accelerator structures because of their ability to confine a speed-of-light mode in an all-dielectric structure. Because of the difference between the group velocity of the waveguide mode and the particle bunch velocity, fields must be coupled into the accelerating waveguide at frequent intervals. Therefore efficient, compact couplers are critical to overall accelerator efficiency. We present designs and simulations of high-efficiency coupling to the accelerating mode in a three-dimensional photonic crystal waveguide from a waveguide adjoining it at 90{sup o}. We discuss details of the computation and the resulting transmission. We include some background on the accelerator structure and photonic crystal-based optical acceleration in general.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1045202
Report Number(s):
SLAC-PUB-15139
TRN: US1203552
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Conf.Proc.C100523:THPEC013,2010; Conference: 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ACCELERATORS; EFFICIENCY; VELOCITY; WAVEGUIDES; Accelerators,ACCPHY

Citation Formats

Cowan, Benjamin, /Tech-X, Boulder, Lin, M.C., /Tech-X, Boulder, Schwartz, Brian, /Tech-X, Boulder, Byer, Robert, /Stanford U., Phys. Dept., McGuinness, Christopher, /Stanford U., Phys. Dept., Colby, Eric, /SLAC, England, Robert, /SLAC, Noble, Robert, /SLAC, Spencer, James, and /SLAC. Compact Couplers for Photonic Crystal Laser-Driven Accelerator Structures. United States: N. p., 2012. Web.
Cowan, Benjamin, /Tech-X, Boulder, Lin, M.C., /Tech-X, Boulder, Schwartz, Brian, /Tech-X, Boulder, Byer, Robert, /Stanford U., Phys. Dept., McGuinness, Christopher, /Stanford U., Phys. Dept., Colby, Eric, /SLAC, England, Robert, /SLAC, Noble, Robert, /SLAC, Spencer, James, & /SLAC. Compact Couplers for Photonic Crystal Laser-Driven Accelerator Structures. United States.
Cowan, Benjamin, /Tech-X, Boulder, Lin, M.C., /Tech-X, Boulder, Schwartz, Brian, /Tech-X, Boulder, Byer, Robert, /Stanford U., Phys. Dept., McGuinness, Christopher, /Stanford U., Phys. Dept., Colby, Eric, /SLAC, England, Robert, /SLAC, Noble, Robert, /SLAC, Spencer, James, and /SLAC. Mon . "Compact Couplers for Photonic Crystal Laser-Driven Accelerator Structures". United States. doi:. https://www.osti.gov/servlets/purl/1045202.
@article{osti_1045202,
title = {Compact Couplers for Photonic Crystal Laser-Driven Accelerator Structures},
author = {Cowan, Benjamin and /Tech-X, Boulder and Lin, M.C. and /Tech-X, Boulder and Schwartz, Brian and /Tech-X, Boulder and Byer, Robert and /Stanford U., Phys. Dept. and McGuinness, Christopher and /Stanford U., Phys. Dept. and Colby, Eric and /SLAC and England, Robert and /SLAC and Noble, Robert and /SLAC and Spencer, James and /SLAC},
abstractNote = {Photonic crystal waveguides are promising candidates for laser-driven accelerator structures because of their ability to confine a speed-of-light mode in an all-dielectric structure. Because of the difference between the group velocity of the waveguide mode and the particle bunch velocity, fields must be coupled into the accelerating waveguide at frequent intervals. Therefore efficient, compact couplers are critical to overall accelerator efficiency. We present designs and simulations of high-efficiency coupling to the accelerating mode in a three-dimensional photonic crystal waveguide from a waveguide adjoining it at 90{sup o}. We discuss details of the computation and the resulting transmission. We include some background on the accelerator structure and photonic crystal-based optical acceleration in general.},
doi = {},
journal = {Conf.Proc.C100523:THPEC013,2010},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 02 00:00:00 EDT 2012},
month = {Mon Jul 02 00:00:00 EDT 2012}
}

Conference:
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  • We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We demonstrate guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice and discuss the properties of this mode. We also discuss particle beam dynamics in the structure, presenting a novel method for focusing the beam. In addition we describe some potential coupling methods for the structure.
  • We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We describe guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice and discuss the properties of this mode, including particle beam dynamics and potential coupling methods for the structure. We also discuss possible materials and power sources for this structure and their effects on performance parameters, as well as possible manufacturing techniques and the required tolerances. In addition we describe the computational technique and possible improvements in numerical modeling that would aid developmentmore » of photonic crystal structures.« less
  • The authors discuss simulated photonic crystal structure designs for laser-driven particle acceleration. They focus on three-dimensional planar structures based on the so-called ''woodpile'' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice. They introduce a candidate geometry and discuss the properties of the accelerating mode. They also discuss the linear beam dynamics in the structure present a novelmethod for focusing the beam. In addition they describe ongoing investigations of photonic crystal fiber-based structures.
  • Laser-driven acceleration holds great promise for significantly improving accelerating gradient. However, scaling the conventional process of structure-based acceleration in vacuum down to optical wavelengths requires a substantially different kind of structure. We require an optical waveguide that (1) is constructed out of dielectric materials, (2) has transverse size on the order of a wavelength, and (3) supports a mode with speed-of-light phase velocity in vacuum. Photonic crystals---structures whose electromagnetic properties are spatially periodic---can meet these requirements. We discuss simulated photonic crystal accelerator structures and describe their properties. We begin with a class of two-dimensional structures which serves to illustrate themore » design considerations and trade-offs involved. We then present a three-dimensional structure, and describe its performance in terms of accelerating gradient and efficiency. We discuss particle beam dynamics in this structure, demonstrating a method for keeping a beam confined to the waveguide. We also discuss material and fabrication considerations. Since accelerating gradient is limited by optical damage to the structure, the damage threshold of the dielectric is a critical parameter. We experimentally measure the damage threshold of silicon for picosecond pulses in the infrared, and determine that our structure is capable of sustaining an accelerating gradient of 300 MV/m at 1550 nm. Finally, we discuss possibilities for manufacturing these structures using common microfabrication techniques.« less
  • We discuss simulated photonic crystal structure designs for laser-driven particle acceleration. We focus on three-dimensional planar structures based on the so-called 'woodpile' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice. We introduce a candidate geometry and discuss the properties of the accelerating mode. We also discuss the linear beam dynamics in the structure present a novel method for focusing the beam. In addition we describe ongoing investigations of photonic crystal fiber-based structures.