A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator

Wu, Ziran; Lee, Chunghun; Wootton, Kent P.; Ng, Cho-Kuen; Qi, Minghao; England, Robert Joel

doi:10.1109/JSTQE.2015.2477824

Title: A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator

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Abstract

Silicon woodpile photonic crystals provide a base structure that can be used to build a three-dimensional dielectric waveguide system for high-gradient laser driven acceleration. A new woodpile waveguide design that hosts a phase synchronous, centrally confined accelerating mode is proposed. Comparing with previously discovered silicon woodpile accelerating modes, this mode shows advantages in terms of better electron beam loading and higher achievable acceleration gradient. Several traveling-wave coupler design schemes developed for multi-cell RF cavity accelerators are adapted to the woodpile power coupler design for this new accelerating mode. Design of a forward coupled, highly efficient silicon woodpile accelerator is achieved. Simulation shows high efficiency of over 75% of the drive laser power coupled to this fundamental accelerating mode, with less than 15% backward wave scattering. The estimated acceleration gradient, when the coupler structure is driven at the damage threshold fluence of silicon at its operating 1.506 μm wavelength, can reach 185 MV/m. Lastly, a 17-layer woodpile waveguide structure was successfully fabricated, and the measured bandgap is in excellent agreement with simulation.

Authors:: Wu, Ziran; Lee, Chunghun; Wootton, Kent P.; Ng, Cho-Kuen; Qi, Minghao; England, Robert Joel

Publication Date:: Tue Mar 01 00:00:00 EST 2016

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1825169

Alternate Identifier(s):: OSTI ID: 1214428

Grant/Contract Number:: AC02-76SF00515; FG02-13ER41970; N66001-11-1-4199

Resource Type:: Published Article

Journal Name:: IEEE Journal of Selected Topics in Quantum Electronics

Additional Journal Information:: Journal Name: IEEE Journal of Selected Topics in Quantum Electronics Journal Volume: 22 Journal Issue: 2; Journal ID: ISSN 1077-260X

Publisher:: Institute of Electrical and Electronics Engineers

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; couplers; electron accelerators; optical waveguides; photonic crystals; silicon devices

Citation Formats


                    Wu, Ziran, Lee, Chunghun, Wootton, Kent P., Ng, Cho-Kuen, Qi, Minghao, and England, Robert Joel. A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator.  United States: N. p., 2016. 
Web.  doi:10.1109/JSTQE.2015.2477824.

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                    Wu, Ziran, Lee, Chunghun, Wootton, Kent P., Ng, Cho-Kuen, Qi, Minghao, & England, Robert Joel. A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator.  United States.  https://doi.org/10.1109/JSTQE.2015.2477824

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                    Wu, Ziran, Lee, Chunghun, Wootton, Kent P., Ng, Cho-Kuen, Qi, Minghao, and England, Robert Joel. Tue .  
"A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator".  United States.  https://doi.org/10.1109/JSTQE.2015.2477824.

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@article{osti_1825169,

  title        = {A Traveling-Wave Forward Coupler Design for a New Accelerating Mode in a Silicon Woodpile Accelerator},

  author       = {Wu, Ziran and Lee, Chunghun and Wootton, Kent P. and Ng, Cho-Kuen and Qi, Minghao and England, Robert Joel},

  abstractNote = {Silicon woodpile photonic crystals provide a base structure that can be used to build a three-dimensional dielectric waveguide system for high-gradient laser driven acceleration. A new woodpile waveguide design that hosts a phase synchronous, centrally confined accelerating mode is proposed. Comparing with previously discovered silicon woodpile accelerating modes, this mode shows advantages in terms of better electron beam loading and higher achievable acceleration gradient. Several traveling-wave coupler design schemes developed for multi-cell RF cavity accelerators are adapted to the woodpile power coupler design for this new accelerating mode. Design of a forward coupled, highly efficient silicon woodpile accelerator is achieved. Simulation shows high efficiency of over 75% of the drive laser power coupled to this fundamental accelerating mode, with less than 15% backward wave scattering. The estimated acceleration gradient, when the coupler structure is driven at the damage threshold fluence of silicon at its operating 1.506 μm wavelength, can reach 185 MV/m. Lastly, a 17-layer woodpile waveguide structure was successfully fabricated, and the measured bandgap is in excellent agreement with simulation.},

  doi          = {10.1109/JSTQE.2015.2477824},

  journal      = {IEEE Journal of Selected Topics in Quantum Electronics},

  number       = 2,

  volume       = 22,

  place        = {United States},

  year         = {Tue Mar 01 00:00:00 EST 2016},

  month        = {Tue Mar 01 00:00:00 EST 2016}

}

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