Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure
Name
Hu-2013-Calculation of wakefields in a 17 GHz beam-driven.pdf
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2.08 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Hu, Min
Munroe, Brian James
Shapiro, Michael
Temkin, Richard J.
Date Issued
February 2013
Journal
Physical Review Special Topics - Accelerators and Beams
Publisher
American Physical Society
Citation
Hu, Min et al. “Calculation of Wakefields in a 17 GHz Beam-driven Photonic Band-gap Accelerator Structure.” Physical Review Special Topics - Accelerators and Beams 16.2 (2013).
Version
Final published version
Abstract
We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST Particle Studio, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam through a seven-cell traveling-wave PBG structure. The characteristics of the longitudinal and transverse wakefields, wake potential spectrum, dipole mode distribution, and their quality factors are calculated and analyzed theoretically. Unlike in conventional disk-loaded waveguide (DLW) structures, three dipole modes (TM[subscript 11]-like, TM[subscript 12]-like, and TM[subscript 13]-like) are excited in the PBG structure with comparable initial amplitudes. These modes are separated by less than 4 GHz in frequency and are damped quickly due to low radiative Q factors. Simulations verify that a PBG structure provides wakefield damping relative to a DLW structure. Simulations were done with both single-bunch excitation to determine the frequency spectrum of the wakefields and multibunch excitation to compare to wakefield measurements taken at MIT using a 17 GHz bunch train. These simulation results will guide the design of next-generation high-gradient accelerator PBG structures.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Terms of Use
Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevSTAB.16.022002
