Wake-field studies on photonic band gap accelerator cavities

Journal Article · Fri Feb 28 23:00:00 EST 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.53024· OSTI ID:587055

Li, D ^[1]; Kroll, N ^[1]; Smith, D R; Schultz, S ^[1]

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1. Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California (United States) 92093-0319

We have studied the wake-field of several metal Photonic Band Gap (PBG) cavities which consist of either a square or a hexagonal array of metal cylinders, bounded on top and bottom by conducting or superconducting sheets, surrounded by placing microwave absorber at the periphery or by replacing outer rows of metal cylinders with lossy dielectric ones, or by metallic walls. A removed cylinder from the center of the array constitutes a site defect where a localized electromagnetic mode can occur. While both monopole and dipole wake-fields have been studied, we confine our attention here mainly to the dipole case. The dipole wake-field is produced by modes in the propagation bands which tend to fill the entire cavity more or less uniformly and are thus easy to damp selectively. MAFIA time domain simulation of the transverse wake-field has been compared with that of a cylindrical pill-box comparison cavity. Even without damping the wake-field of the metal PBG cavity is substantially smaller than that of the pill-box cavity and may be further reduced by increasing the size of the lattice. By introducing lossy material at the periphery we have been able to produce Q factors for the dipole modes in the 40 to 120 range without significantly degrading the accelerating mode. {copyright} {ital 1997 American Institute of Physics.}

• Research Organization: Stanford Linear Accelerator Center
• DOE Contract Number: AC03-76SF00515; FG03-93ER40793
• OSTI ID: 587055
• Report Number(s): CONF-9610281--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 398; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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