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Shapiro, M. A.

Paper Title Page
THPMS005 Observation of Wakefields in a 17 GHz Metallic Photonic Bandgap (PBG) Structure 3002
 
  • R. A. Marsh, M. A. Shapiro, R. J. Temkin
    MIT/PSFC, Cambridge, Massachusetts
  • E. I. Smirnova
    LANL, Los Alamos, New Mexico
 
  Funding: Work supported by the Department of Energy, High Energy Physics, under contract DE-FG02-91ER40648.

Results are reported on experimental wakefield measurements made on a 6 cell, 17 GHz metallic PBG accelerator structure. Wakefields were observed using a variety of detectors and methods. The PBG structure is open, containing no outer wall, and radiation has been observed through a window in the surrounding vacuum vessel. The input and output ports have also been used with windows to observe radiation coupling out of the ports. Estimations of radiation are made using HFSS and an EFIE code. Measurements have been made using video diode detectors, wavemeters, heterodyne receivers, and a bolometer. Plans are discussed for future experiments with injected power and longer structures.

 
THPMS006 Photonic Bandgap (PBG) Accelerator Structure Design 3005
 
  • R. A. Marsh, M. A. Shapiro, R. J. Temkin
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Work supported by the Department of Energy, High Energy Physics, under contract DE-FG02-91ER40648.

High gradient structure design entails optimization of the gradient, while minimizing surface electric fields (associated with breakdown) and surface magnetic fields (associated with pulsed heating). Design studies are reported comparing metallic and dielectric PBG structures and standard disk-loaded waveguide. Operation in a higher order mode is considered. A variety of codes; HFSS, CST MWS, and Superfish have been used to compare and refine designs. Final design work is in preparation for a structure to be cold tested, tuned, and then processed to high gradient operation at the MIT HRC 17 GHz accelerator facility.

 
THPMS007 Surface Waves on Interface of 3D Metal-wire Diamond Lattice for Accelerator Applications. 3008
 
  • M. A. Shapiro, J. R. Sirigiri, R. J. Temkin
    MIT/PSFC, Cambridge, Massachusetts
 
  Funding: Dept. of Energy, High Energy Physics

We present the results of our recent research on 3D metal-wire lattices operating at microwave frequencies, with applications to advanced accelerator structures and radiation sources based on the Smith-Purcell effect. Bulk and surface electromagnetic waves supported by a diamond-like lattice are calculated using HFSS. The bulk modes are determined using primitive cell calculations. The surface mode is determined using the simulations of the stack of cells with the perfect-matching layer (PML) boundary.