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Title: W-Band Sheet Beam Klystron Simulation

Abstract

With the development of ever higher energy particle accelerators comes the need for compactness and high gradient, which in turn require very high frequency high power rf sources. Recent development work in W-band accelerating techniques has spurred the development of a high-power W-band source. Axisymmetric sources suffer from fundamental power output limitations (P{sub sat} {approx} {lambda}{sup 2}) brought on by the conflicting requirements of small beam sizes and high beam current. The sheet beam klystron allows for an increase in beam current without substantial increase in the beam current density, allowing for reduced cathode current densities and focusing field strengths. Initial simulations of a 20:1 aspect ratio sheet beam/cavity interaction using the 3 dimensional particle-in-cell code Magic3D have demonstrated a 35% beam-power to RF power extraction efficiency. Calculational work and numerical simulations leading to a prototype W-band sheet beam klystron will be presented, together with preliminary cold test structure studies of a proposed RF cavity geometry.

Authors:
; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
878444
Report Number(s):
SLAC-PUB-11471
TRN: US0602385
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for Conference on High-Energy Density Microwaves, Pajaro Dunes, California, 5-8 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; ASPECT RATIO; BEAM CURRENTS; CATHODES; EFFICIENCY; FOCUSING; GEOMETRY; KLYSTRONS; MHZ RANGE; SIMULATION; ACCSYS

Citation Formats

Colby, E R, Caryotakis, G, Fowkes, W R, /SLAC, Smithe, D N, and /Mission Res., Newington. W-Band Sheet Beam Klystron Simulation. United States: N. p., 2005. Web.
Colby, E R, Caryotakis, G, Fowkes, W R, /SLAC, Smithe, D N, & /Mission Res., Newington. W-Band Sheet Beam Klystron Simulation. United States.
Colby, E R, Caryotakis, G, Fowkes, W R, /SLAC, Smithe, D N, and /Mission Res., Newington. Mon . "W-Band Sheet Beam Klystron Simulation". United States. https://www.osti.gov/servlets/purl/878444.
@article{osti_878444,
title = {W-Band Sheet Beam Klystron Simulation},
author = {Colby, E R and Caryotakis, G and Fowkes, W R and /SLAC and Smithe, D N and /Mission Res., Newington},
abstractNote = {With the development of ever higher energy particle accelerators comes the need for compactness and high gradient, which in turn require very high frequency high power rf sources. Recent development work in W-band accelerating techniques has spurred the development of a high-power W-band source. Axisymmetric sources suffer from fundamental power output limitations (P{sub sat} {approx} {lambda}{sup 2}) brought on by the conflicting requirements of small beam sizes and high beam current. The sheet beam klystron allows for an increase in beam current without substantial increase in the beam current density, allowing for reduced cathode current densities and focusing field strengths. Initial simulations of a 20:1 aspect ratio sheet beam/cavity interaction using the 3 dimensional particle-in-cell code Magic3D have demonstrated a 35% beam-power to RF power extraction efficiency. Calculational work and numerical simulations leading to a prototype W-band sheet beam klystron will be presented, together with preliminary cold test structure studies of a proposed RF cavity geometry.},
doi = {},
url = {https://www.osti.gov/biblio/878444}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {9}
}

Conference:
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