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}
}