Broad-band beam buncher

Patent · Wed Jan 01 04:00:00 EST 1986

OSTI ID:865752

Goldberg, David A ^[1]; Flood, William S ^[2]; Arthur, Allan A ^[3]; Voelker, Ferdinand ^[4]

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1. Walnut Creek, CA
2. Berkeley, CA
3. Martinez, CA
4. Orinda, CA

A broad-band beam buncher is disclosed, comprising an evacuated housing, an electron gun therein for producing an electron beam, a buncher cavity having entrance and exit openings through which the beam is directed, grids across such openings, a source providing a positive DC voltage between the cavity and the electron gun, a drift tube through which the electron beam travels in passing through such cavity, grids across the ends of such drift tube, gaps being provided between the drift tube grids and the entrance and exit grids, a modulator for supplying an ultrahigh frequency modulating signal to the drift tube for producing velocity modulation of the electrons in the beam, a drift space in the housing through which the velocity modulated electron beam travels and in which the beam is bunched, and a discharge opening from such drift tube and having a grid across such opening through which the bunched electron beam is discharged into an accelerator or the like. The buncher cavity and the drift tube may be arranged to constitute an extension of a coaxial transmission line which is employed to deliver the modulating signal from a signal source. The extended transmission line may be terminated in its characteristic impedance to afford a broad-band response and the device as a whole designed to effect broad-band beam coupling, so as to minimize variations of the output across the response band.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
• DOE Contract Number: AC03-76SF00098
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4567452
• OSTI ID: 865752
• Country of Publication: United States
• Language: English

Related Subjects

/315/313/
accelerator
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arranged
band
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beam buncher
beam coupling
beam travels
broad-band
broad-band beam
bunched
bunched electron
buncher
cavity
characteristic
characteristic impedance
coaxial
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drift
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electron
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entrance
evacuated
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extended
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frequency
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gaps
grid
grids
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housing
impedance
line
minimize
modulated
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modulating
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openings
output
passing
positive
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response
response band
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signal source
source
space
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transmission
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