Emittance measurement in a magnetic field

Emittance can be measured by intercepting an electron beam on a range thick plate and then observing the expansion of beamlets transmitted through small holes. The hole size is selected to minimize space charge effects. In the presence of a magnetic field the beamlets have a spiral trajectory and th...

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Bibliographic Details
Main Author: Boyd, J.K.
Format: Conference Proceeding
Language:English
Subjects:
Contracts
Cyclotrons
Equations
Frequency
Laboratories
Magnetic analysis
Magnetic field measurement
Space charge
Spirals
Thickness measurement
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Summary:Emittance can be measured by intercepting an electron beam on a range thick plate and then observing the expansion of beamlets transmitted through small holes. The hole size is selected to minimize space charge effects. In the presence of a magnetic field the beamlets have a spiral trajectory and the usual field free formulation must be modified. To interpret emittance in the presence of a magnetic field an envelope equation is derived in the appropriate rotating frame.< >
DOI:10.1109/PAC.1991.164326