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| IT09 |
Smith-Purcell Radiation in View of Particle Beam Diagnostics
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- G. Kube
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- H. Backe, W. Lauth, H. Schöpe
IKP, Institut für Kernphysik, Mainz, Germany
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The development of the next generation high quality electron beams which
are necessary for future high luminosity linear colliders and short
wavelengths free electron lasers requires sensitive and non-destructive
beam diagnostic techniques. In this context Smith-Purcell radiation
which is generated when a charged particle beam passes close to the
surface of a periodic structure (diffraction grating) is under discussion
as a compact and inexpensive beam profile monitor.
In order to study the basic emission process of Smith-Purcell radiation
also in view of possible applications for particle beam diagnostics,
experimental studies were performed at the Mainz Microtron MAMI in the
visible spectral region with a microfocused 855 MeV electron beam. The
radiation was separated from background components, as diffracted
synchrotron radiation and transition radiation generated by electrons
scratching the grating surface, by exploiting their specific emission
characteristics. These are
- the narrow emission cone in the direction perpendicular to the
grating surface,
- the dispersion relation |n| λ = D (1 / β - cos θ)
with n the diffraction order, β the reduced electron
velocity, and θ the angle of observation, and
- the charcteristic intensity scaling as a function of the distance
between beam axis and grating surface.
Based on the experimental results the use of Smith-Purcell radiation as
a longitudinal and transversal beam profile monitor will be discussed.
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