A "proof-of-principle" experiment on the optical diffraction radiation (ODR
) as a single-pulse beam profile monitor is planned using an electron beam
extracted from the KEK-ATF damping ring. The main goals of this experiment
are the following:
(i) To measure the yield and the angular distributions of the optical diffr
action radiation from a large-size target at different wavelengths, impact
parameters and beam characteristics for a comparison with analogous charact
eristics of optical transition radiation from a foil with identical optical
parameters and for a verification of the model assumption (perfectly condu
cting semi-infinite target).
(ii) To investigate the ODR angular distributions from a tilted target with
a slit for observing the interference effects.
(iii) To compare the results obtained by simulations based on classical app
roaches, taking into account the optical characteristics of the equipment a
nd the beam parameters.
(iv) To estimate the prospects of using ODR as a new non-invasive tool for
We estimated that the ODR photon yield in 10% bandwidth for 500 nm is about
10(6) photons/bunch with an impact parameter of 100 pm. This indicates tha
t the ODR monitor is a promising candidate for single-pulse beam-profile me
asurements, and that it will be an extremely useful instrument for future l
inear colliders (JLC, NLC, TESLA and CLIC). (C) 2001 Elsevier Science B.V.
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