| Paper |
Title |
Page |
| PM03 |
Studies of OTR Angular Distribution on CTF2
|
92 |
| |
- E. Bravin, T. Lefèvre
CERN, Geneva, Switzerland
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| |
Today, Optical Transition radiation (OTR) is widely used in beam
diagnostics. The most common application is the imaging of the transverse
and longitudinal beam profiles. Other beam parameters like divergence and
energy can also be deduced by observing the angular distribution of the
OTR emission (“Donuts”). In order to investigate the possibilities
and the limits offered by this technique we have performed a test on the
48 MeV, 1 nC electron beam of the CLIC Test Facility 2 (CTF2).
Beam divergences between 2 and 6 mrad were measured with an accuracy of
few percent. A good agreement was also found between the energy
measurements obtained with a classical spectrometer and the OTR based
technique. We conclude describing some possible future applications of
OTR based diagnostics for CLIC.
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| PM04 |
OTR from Non-Relativistic Electrons
|
95 |
| |
- C. Bal, E. Bravin, E. Chevallay, T. Lefèvre, G. Suberlucq
CERN, Geneva, Switzerland
|
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The CLIC Test Facility 3 (CTF3) injector will provide pulsed beams of
high average current; 5 A over 1.56 μs at 140 keV. For transverse beam sizes
of the order of 1mm, as foreseen, this implies serious damages to the
commonly used scintillating screens. Optical Transition Radiation from
thermal resistant radiators represents a possible alternative. At low
energy the OTR emission is feeble and distributed over a large solid
angle. In order to investigate the feasibility of such a diagnostic
studies have been carried out on a test 80 keV photo injector. The
experimental set-up is described and the results are compared to the
calculations based on the OTR emission theory. Our conclusions for the
design of the CTF3 injector profile monitor are also given.
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