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Beam profiles are acquired in transfer lines to monitor extracted beams
and compute their emittance. Measurements performed on the first
revolutions of a ring will evaluate the matching of a chain of
accelerators. Depending on the particle type and energy, these
measurements are in general performed with screens, making either use of
Luminescence or OTR [Optical Transition Radiation], and the generated
beam images are acquired with detectors of various types: CCD, CMOS, CID,
TV Tubes or Multi-Anode Photo-Multipliers. The principles, advantages and
disadvantages of both families of screens will be discussed in relation
with the detectors used. A possible evaluation method for luminescent
screens and beam test results will be presented. Finally other optical
methods used will be mentioned for completeness.
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