Orateur
Dr
Jochen Schwiening
(GSI Helmholtzzentrum für Schwerionenforschung GmbH)
Description
Cooled antiproton beams of unprecedented intensities in the momentum
range of 1.5-15 GeV/c will be used at the PANDA experiment at FAIR to
perform QCD studies including searches for exotic states and high precision
experiments in the charmed quark sector.
Charged particle identification in the barrel region needs a thin detector
operating in a strong magnetic field. Both requirements can be met by a
Ring Imaging Cherenkov detector using the DIRC principle. Combining the
time of arrival of the photons with their spatial image determines not only
the particles velocity, but also the wavelength of the photons. Therefore,
dispersion correction at the lower and upper detection threshold becomes
possible.
Long, rectangular bars made from synthetic fused silica are used as Cherenkov
radiator and light guide. The optical properties, such as bulk transmission and
surface reflectivity, are of critical importance to the DIRC performance. We
developed a motion-controlled system using lasers wavelength from 266nm
to 635nm to measure the coefficient of total internal reflection which can be
used to determine the quality of the surface polish with a precision of a few
Angstrom.
We present details of the design of a prototype for the Barrel DIRC detector
of the PANDA experiment at FAIR and its performance in a proton test beam
as well as measurements of the optical properties of prototype bars.
| Please indicate "poster" or "plenary" session. Final decision will be made by session coordinators. | poster |
|---|
Auteur principal
Dr
Jochen Schwiening
(GSI Helmholtzzentrum für Schwerionenforschung GmbH)
