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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
</font></b></font><font color="#3333ff"><b>March 28, 2012<br>
11:00 AM<br>
F113<br>
Cookies and Coffee 10:45AM<br>
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<b><font color="#cc0000">Jochen Schwiening
<br>
GSI Darmstadt, Germany
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<b><font color="#3333ff">"DIRC Detectors: from BaBar to PANDA and
Beyond"
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Particle identification (PID) is a key requirement for many modern
high-energy physics experiments. Ring Imaging Cherenkov (RICH)
detectors are capable of providing excellent hadronic PID for a wide
range of particle momenta. A DIRC (Detection [of] Internally Reflected
Cherenkov [light]) is a distinctive, compact RICH subtype first used in
the BaBar detector. It uses flat, rectangular cross section Cherenkov
radiators made from a solid material, typically fused silica, to
generate Cherenkov light and transport it by total internal reflection
to the photon detectors. The successful operation of the BaBar DIRC
from 1999-2008, which achieved pi/K separation of 2.5 standard
deviations or more up the 4 GeV/c momentum with high efficiency and
purity, motivated a number of R&D efforts to further improve on the
BaBar DIRC design and extend the DIRC range to higher momenta. After an
introduction to the basic principles of DIRC detectors I will discuss
the experience with the BaBar DIRC and review the design of the DIRC
counters at the Belle II, SuperB, and PANDA experiments as well as
R&D ideas for DIRC systems at future experiments such as the EIC
central detector.
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