First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
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DIRC: the PID Device<br />
Detector <strong>for</strong> Internally Reflected Cerenkov light.<br />
Quartz<br />
n 3<br />
t z<br />
n 2<br />
Detector<br />
Surface<br />
t y<br />
n 1<br />
y<br />
z<br />
n 3<br />
θ D<br />
Particle Trajectory<br />
z<br />
Side View<br />
◆ Measures the angle <strong>of</strong> Cerenkov light trapped inside quartz bars due<br />
to total internal reflection.<br />
◆ Light emitted at the end <strong>of</strong> the bar expands in purified water.<br />
◆ An array <strong>of</strong> small-diameter PMTs detects the light.<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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