[Halld-pid] sketch of unbent light guide

[Beni Zihlmann]

Hi All,
attached is a sketch of a fishtail type light guide before bending.
the length is 20cm the cross section at the interface to the scintillator
is 6cm x 2.5cm the round end on the other side has 5cm diameter which
is the diameter of the PMT entrance window. And the length of the round
part is 7 cm. The tapering begins after 2cm from the interface to the
scintillator.
any comments on this?

cheers,
Beni
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