SCINTILLATOR HARDWARE

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SCINTILLATOR HARDWARE DEWELOPMENT AND
PLANS Short term LCDmu RD project for NIU
Alexandre Dyshkant, Kurt Francis for
NICADD Northern Illinois University (DeKalb, IL
60115)
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Comparative measurements of light output
between long strip made from cast and extruded
scintillator using WLS and clear fibers as
readout.
GOAL
NOTE
One general goal is that the test bench and
hardware development be efficient and useful at
the same time for both NIU scintillator-based
projects, which are muons and digital hadron
calorimeter.
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DESCRIPTION OF TEST SETUP
Scintillating strips(details below), WLS fibers
embedded into a groove. Optical connectors at
strip ends, leading to clear fibers one photo
detector at each end.
1st step PMT output connected to picoAmmeter
Keithley 6485 2nd step PMT output connected to
ADC in VME crate Software LabView
Measurements are to be performed with
-radioactive source Sr-90, -cosmic rays (top
bottom scintillator as a trigger
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HARDWARE ALREADY IN PLACE
Scintillating strips Two KURARAY SCSN81 (cast
scintillator) 0.93 x 4.73 x 224 cm³ - call it
narrow 0.93 x 9.81 x 224 cm³ - call it
wide (The plan is to place a single groove on
the narrow and a Double groove on the wide
strip). Two MINOS strips (extruded
scintillator) 1.0 x 4.1 x 244 cm³ - these are
coated and grooved
WLS fibers BCF92 (round 1.0 mm outer diameter).
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Narrow strip with one carved groove .
Wide strip with two carved grooves.
WLS fiber
Optical connectors
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SCINTILLATING STRIPS WITH GLUED WLS FIBERS
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PMTs
One Hamamatsu PMT R580-17 (single channel) One
Hamamatsu PMT H6568 (sixteen channels)
DAQ
VME crate with a 32 channels QDC PC and some
software under development
Light source
Sr-90 (NICADD procuring , with safe and
servomiter)
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FIRST STEP OF HARDWARE DEVELOPMENT
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Hardware we need in a relatively short term
Clear fibers and protective tubes if fibers are
not light tight. WLS fibers (other than the
BCF92 round 1 mm outer diameter) need for
comparison. PMTs (need at both ends of optical
fibers, plus cosmic triggers) Two extra
Hamamatsu PMT R580-17 (single-channel) H6568
(16-channel) H7546 (64-channel)
2 APDs
(32-channel) The most critical missing
component is the clear fiber.
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NIU PLANS

• Comparison of brightness of extruded and cast
  scintillating strips.
• Comparison of response of few thin WLS embedded
  fibers with one thick WLS fiber embedded in the
  same scintillating strip.
• Comparison of uniformity response across and
  along the extruded and cast strip.
• Comparison of response among different WLS fibers
  for the same scintillating strip and groove.
• Comparison of response for extruded and machined
  groove for the same strip.
• Measurement of responses for different thickness
  of scintillating strips using the same WLS fiber.