1. SCINTILLATOR HARDWARE
DEWELOPMENT AND PLANS
Short term LCDmu R&D project for NIU
Alexandre Dyshkant, Kurt Francis
for NICADD
Northern Illinois University (DeKalb, IL 60115)
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

2. GOAL NOTE: 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.
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

3. Alexandre Dychkant / Arlington LC Workshop
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
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

4. Alexandre Dychkant / Arlington LC Workshop
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).
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

5. Alexandre Dychkant / Arlington LC Workshop
Narrow strip with one
carved groove .
Wide strip with two
carved grooves.
WLS fiber
Optical connectors
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

6. Alexandre Dychkant / Arlington LC Workshop
SCINTILLATING STRIPS WITH GLUED WLS FIBERS
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

7. Alexandre Dychkant / Arlington LC Workshop
PMTs
One Hamamatsu PMT R (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)
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

8. Alexandre Dychkant / Arlington LC Workshop
FIRST STEP OF HARDWARE DEVELOPMENT
PicoAmmeter
LabView
Photo detectors
Clear fibers
Optical connectors
Light tight box
with strip and WLS fiber
Sr-90
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

9. Alexandre Dychkant / Arlington LC Workshop
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 R (single-channel)
H6568 (16-channel)
H7546 (64-channel)
2 APDs (32-channel)
The most critical missing component is the clear fiber.
11/13/2018
Alexandre Dychkant / Arlington LC Workshop

10. Alexandre Dychkant / Arlington LC Workshop
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.
11/13/2018
Alexandre Dychkant / Arlington LC Workshop