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SPARRO Group, University of Regina 1
Barrel Calorimeter Status Quo
Zisis PapandreouUniversity of Regina
GlueX Collaboration MeetingJLab, December 11-13, 2003
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SPARRO Group, University of Regina2
Outline BCAL Module Prototyping
2-m Module-0 Construction & Tests 4-m Module-1 Preparations
BCAL Readout R&D HPD Review SiPM Test Results
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SPARRO Group, University of Regina3
2-m Module-0 Great crew of undergraduates Construction Completed
200cm (l) x 13cm (w) x 17cm (t) 180kg
Polishing Completed Preliminary Tests with Cosmics
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SPARRO Group, University of Regina4
Module-0 “The Matrix”
Construction method Tricks, Do’s and don’t’s Method is under control Minor R&D required for 4-m Module-1
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SPARRO Group, University of Regina5
2-m Gluing & Pressing Process
All that glue for GlueX.
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SPARRO Group, University of Regina6
Trickery rewards
Vaseline to the rescue
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SPARRO Group, University of Regina7
1m Mod
2m Mod
The “Ruler” Test
… but on closer look:
… oops
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SPARRO Group, University of Regina8
When you least expect it…
…Big Brother is watching!
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SPARRO Group, University of Regina9
Matrix Reloaded
2-m testing with cosmics and beam (Serpukov/Hall B?)
1-m prototype with Scintillator sheets (IU). 4-m prototype construction at CSR/UofA
MOU with UofA signed. Softer Pb received (Vulcan), Epoxy (Bicron) 100-km fibers arrived; snag in shipment 4.5-m press, Cutting, Spooling Design Preparations at UofA are underway for 4m work Timetable: completion August 2004?
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SPARRO Group, University of Regina10
Pure Leadnow…
Now that’s a toilet paper roll!
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SPARRO Group, University of Regina11
BananaProblemis solved…
Yes we have no bananas.
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SPARRO Group, University of Regina12
Lead Cutter
- 2m prototype- 4m next- multiple track
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SPARRO Group, University of Regina13
Spooling R&D
Hair salon? Combs nonetheless!
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SPARRO Group, University of Regina14
Cosmic Tests (Vitaly Kovaltchouk)
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SPARRO Group, University of Regina15
ADC Spectra
PRELIMIN
ARY
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SPARRO Group, University of Regina16
TDC Spectra
PRELIMIN
ARY
550 ps 670 ps
polished unpolished
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SPARRO Group, University of Regina17
And what about the readout?
2 Tesla field; field gradient Compact design; cost considerations Technology:
Hybrid Photo Diode – Review Silicon Photo Multiplier – New Tests Multi Channel Plates? Avalanche Photo Diodes?
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SPARRO Group, University of Regina18
HPD Measurements (Vitaly Kovaltchouk, Keith Wolbaum, Garth Huber)
HPD gain is 1600; preamp, amp-shaper needed Noise: Setup is sensitive but under control Light sources:
Xe-N flasher: its RF interfers; requires shielding NaI crystal and 241Am, 137Cs and 60Co sources LED (pulsed): neutral density filter, fiber lightguide
Measurements: HPD PP0350G with Multi-Channel Analyzer (Tektronix 5200)
Bottom line: system works, rise time poor, energy resolution modest, components are expensive
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SPARRO Group, University of Regina19
Compact but expensive
2001
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SPARRO Group, University of Regina20
Pre-amp and board
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SPARRO Group, University of Regina21
Rise Time vs. External Capacitor
Tube Type Cexternal (pF) Rise Time (ns)
Amplitude (mV)
MCA Channel
Noise (mV)
DEP 350G 22000 150 1300 950 ~3
10000 150 1400 1100 ~3
200 100 600 500 ~3
100 55 400 310 ~3
50 40 250 210 ~3
25 35 120 100 ~3
Burle 8875 0 <10 8000 - ~2
Light Source: Nanosecond Broad-Spectrum Optical Pulse Radiator (Model NR-1A) and Laser Pulse Simulator (Model LPS-1A), HV 20 kV.
HPMT: A 25 mm proximity focused single pixel Hybrid Photo Diode equipped, with an S20UV photo-cathode on a quartz input window, HV 8 kV, Bias 75 V. Silicon diode capacitance 200 pF.
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SPARRO Group, University of Regina22
MCA Spectrum (LED)
LED onLED off
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SPARRO Group, University of Regina23
241Am Spectrum
Vitaly Kovaltchouk
13% energyresolution
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SPARRO Group, University of Regina24
SiPM: a new Sheriff in town
Multi pixel silicon photo diode Micro pixels (20-30m) on common load 500 pixels in 1mm2 area Operates in Geiger mode; 106 gain Provided by Moscow Engineering and Physics Institute
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SPARRO Group, University of Regina25
HPD vs. PMT
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SPARRO Group, University of Regina26
SiPM vs. PMT
OptitronXe-N Plasma
DischargeTube
1900 V
4ns risetime 55 V
1ns risetime; 300 mV
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SPARRO Group, University of Regina27
Timing resolution
140 ps 375 ps
SiPM PMT
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SPARRO Group, University of Regina28
Energy resolution
Low light Scint Light
Xe-N + Lecroy 612A 90Sr on Scintillating Fiber
1 pe
2 pe
3 pe
noise
signal
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SPARRO Group, University of Regina29
SiPM in a nutshell Very promising readout for BCAL Better timing and energy resolution than standard
2” PMTs $50 prototypes, $1 for bulk orders? Tests to come:
Couple to Module-0 and measure Test in high magnetic field (MRI?) Radiation hardness Geometrical packing (Winston cones, wavelength
shifters funnel light down)
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SPARRO Group, University of Regina30
So, where are we?
Matrix construction is well in hand 2-m test cosmic results available soon 4-m will have modest R&D obstacles Construction site (UofR, UofA…)
Readout type may have been found SiPM very suitable (MCP, APD?)
Frame and integration issues outstanding