sparro group, university of regina 1 barrel calorimeter status quo zisis papandreou university of...
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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
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
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
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
SPARRO Group, University of Regina5
2-m Gluing & Pressing Process
All that glue for GlueX.
SPARRO Group, University of Regina6
Trickery rewards
Vaseline to the rescue
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1m Mod
2m Mod
The “Ruler” Test
… but on closer look:
… oops
SPARRO Group, University of Regina8
When you least expect it…
…Big Brother is watching!
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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Pure Leadnow…
Now that’s a toilet paper roll!
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BananaProblemis solved…
Yes we have no bananas.
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Lead Cutter
- 2m prototype- 4m next- multiple track
SPARRO Group, University of Regina13
Spooling R&D
Hair salon? Combs nonetheless!
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Cosmic Tests (Vitaly Kovaltchouk)
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ADC Spectra
PRELIMIN
ARY
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TDC Spectra
PRELIMIN
ARY
550 ps 670 ps
polished unpolished
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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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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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Compact but expensive
2001
SPARRO Group, University of Regina20
Pre-amp and board
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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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MCA Spectrum (LED)
LED onLED off
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241Am Spectrum
Vitaly Kovaltchouk
13% energyresolution
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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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HPD vs. PMT
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SiPM vs. PMT
OptitronXe-N Plasma
DischargeTube
1900 V
4ns risetime 55 V
1ns risetime; 300 mV
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Timing resolution
140 ps 375 ps
SiPM PMT
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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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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)
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