Barrel Calorimeter Status Quo Zisis Papandreou University of
Barrel Calorimeter Status Quo Zisis Papandreou University of Regina Glue. X Collaboration Meeting JLab, December 11 -13, 2003 SPARRO Group, University of Regina 1
Outline n BCAL Module Prototyping n n n 2 -m Module-0 Construction & Tests 4 -m Module-1 Preparations BCAL Readout R&D n n HPD Review Si. PM Test Results SPARRO Group, University of Regina 2
2 -m Module-0 n n Great crew of undergraduates Construction Completed n n 200 cm (l) x 13 cm (w) x 17 cm (t) 180 kg Polishing Completed Preliminary Tests with Cosmics SPARRO Group, University of Regina 3
Module-0 “The Matrix” n n 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 Regina 4
2 -m Gluing & Pressing Process All that glue for Glue. X. SPARRO Group, University of Regina 5
Trickery rewards Vaseline to the rescue SPARRO Group, University of Regina 6
The “Ruler” Test … oops 1 m Mod … but on closer look: 2 m Mod SPARRO Group, University of Regina 7
When you least expect it… …Big Brother is watching! SPARRO Group, University of Regina 8
Matrix Reloaded n n n 2 -m testing with cosmics and beam (Serpukov/Hall B? ) 1 -m prototype with Scintillator sheets (IU). 4 -m prototype construction at CSR/Uof. A n n n MOU with Uof. A signed. Softer Pb received (Vulcan), Epoxy (Bicron) 100 -km fibers arrived; snag in shipment 4. 5 -m press, Cutting, Spooling Design Preparations at Uof. A are underway for 4 m work Timetable: completion August 2004? SPARRO Group, University of Regina 9
Pure Lead now… Now that’s a toilet paper roll! SPARRO Group, University of Regina 10
Banana Problem is solved… Yes we have no bananas. SPARRO Group, University of Regina 11
Lead Cutter - 2 m prototype - 4 m next - multiple track SPARRO Group, University of Regina 12
Spooling R&D Hair salon? Combs nonetheless! SPARRO Group, University of Regina 13
Cosmic Tests SPARRO Group, University of Regina (Vitaly Kovaltchouk) 14
ADC Spectra PREL SPARRO Group, University of Regina Y R A N IMI 15
TDC Spectra polished unpolished 550 ps PREL SPARRO Group, University of Regina 670 ps Y R A N IMI 16
And what about the readout? n n n 2 Tesla field; field gradient Compact design; cost considerations Technology: n n Hybrid Photo Diode – Review Silicon Photo Multiplier – New Tests Multi Channel Plates? Avalanche Photo Diodes? SPARRO Group, University of Regina 17
HPD Measurements (Vitaly Kovaltchouk, Keith Wolbaum, Garth Huber) n n n HPD gain is 1600; preamp, amp-shaper needed Noise: Setup is sensitive but under control Light sources: n n n Xe-N flasher: its RF interfers; requires shielding Na. I crystal and 241 Am, 137 Cs and 60 Co sources LED (pulsed): neutral density filter, fiber lightguide Measurements: HPD PP 0350 G with Multi-Channel Analyzer (Tektronix 5200) Bottom line: system works, rise time poor, energy resolution modest, components are expensive SPARRO Group, University of Regina 18
Compact but expensive 2001 SPARRO Group, University of Regina 19
Pre-amp and board SPARRO Group, University of Regina 20
Rise Time vs. External Capacitor Light Source: Nanosecond Broad-Spectrum Optical Pulse Radiator (Model NR-1 A) and Laser Pulse Simulator (Model LPS-1 A), HV 20 k. V. HPMT: A 25 mm proximity focused single pixel Hybrid Photo Diode equipped, with an S 20 UV photo-cathode on a quartz input window, HV 8 k. V, Bias 75 V. Silicon diode capacitance 200 p. F. Tube Type DEP 350 G Burle 8875 Cexternal (p. F) Rise Time (ns) Amplitude (m. V) MCA Channel Noise (m. V) 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 0 <10 8000 - ~2 SPARRO Group, University of Regina 21
MCA Spectrum (LED) LED off SPARRO Group, University of Regina LED on 22
241 Am Spectrum 13% energy resolution Vitaly Kovaltchouk SPARRO Group, University of Regina 23
Si. PM: a new Sheriff in town n Multi pixel silicon photo diode Micro pixels (20 -30 m) on common load 500 pixels in 1 mm 2 area Operates in Geiger mode; 106 gain n Provided by Moscow Engineering and Physics Institute n n n SPARRO Group, University of Regina 24
HPD vs. PMT SPARRO Group, University of Regina 25
Si. PM vs. PMT 1900 V Optitron Xe-N Plasma Discharge Tube 55 V 4 ns risetime 1 ns risetime; 300 m. V SPARRO Group, University of Regina 26
Timing resolution Si. PM PMT 140 ps SPARRO Group, University of Regina 375 ps 27
Energy resolution Xe-N + Lecroy 612 A 90 Sr on Scintillating Fiber 1 pe Low light 2 pe Scint Light signal 3 pe noise SPARRO Group, University of Regina 28
Si. PM in a nutshell n n Very promising readout for BCAL Better timing and energy resolution than standard 2” PMTs $50 prototypes, $1 for bulk orders? Tests to come: n n 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 Regina 29
So, where are we? n Matrix construction is well in hand n n Readout type may have been found n n 2 -m test cosmic results available soon 4 -m will have modest R&D obstacles Construction site (Uof. R, Uof. A…) Si. PM very suitable (MCP, APD? ) Frame and integration issues outstanding SPARRO Group, University of Regina 30
- Slides: 30