SPARRO Group, University of Regina 1 Barrel Calorimeter Status Quo Zisis Papandreou University of Regina GlueX Collaboration Meeting JLab, December 11-13, 2003

SPARRO Group, University of Regina 2 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 Regina 3 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 Regina 4 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 Regina 5 2-m Gluing & Pressing Process All that glue for GlueX.

SPARRO Group, University of Regina 6 Trickery rewards Vaseline to the rescue

SPARRO Group, University of Regina 7 1m Mod 2m Mod The “Ruler” Test … but on closer look: … oops

SPARRO Group, University of Regina 8 When you least expect it… …Big Brother is watching!

SPARRO Group, University of Regina 9 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?

SPARRO Group, University of Regina 10 Pure Lead now… Now that’s a toilet paper roll!

SPARRO Group, University of Regina 11 Banana Problem is solved… Yes we have no bananas.

SPARRO Group, University of Regina 12 Lead Cutter - 2m prototype - 4m next - multiple track

SPARRO Group, University of Regina 13 Spooling R&D Hair salon? Combs nonetheless!

SPARRO Group, University of Regina 14 Cosmic Tests (Vitaly Kovaltchouk)

SPARRO Group, University of Regina 15 ADC Spectra PRELIMINARY

SPARRO Group, University of Regina 16 TDC Spectra PRELIMINARY  550 ps  670 ps polishedunpolished

SPARRO Group, University of Regina 17 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?

SPARRO Group, University of Regina 18 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 241 Am, 137 Cs and 60 Co 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

SPARRO Group, University of Regina 19 Compact but expensive 2001

SPARRO Group, University of Regina 20 Pre-amp and board

SPARRO Group, University of Regina 21 Rise Time vs. External Capacitor Tube TypeC external (pF)Rise Time (ns) Amplitude (mV) MCA Channel Noise (mV) DEP 350G ~ ~ ~ ~ ~ ~3 Burle 88750< ~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.

SPARRO Group, University of Regina 22 MCA Spectrum (LED) LED on LED off

SPARRO Group, University of Regina Am Spectrum Vitaly Kovaltchouk 13% energy resolution

SPARRO Group, University of Regina 24 SiPM: a new Sheriff in town Multi pixel silicon photo diode Micro pixels (20-30  m) on common load 500 pixels in 1mm 2 area Operates in Geiger mode; 10 6 gain Provided by Moscow Engineering and Physics Institute

SPARRO Group, University of Regina 25 HPD vs. PMT

SPARRO Group, University of Regina 26 SiPM vs. PMT Optitron Xe-N Plasma Discharge Tube 1900 V 4ns risetime 55 V 1ns risetime; 300 mV

SPARRO Group, University of Regina 27 Timing resolution 140 ps375 ps SiPMPMT

SPARRO Group, University of Regina 28 Energy resolution Low lightScint Light Xe-N + Lecroy 612A 90 Sr on Scintillating Fiber 1 pe 2 pe 3 pe noise signal

SPARRO Group, University of Regina 29 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 Regina 30 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