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

SPARRO Group, University of Regina7

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?

SPARRO Group, University of Regina10

Pure Leadnow…

Now that’s a toilet paper roll!

SPARRO Group, University of Regina11

BananaProblemis solved…

Yes we have no bananas.

SPARRO Group, University of Regina12

Lead Cutter

- 2m prototype- 4m next- multiple track

SPARRO Group, University of Regina13

Spooling R&D

Hair salon? Combs nonetheless!

SPARRO Group, University of Regina14

Cosmic Tests (Vitaly Kovaltchouk)

SPARRO Group, University of Regina15

ADC Spectra

PRELIMIN

ARY

SPARRO Group, University of Regina16

TDC Spectra

PRELIMIN

ARY

550 ps 670 ps

polished unpolished

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?

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

SPARRO Group, University of Regina19

Compact but expensive

2001

SPARRO Group, University of Regina20

Pre-amp and board

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.

SPARRO Group, University of Regina22

MCA Spectrum (LED)

LED onLED off

SPARRO Group, University of Regina23

241Am Spectrum

Vitaly Kovaltchouk

13% energyresolution

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

SPARRO Group, University of Regina25

HPD vs. PMT

SPARRO Group, University of Regina26

SiPM vs. PMT

OptitronXe-N Plasma

DischargeTube

1900 V

4ns risetime 55 V

1ns risetime; 300 mV

SPARRO Group, University of Regina27

Timing resolution

140 ps 375 ps

SiPM PMT

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

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)

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