Overview of Hardware R&D
description
Transcript of Overview of Hardware R&D
Overview of Hardware R&D
George LolosUniversity of ReginaGlueX Meeting, Glasgow, August 4,
2003
Outline
BCAL R&D Progress at ReginaRegina plans for 2004FSU MoUIU R&D
BCAL R&D Progress at Regina
2-m long, 17-cm thick module completedLight transmission testing under wayHPD/MCP+ circuits ongoingRay tracing code completeGEANT/ROOT progress (tomorrow)
Regina Grid Portal v.1.0 works (tomorrow)
2-m Module Gallery - 1
Now that’s a toilet paper roll!
2-m Module Gallery - 2
No we have no bananas.
2-m Module Gallery - 3
Hair salon? Combs nonetheless!
2-m Module Gallery - 4
All that glue for GlueX.
2-m Module Gallery - 5
Machined to perfection.
2-m Module Gallery - 6
… but on closer look:
2-m Module Gallery - 7
The Great White North
2-m Module Gallery - 8
The Canuck Crew.
Next Steps for Pb/SciFi
2-m testing with cosmics and beam (Hall B?)1-m prototype with Scint sheets (IU).4-m prototype construction at CSR/UofA MOU with UofA signed. 100-km fibers ordered, Pb and glue. Softer Pb being ordered from Vulcan 4.5-m press in design stage Spooling apparatus R&D Clean room facilities at UofA being setup Timetable: completion June 2004
HPD/MCP Electronics
HPDs Limitations in timing resolution New preamp/shaper from Cremat Collaboration with P. Smith (IU)
MCP and other devices (under study)Conventional PMTs?
Ray Tracing in Fibers
Objective: find light transmission, timing resolution Compare air vs. glue “cladding” ncore=1.59, ninner=1.49, nouter=1.42
Photons: random origin and directionGeometry and ElectrodynamicsCompare to reflection coefficientTally escaped s, calculate traversal time for others
Ray Tracing Results - 1Cladding index 1.49 in air (5000 rays)
0
5
10
15
20
25
0 5 10 15 20 25
Time (ns)
# o
f R
ays
Transmission: 58.1%
Ray Tracing Results - 2Cladding index 1.49 in glue (5000 rays)
0
5
10
15
20
25
30
35
0 5 10 15 20 25 30
Time (ns)
# o
f R
ays
Transmission: 12.1%
Ray Tracing Results - 3Cladding index 1.42 in air (5000 rays)
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25 30
Time (ns)
# o
f R
ays
Transmission: 57.0%
Ray Tracing Results - 4Cladding index 1.42 in glue (5000 rays)
0
5
10
15
20
25
30
0 5 10 15 20 25 30
Time (ns)
# o
f R
ays
Transmission: 21.3%
UPV – FSU MOUBack angle soft photon detection Use soft iron to recover uniform B-field Photons greater than 20 MeV Photon multiplicity capability Fast timing and trigger feeding
UPV 18 layers of 1-cm thick scintillator Each layer has 7 34cm x 238 cm paddles (x,u,v) Wavelength shifter, single PMT per paddle 12 layers of 0.635-cm Pb sheets 6 layers of 1.270-cm Pb sheets
Construct & Test Fe- and Pb-based module
Particle IDIU R&D
Particle IdentificationTOF tests inRussia - Serpukhov
Magnetic shielding studies
Cerenkovcounter
TOF Prototype
Magnetic ShieldingHelmholtz coils built by undergrads lastyear - upgraded this year new power supplies
Magnetic Shielding
Barrel Calorimeter
Dan Krop and IU will build a lead/scintillatorsheet calorimeter module and we will do a direct comparison with scifi/lead design to seeif a less expensive design is feasible.
Beam tests will be performed at IHEP
This work in conjunction with U of Regina
Barrel Calorimeter
Barrel Calorimeter
Straw-tubesWe have made 4 out of 16 endplate pieces, and checkedtheir accuracy.
We have purchased 250 1.6 cm diameter straw tubes.
We are getting glue samples.
We are prototyping feed throughs
We are carrying out gas studies using Garfield.
Straw-tubes from Euclid
10000 rpm 10 mil saw to cut the tubes
250 tubes arrived in 1 week at50 cents each. (High reject rate.)
Sample Tubes
Straw-tube Chamber Status
The four prototype endplates set up with some straws inserted. TheGoal is to put a few hundred tubes in, and then instrument 10s ofChannels.
Feed Through’s
Hand making each one.
Items under study
Conductive epoxies for the straws, looking at both conductivity and gas tightness.
Radiation hardness of materials.
Gas mixtures for the chamber.
Construction techniques.
Network Bandwidth StudiesWe have carried out a number of tests to see the data ratesAt which we are able to move large amounts of data fromJLab to CMU. Currently can get ~70Mbits/second!
JLab
PSCCMU
ESNET
OC3 (155Mbit/s)
Internet 2OC48 (2480Mbit/s)
GigaBit
RAID
100Mbit
Will move to OC12 (620Mbit/s)
bottleneck
bottleneck
Move to GigaBit
We can move 1GigaByte of data in ~115 seconds. We can cut this by 2-3 with upgrades.