HCAL-J Update (G.B. Franklin, CMU, Mar. 2015)

• 40 Ton Detector • 288 modules • Arranged in 4 sub-assemblies

24 M

odul

es (3

60 c

m)

12 Modules (180 cm)

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Absorbers Scintillators

Wavelength Shifter

PMT

Rectangular to cylindricalLight Guide

Today’s Talk1) New Cosmic-Ray Timing Tests (Proto4)2) New light-guide details3) December engineering review4) Status of production

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1) Cosmic Ray Timing MeasurementsFirst: A Brief Historical Note

Proto2 results shown at the Nov. DOE Review showed 340 ps timing resolution (cosmics)Predicted TOF better than 300 ps rms with improved light guides

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Proto4 Cosmic Tests(Proto3 assembled and sent to JLab for Hall A tests)

Improved light guideMore than x2 photoelectrons

277 ps rms time resolution(after start-time resolution correction)

Vahe Mamyan’s measurements show we have exceeded our expected time resolution for cosmics

400 photo-electrons at peak

Integrated Raw FADC Units Time – Start Time (nsec)

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Updated Monte Carlo Results

Vahe used Proto4 results to tune Monte Carlo

Result: 0.7 ns rms time resolution for 4.8 GeV/c neutrons(No change for 2.7 or 8.8 GeV/c simulations)

Simulated HCAL-J timing resolution for 4.8 GeV/c neutrons

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2) Light Guide DetailsBracket and Optical Fiber Guide TubeMounting Holes Guide Tube Hole

Gluing Holes

Fishing Line Anchors

Laser-cut Acrylic Light Guide Bracket

Bracket Solvent-Welded to Cylinder

Bracket Bolted to End Cap

Guide Tube

Proto4 Back End Cap Detail

Guide Tube

Light Guide

AluminizedMylar

Bracket

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3) December Engineering Review

• Review of Sub-Assembly concept and details of HCAL-J Module

to Subassembly connection

• Conceptual design document submitted by CMU

• Attended by:

• JLab: Mark Jones, Robin Wines, Whit Seay, Alan Gavalya

• CMU: Gregg Franklin, Vahe Mamyan, Alexa Johnson

• 2nd Day follow-up meeting discussed small design change in

HCAL-J front plate

• JLab will take over engineering of the support structures for

the 4 sub-assemblies this summer

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4) Status of ProductionLight Guide Production

Laser Cutting90 seconds each

Bending JigRadiant Heater

Gluing JigSolvent Welding

Need to remember to take a photo of this

Diamond Fly-cutting

Oxy-hydrogenFlame Polishing

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Light Guide Production Status

11 Completed and glued to WLS

30 more assembled- awaiting final milling and gluing WLS

Components for ~20 more in queue for gluing

Summary: Will soon have 50 completed light guides with many more parts already in queue for machining and bending

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Production Status Summary• Proto3 and Proto4 could be considered first two modules

• Absorbers and scintillators ready for installation

• Purchased and received vacuum screws, plastic PMT adapters, etc.• VersaFab Machine Works producing 300 sheet-metal cans, 600 internal

shims, 1800 “ribs”• Will deliver 33% at a time• 2 weeks late on first shipment, but any day now…

• Awaiting delivery of custom-width aluminized Mylar• Activities At CMU

• 300 Steel Front End Plates and 300 Al. Back End Plates• All 600 have been cut to size• 40 each are being finalized (machined, drilled, tapped)

• ~ 50 Light guides and WLS ready• Expect to assemble~ 2 modules per day once cans are delivered• First shipment to JLab early summer (60 modules at a time)

• Must clear space as we assemble

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Milestone Review

• Detailed design Completed: June 2014 (+ 2 months float)

DONE• Design review: (Sept. 2014) (+3 months float)

Scope to include sub-assembly concept. Dec. 2014DONE

• Module construction initiated: Oct 2014 (+4 months float)First two modules of finalized design under constructionLarge scale assembly awaits rib and shell order completionWill start Jan./Feb.NOW BEHIND (unless Proto3 and Proto4 counts or assembly of light guides counts)

• Module assembly 50% completed: March, 2015 (+4 months float)APPEARS THAT WE WILL BEAT THIS

• Construction completed: Sept. 2016 (+9 months float)