MINERvA Director Review

10 January 2005 1

MINERA

NuMI

MINERA Director’s Review10 January 2005

H. BuddUniv. of Rochester

Optical Cables and Scintillator Extrusions

MINERvA Director Review


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Active detector elements

WLS (wavelength shifting) fibers in scintillator Extruded triangular scintillator pieces 3.3cm by 1.7 cm

ID - Active Target - triangular scintillators form a layer (128 triangles/layer) Light sharing between adjacent strips gives position measurement

Extruded square scintillator pieces – 1.9 cm square OD - Side hadron calorimeter - 6 layers

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Active Detector Elements

WLS fiber – 1.2 mm, 175 ppm, s-35 multi-clad Kuraray fiber Same kind of fiber used CMS HCAL and CDF Preshower

» Slightly less flexible than the most flexible Kuraray fiber

» With attenuation length of more transparent fiber Readout one end – mirror the other end Longest WLS fiber length – 3.5 m

Clear fiber in optical cables takes light to PMT box 1.2 mm s-35 Kuraray multi-clad fiber Length about 1.2 m OD -1.4 m ID

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Active Detector Elements

PMT Box Brings light from clear fiber cable to multi-channel PMT The piece which consists of the optical connector and clear fibers we call

the ODU (optical decoder unit)» Cable end connects to the clear cable

» Fiber end glued to PMT cookie

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DDK Optical Connectors and Cables

3 Parts Ferrule, box, and clip – uses clip instead of pins and screws Designed by DDK (now Fujikura) in conjunction with the CDF Plug Upgrade

RMS of light transmission - 1% to 2% (connection – reconnection) For CDF – holes for 0.83 mm, 0.9mm, and 1.0 mm fiber Also used by FOCUS, D0, and STAR experiments

We will have DDK design new ferrule for 1.2 mm fiber – same clip and box Optical Cables – MSU STAR method to make light tight

For light tight - RTV boot on both ends with black tube surrounding the fiber

Clip

Box

Ferrule

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Physics Requirements

We require enough light to get a position resolution of 3 mm 8 pe/layer (photo-electron /layer) from Monte Carlo program

» Per doublet for a MIP with perpendicular incidence

To determine particle type from dE/dx 8 pe/layer from Monte Carlo program

The position and dE/dx determination should be measured directly rather than deriving them from the Monte Carlo program with the # pe

Less than a few mm of warping of scintillator in xy direction Need to know position of scintillators However, source scanning of layers will give this information

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Vertical Slice Test I - # pe

#pe is measured with VST I First triangular extrusions from Lab 5 - NICADD/FNAL

Extruder However, the hole is oval and slightly oversize

» Highest light yield – fiber tight in hole

» 0.5 m long and painted with TiO2

Minerva electronics and MINOS pmt (M64) in MINOS PMT box

1.2 mm, 3.5 m, mirrored WLS fiber – mirror at scintillator end

» Length simulates the worst case No clear 1 m cable in VST I

» must multiply the result by 0.75

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VST I

#PE – 1 Layer of triangles 10 pe – scaling the single pe peak 12 pe - inefficiency with /10 optical filter in connector These agree well – average – 11 pe Scale to 11*0.75(for cable)=8 pe/layer

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Near Term Tests

VST II - measure position resolution directly Jan – Feb 2005 All parts exists Use next generation of extrusions Measure position resolution Compare light between the 3 layers to show dE/dx

resolution Compare to Monte Carlo program VST II is this decisive test

Source R & D Tests Illuminate a separate 5 triangles array with a source Compare light between different configuration Compare glue to no glue, etc.

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NICADD/FNAL Extruder

Extruded scintillator much cheaper than cast scintillator Can create unique shapes - MINERvA triangles

FNAL group experienced with extruded scintillator – MINOS, K2K Extruder is a collaboration between FNAL and NIU, owned by NIU Computer controlled

Regulate mixture of polystyrene pellets and dopants Optimize temperature and extrusion speed

The Extruder is the ideal size for MINERvA production

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Extruder Dies

Two scintillator shapes – triangle and square Triangular extrusion is more challenging shape

VST I – first die Supported by FNAL, NIU, DOE-HEP through Rochester Re-tune for making triangular extrusions for VST II

Development of new die for square scintillator Expected to be easier

Co-extruder – coat scintillator extrusion with TiO2 MINOS scintillator manufactored with coextruder

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Quality Control and Production

Production run tolerances for triangular shapes Hole production and testing

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Fiber Procurement

Purchase 57 km of clear fiber – Rochester Task QC – same procedure as CMS

» Use cable testing box to inject light to fibers» Test 5 fibers in batch ( a fiber preform)» QC tests done by Rochester physicist and a Rochester technician

Purchase 119 km of WLS fiber – Rochester Task QC – Lab 6 automatic fiber scanner, UV lamp and pin diodes

» Not working now» Could use manual setup in Muon Lab – source and PMT» Measure 5 fibers from a batch

Mirror fibers in Lab 7» FNAL contribution budgeted in FNAL impact statement» Lab 7 did this for CDF Plug, FOCUS, STAR ECAL, CMS HCAL, D0» 3 steps – ice polishing sputtering and protecting the mirror

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Connector Procurement and Polishing

DDK will design new ferrule for 1.2 mm fiber – initial QC Measure initial connectors with Avant Optical Gauge Comparator

» Coordinate measuring machine owned by Tech Support

» They will measure the position and angle of holes Measure RMS of the light of initial set of cables

Polishing at Lab 7 Lab 7 has been polishing connectors for the last 10 years

» They have experience polishing these connectors - FOCUS DDK connectors have fiberglass which dulls the diamonds

» New diamonds or relapped diamonds after 40 connector polishes Lab 7 polishes 10 connectors at a time

» FNAL Lab 8 need to build fixture to hold the connectors

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Optical Cables and ODU Assembly

ODUs – fibers-connector part used for the PMT box Like cable, but not made light tight

Cable construction same techniques and CDF and CMS To make light tight – copy MSU STAR method

Put RTV boot on both ends of cable Can prototype existing DDK connectors for 1.0 mm fiber

Fiber diameter doesn’t matter for test certain techniques Test RTV light tight boot Set up the production line

QC – Build quality control device Build light injection box – like CMS calibration box Build box to take light in cables to pin diodes Multi-channel pico-ammeter system readout out pin diodes

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Scintillation Extrusion Schedule

Schedule based on experience from extruder R & D 2 dies – 2 months of testing the tuning for each die 90 Days for production People

2 FNAL technicians NIU Production Coordinator – 50% time NIU Run Supervisor – 50% time

9 month after June 1 – March 2005

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Schedule

WLS Fiber 3 months to acquire WLS fiber - 4 months to mirrors fiber – 4 technicians June 2005 – Dec 2005 An Fall accelerator shutdown could effect this schedule

Optical Cables and ODUs 3 months to acquire prototype ferrule 1 month to test 1 month acquire production connectors 1 Rochester R&D Technician – Finish Nov 2005 7.5months – 2404 ODUs – Rochester 4 techs – Finish Jun 2005 12 months - 4607 Cables – 6 techs - Finish Jun 2006

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Cable Costs

As-real eng – as realized and engineering costs estimate Exp as-real – direct extrapolation from as realized costs Act as-real – actual as realized costs Sim/exp as-real – direct/similar extrapolation from as realized costs

Sub-category roll-ups BoE Type BoE SourceCable/ODU Materials

optical cable tester M&S $13,510 0.40 n/a as-real eng CMS Cal Box + quotesclear fiber (includes vendor shipping) $231,203 0.59 15% (37.5%) vendor quote Kuraray

mold and associated tools $5,063 0.28 4.5% (14.5%) exp as-real MSU StarRTV $7,187 0.31 4.5% (14.5%) exp as-real MSU * , Ventor

black cable sheathing $8,432 0.43 4.5% (14.5%) exp as-real MSU * , Ventorgluing tools $2,880 0.20 n/a as-realized cost CMS HCAL

epoxy and gluing consumables $12,634 0.37 4.5% (16%) exp as-real CMS HCALCategory Total $280,910 0.54

Cable/ODU Laboroptical cable tester EDIA, assembly $8,720 0.40 n/a act as-real CMS Cal Box

design of light tight RTV mold $8,640 0.20 n/a act as-real MSU *Prototyping $47,400 0.30 n/a sim exp as-real MSU *

Technicians in Factory $316,540 0.60 4.5% (16%) sim exp as-real MSU * + CMS HCALCategory Total $381,300 0.54

Spare & Waste

Cost + Contingency Cont

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Polishing and WLS Fiber Costs

Sub-category roll-ups BoE Type BoE SourceConnector/Polish Materials

connector cost (incl. vendor design) $81,754 0.33 4.5% (16%) vendor quote Fujikura quotepolishing diamond abrasive $24,640 0.53 4.5% (39%) exp as-real Lab 7 + CDF exper relapping diamond abrasive $52,635 0.53 5.5% (39%) exp as-real Lab 7 + CDF exper

polishing consumables (bits, etc.) $5,926 0.66 6.5% (39%) exp as-real Lab 7 + CDF experCategory Total $164,954 0.42

Scintillator MaterialsScintillator Dopants $113,400 0.50 11.5% (17.5%)vendor quote Kuraray

Bulk polystyrene (Styron 663) $95,505 0.52 11.5% (17.5%)vendor quote Single BatchCategory Total $208,905 0.51

WLS Fiber Materials and Laborfiber and vendor shipping $471,735 0.51 15% (37.5%) vendor quote Kuraray Oct 04

shipping from FNAL to VA factories $19,280 0.40 37.5% (37.5%)physicist quo Single shipping

Category Total $491,015 0.51

Spare & Waste


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Costs – Scintillator Extrusions

Scintillator Extrusions LaborProduction Coordinator & Run Supervisor 59,441$ 1.28 76,084.48 Exp as-real Prototype of MINERvA strips

Scintillator Extrusion Equipment and MaterialsCo-extruder 52,000 1.00 52000.00 vetdor quota + contDie and sizing tooling (4 diff. sets @ $12,000/ea.) 48,000 1.00 48000.00 sim/exp as-real From prototype die

Scintillator Dopants $113,400 1.00 $113,400 0.50 11.5% (17.5%) vendor quote KurarayBulk polystyrene (Styron 663) $95,505 1.00 $95,505 0.52 11.5% (17.5%) vendor quote Single Batch

Consumables (jars, tubing, labels, UV lamp,...) 6,000 1.28 7680.00 Exp as-real VentorShipping 5,307 1.28 6792.96 physicist quoteMachine shop 1,164 1.28 1489.92Carpenter shop (to build 28 crates) 15,456 1.28 19783.68 vendor quote

BoE Type BoE SourceOverheadCost + Contingency


Spare & Waste Contingency

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MINERvA Director Review

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