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Fiber Milestones: WLS Fiber for Tracking Proto. Quick summary All Tracking prototype WLS fiber arrived in 2 shipments 60% shipment & 40% shipment 2 shipments due to availability of funds 60% shipment shipped in July The 40% shipment is about ½ finished at the shutdown

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fiber milestones wls fiber for tracking proto
Fiber Milestones:WLS Fiber for Tracking Proto.
  • Quick summary
    • All Tracking prototype WLS fiber arrived in 2 shipments
      • 60% shipment & 40% shipment
      • 2 shipments due to availability of funds
    • 60% shipment shipped in July
    • The 40% shipment is about ½ finished at the shutdown
      • 40% shipment ready to ship about 1 month after shutdown finishes
        • Shutdown finishes Oct 12, but PPD will try to get crew back earlier
      • very large loss of schedule contingency
    • Not expected to impact WBS 3and downstream schedules
    • Have two functioning QC tests
      • both show little variation
      • n.b., these two techniques don’t definereflectivity in the same way, butboth are sensitive to mirror variations

MINERvA WBS 1,2,4: Scintillator and Fiber

wls production
WLS Production
  • We expect to start WLS production mirroring in mid January 2008

MINERvA WBS 1,2,4: Scintillator and Fiber

upgrades since dir rev
Upgrades since Dir Rev
  • We have added 2 new technicians
    • One went from part time to full time in July
    • One starting ½ time in Aug & Sep (shared with CMS ) and full time in Oct
    • Both of these technicians are being trained for ODU production
  • We have doubled the number of gluing stations from 60 to 120
  • We have more than doubled our table space for production
  • We have identified the table space for boot production

MINERvA WBS 1,2,4: Scintillator and Fiber

fiber milestones odu for tracking proto
Fiber Milestones:ODU for Tracking Proto.
  • Quick summary
    • ODUs approximately 60% complete
    • some Q/C issues identified and addressed
    • ODU quantities required were updated by downstream factories

MINERvA WBS 1,2,4: Scintillator and Fiber

slide5
ODUs
  • For tracking prototype we are supposed to ship 543 ODUs
  • 335 ODUs have been shipped
    • Pass optical QC & fit test
  • Another 120 ODUs have passed the optical QC
    • We are modifying the fit test and are waiting for test hardware from Lab 7
  • Another 200 are in various stages of production
  • Optical QC test
    • Optical QC requires each fiber in a ODU must have its value > 90% of the transmission mean for that channel
    • 5.7% failed the optical QC
    • In addition…
      • Another 2.0% of ODUs failed because we purposely pushed the diamond to its limit before relapping/replacing to test its lifetime
      • 7.5% failed to clip into box because of epoxy on back end of ferrule.
        • We noticed this problem after producing 300 ODUs
        • In the last 100 ODUs the problem did not occur
        • In the future we think < 1% of the ODUs will fail this test.
      • The failure rate is slightly higher than before as we bring on these new people

MINERvA WBS 1,2,4: Scintillator and Fiber

tracking prototype odus
Tracking Prototype ODUs
  • Estimate of failures for future production
    • 5% optical + 1% epoxy failure, if no other problems

MINERvA WBS 1,2,4: Scintillator and Fiber

fiber milestones cable production
Fiber Milestones: Cable Production
  • In a slide…
    • Work on cable mold significantly delayed
      • conscious choice because of large float
    • Cable production problems identified
      • change in ferrule length impliesneeded mold modifications
      • problems with pouring process andES&H impact of the material(polyurethane with Al(OH)3 fire retardant)
      • material flow into andwear on mold ejection parts
    • Remediation
      • new procedure removes need for ejector
      • in the process of completing new hardware
      • estimated startup in 4-6 weeks

MINERvA WBS 1,2,4: Scintillator and Fiber

optical cable r d
Optical Cable R&D
  • New Mold
    • Use sliding clamp to press connector against mold to prevent mold material from flowing to front of connector
      • The Alumilite polyurethane did not flow into around the connector to the polished fibers as it was doing with the old mold
    • No extraction pins which got gummed up in previous mold
      • Use straps put in the boot
      • Mold cheaper by more than a factor of 2
    • We have successfully made boots with new mold and our original molding material, Alumilite polyurethane
    • Problem with mold, connectors fit too tight in the mold right now
      • material will have to be removed in the mold
      • about 1 week of work.

MINERvA WBS 1,2,4: Scintillator and Fiber

mold material
Mold Material
  • But the Alumilite is not ideal
    • It is fluid than we want
    • Will require a chemical hood, restricts how we do production
  • We have identified 2 epoxies which look very promising to replace the Alumilite, but we have not finished the R&D
    • Both epoxies packaged for 2 component mixing guns
    • Both have about the right viscosity
  • Heigl MP5405bk – 1st choice
    • Hardens in 15 minutes, no chemical hood needed
    • Successfully & easily put boots on 5 cables with original mold
    • Problem, Its black material transmits red light
      • Heigl will work with us to fix this problem.

MINERvA WBS 1,2,4: Scintillator and Fiber

mold material1
Mold Material
  • Resinlab EP1046fg
    • Can pull boot out after 1.5 hours, not ideal, but good enough to finish project
    • Epoxy is fine, other than the setting time
  • None of these 3 products are fire retardant
    • ES&H suggestion is to paint with fire retardant paint
    • Sent initial set of Heigl painted sample to for fire test
      • Had problems at sharp corners, but successful otherwise
    • Made new samples to fire test which fixed problems with sharp corners
      • Made samples of all 3 materials
      • They have been given to Jim Priest

MINERvA WBS 1,2,4: Scintillator and Fiber

cable production
Cable Production
  • We expect to start tracking prototype cable production on Nov 1 2007
  • Full Cable production starts on May 1 2008

MINERvA WBS 1,2,4: Scintillator and Fiber

clear fiber qc
Clear Fiber QC
  • We measured the attenuation length for the ODU fiber
  • Measured attenuation length of ODU fiber
    • 5 m pieces
    • Cut back test
    • Use 1 m WLS jumper
      • Get a 50 cm longer number as opposed to a 50 cm clear jumper
      • CMS and some early MINERvA tests we used 50 cm clear jumper

MINERvA WBS 1,2,4: Scintillator and Fiber

clear cable qc
Clear Cable QC
  • Get l = 815 cm
  • Equivalent to 770 cm in measuring it in the way that CMS did and we got about 800 cm for the attenuation length in CMS for 0.94 mm S-35 fibers
    • So CMS and MINERvA clear fibers are fairly close in attenuation length

MINERvA WBS 1,2,4: Scintillator and Fiber

esh qa changes
ESH/QA Changes

ESH/QA:

  • WBS 1:
    • Removed weekly cosmic ray light yield check with extruded strips
      • always tracked more precise source tests which are performed daily
  • WBS 2:
    • QC procedure uses razor blades for cutting fiber at 45°
      • recent concern raised by PPD ES&H. no directive yet, but in communication
  • WBS 4:
    • QC improvements already discussed
    • We are working with ES&H on the new mold material both for personal safety and fire safety
      • Heigl epoxy does not require a chemical hood

MINERvA WBS 1,2,4: Scintillator and Fiber

identified risks at cd 3a wbs 4 fiber cables
Identified Risks at CD-3a:WBS 4 (Fiber Cables)
  • Final tests of light-tight mold essentially failed to hold up in a production situation
    • Solution is seen in either redesigning the mold or getting a new mold material and we did both
    • R&D should be finished in September 2007
  • Fiber costs carry significant contingency to reflect past changes in pricing from Kuraray (less of a problem with clear fiber than WLS)

MINERvA WBS 1,2,4: Scintillator and Fiber

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