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A Common Gel Defect

A Common Gel Defect. Crazing,. Here seen along a length of the MuMetal. GE 6156 has been the baseline gel since Amanda. Not sold as an optical Gel Color is uncontrolled Processing controversial ~$50.00/DOM Dow Corning Q3-6575 is being considered as an alternate.

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A Common Gel Defect

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  1. A Common Gel Defect • Crazing,... Here seen along a length of the MuMetal Daniel Wahl

  2. GE 6156 has been the baseline gel since Amanda. Not sold as an optical Gel Color is uncontrolled Processing controversial ~$50.00/DOM Dow Corning Q3-6575 is being consideredas an alternate. Unmixed samples have all been water clear. Dow Corning processes their electronic grade silicones differently to decrease the level of volatile materials. Observed out-gassing behavior is much less active. ~$30.00 to $40.00/DOM Depending on packaging. RTV Gels Daniel Wahl

  3. Optical/Mechanical coupling of PMT to Benthos Sphere Greater than 10% transmission at 300 nm 50% transmission at lambda <= 325 nm 85% or better transmission at 350 nm Must not scintillate or fluoresce (300nm < lambda < 600nm). Must tolerate temperatures from –70C to 45C with no more than 2% loss of room temperature transmission.Perhaps two GEL types, one for IceTop, one for In-Ice? Requirements Daniel Wahl

  4. Comparative Tests • Optical transmission • Cary (Varian) 300 Scan UV-Visible Spectrophotometer • Stiffness, Depth(Force,Temperature) • MOHR DIGI-TEST Fruit Quality Testing System, (yes fruit) • Visual Inspection (Before and after FAT) • Blue eyes Daniel Wahl

  5. Plastic vs Quartz Cuvettes Daniel Wahl

  6. GE, 7 Samples from Production Daniel Wahl

  7. GEL Comparison in plastic Daniel Wahl

  8. GEL Comparison in Quartz Daniel Wahl

  9. Gel Stiffness Data • Both Gels mixed at production ratio 1:1.08 A to B Daniel Wahl

  10. FAT #1 of 96 DOMs 3 Crazing Improved 13 New Crazing Appeared, (Minor) FAT #2 Data Collected and unavailable Visual Inspection Daniel Wahl

  11. Q3-6575 as shown in previous slides. Five DOMs in FAT 2 Three Degass methods: Mix A&B degass 20 minuets. 75 torr Bubbles, 25 torr Perfect, 7.5 torr Perfect. FAT Data? Q3-6646 Highly purified version of Q3-6575 One DOM in FAT 3, No Data Yet Q3-4154 Less Pt catalyst for clarity. (-45C) Q3-6679 Fluorogel Good to -70C, (expensive) Other Dow Corning Gels to Consider Daniel Wahl

  12. GE Quality perception low Unwilling to provide information Dow Corning Provides 100% Raw Material for GELs Worldwide. Responsive with samples, and technical assistance. Willing to “tweak” standard GELs, or Develop New. Distributor authorized to repackage. Prices lower or competitive. GE verses Dow Corning Daniel Wahl

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