Fuse Box Status

1

• Fuse Box Status
• Chiho Wang
• Duke University

2
Fuses

• Prototype fuses received 06/22/2001
• Spec.
• L 5.8 mm
• W 2.0 mm
• H 4.2 mm
• (including legs)
• 5 random samples
• L 5.82 /- 0.03 mm
• W 2.4 /- 0.17 mm
• H 4.33 /- 0.09 mm
• With new fuse box prototype
• Length OK
• Width OK
• Height A little hard to squeeze in. Can it be
  smaller? Or, can we get another 1mm for fuse box?

3
New Fuse Box Prototype

• Dimension changes from previous prototype
• Height (z) 4x2mm --gt 5.5x2mm (3 mm)
• Length (?) 19mm --gt 20.15 mm (1.15 mm)
• Width (r) type dependent, no change

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Fuse box dimension
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Remaining Design Issues

• Fuse box mounting
• Free hanging from the end of HV kapton
• Risk in damaging kapton.
• A rigid mounting
• Require interaction with space frame or cooling
  plate snake cable...
• Fuse box grounding
• From fuse box to tension plate
• Require interaction with snake cable cooling
  plate ...
• Solder soft wire between HV kapton ground shield
  and tension plate.
• May affect kapton flexibility

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Fuse Box Components

• Duke
• FR-4 casing
• FR-4 printed circuit film
• 1812 size 1nF filter capacitors (same as module
  capacitor)
• 1206 size 1-2k filter resistors
• Truncated Molex 2759 female terminal
• Stycast potting glue for coating
• Furon K102, 0.001 Kapton 0.0015 Acrylic
  adhesive tape
• 2-56 Nylon screw
• Penn/CERN/Russia(?)
• Habia HFI 150 minicoax HV cable (?)
• Connector for minicoax to PPB1
• Fuses
• custom made components

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Production Scheme

• Once design is finalized
• 2 month for part collection fabrication.
  Including
• Machining of FR-4 casing
• Fabrication of printed circuit
• 4 month for assembly
• Based on 200 fuse boxes with 2.5
  boxes/person/day
• Could we send this out? (Krakow?)

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Summary

• A prototype fuse box has been assembled with the
  prototype fuses. No obvious dimensional problem.
• Fuse box mounting and grounding schemes are yet
  to be addressed
• When design is finalized. Production is estimated
  to take 6 month