Faraday Shielding for Barrel TRT

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Faraday Shielding for Barrel TRT

• Jack Fowler
• Duke University
• Spain Workshop - 2003

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Inner Cylinder Shielding

• Inner cylinder will be coated with copper (35
  micron) clad kapton (25 micron) (Total thickness
  100 microns)
• Due to the material width, there will be 3
  separate wraps
• The wraps will not overlap

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1st Prototype of Cylinder

• Epoxy (AY 103 / HY 991) will be applied to the
  surface of the cylinder at an average thickness
  of 100 microns
• We have measured a total thickness of epoxy and
  shielding material of 250 to 300 microns

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Epoxy Application
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Applying Copper/Kapton
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Seams between wraps

• 3M Copper EMI Shielding Tape 1181 will be used to
  cover the seams of the wraps (66 microns thick
  total and 35 micron copper)
• The tape will be spot soldered at the joint to
  the shield. This will be done approximately
  every 20 cm along the length.

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Cylinder with Shield
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Inner Cylinder Summary

• Kapton coated copper will be epoxied onto the
  cylinder
• The seams will be covered using copper tape.
• These joints will also be soldered.
• Maximum thickness should not exceed 350 to 400
  microns. We have 1 mm.

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Space Frame Shielding

• The complete outer surface of the space frame
  will be covered with 3M Embossed Copper Foil
  Shielding Tape 1245 without tin plating (shown
  is tin plated) 100 microns thick / 35 micron Cu
• The cooling tube corners will not be covered

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Tape coverage

• 18 mm of the space frame in Z will be covered.
• The edge of the tape and frame will be coated
  with epoxy (AY103 /HY991) to prevent peeling

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Soldered Joints

• All of the intersection points of the tape pieces
  will be spot soldered to ensure a long term
  electrical connection

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Joining the Inner Cylinder to Space Frame

• The cylinder shielding will be applied within 0.5
  mm of the area the space frame will occupy.
• Soldered connection will be made for each 1/32

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Space Frame Summary

• Embossed Bare Copper tape will be used to shield
  the space frame
• The inner cylinder will be connected to the space
  frames by soldered connections.

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Outer Cylinders

• The outer cylinder will be covered with the same
  copper/kapton material on the outer surface.
• The connection to the will most likely be made
  using tape around the outer corner.