Waveguide for Station 5

1
Waveguide for Station 5

• M. Yoshida
• (Osaka Univ.)

2

• Test assembly
• 450cm-long
• Select better fiber canes
• External waveguide
• 290cm
• Internal waveguide
• 140cm
• Quality assessment has been done in Osaka Univ.

3
Fiber preparation- Population of measured fiber
brightness -

• Cut fibers into 450cm canes
• Glue fibers on test cookies
• Photo of flash reflection
• LED trasmission

12 bad fibers rejected
4
Connector parts of waveguide for station 5

• Bulkhead/Lead connector (1A / 2A)
• 1.10 mm drilling with countersunk hole on the
  back end (by G-Tech)
• 22-way connector (3A)
• 1.08 mm holes by 1.067 mm drill (AC precision)
• D0 connector
• 1.067 mm drilling (Fermilab)
• Flexible conduit
• Adaptaflex PAFS21 and PAFS28
• Heat shrink tube

5
External waveguide
6
Internal Waveguide
1A
3A
3B
1
1-20
2
21-42
3
1-128
43-64
4
65-86
5
87-108
6
109-128
1400mm
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Internal Connector (1A,3A)
1-1
1 - 20
1-2
1 - 22
1-3
1 - 22
1-4
1 - 22
3A Surface
1-5
1 - 22
1-6
1 - 20
1A Surface
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External Connector(D0,2A)
2A Surface
D0 Surface
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Mechanical strength of the external waveguide

• D0 connector boot and flexible conduit can be
  detached by pulling by hand
• Found that heat shrink tube at the connection
  does not have enough strength
• Epoxy glue at the connections, and then covered
  by heat shrink tube
• Also, we will find better heat shrink tube
• Glue paint on inner wall of the tube

10
Flash light reflection- External waveguide -

• No fiber has reflection at D0 connector
• One fiber has reflection at lead connector end
• Incomplete optical cement / Air bobble (?)
• Damage of larger diameter fiber (?)
• Need more careful treatment and feedback

11
Flash light reflection- Internal waveguide -

• All the fiber have no reflection light
• Slight damage on cladding layer of the 5th 22-way
  connector
• The problem seems to be just on the surface
• Could be recovered by final polishing at Fermilab

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Channel Assignment
handy flash

• Inject light from a clear fiber to connector
  surface
• Scan injection point by hand
• Take movie
• Perfect assignment on all the connectors!

waveguide
fiber
scan
camera
13
LED transmission test- External waveguide -

• All the fiber have good transmission within 10

10
16 13170
14
LED transmission test- Internal waveguide -

• All the fiber have good transmission within 10

10
11914 (87)
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Summary

• The first production of external/internal
  waveguide show good transmission in all the
  channels.
• 3 bundle with test cookies have been delivered
  (675 fibers in total)
• 450 cm long
• Check bad fibers by Takatomi and Hideyuki, and
  send them back to G-Tech in this week.
• G-Tech will ship 5 sets of waveguides to Fermilab
  in the end of Feb.
• The fabrication process will be improved by
• Fixation by glue at the conduit connections
• Better heat shrink tube with glue painted inside
• More careful gluing on the connector surface
• Strict rejection of larger diameter fiber