Waveguide for Station 5

M. Yoshida

(Osaka Univ.)

• Test assembly– 450cm-long– Select better fiber canes

• External waveguide– 290cm

• Internal waveguide– 140cm

• Quality assessment has been done in Osaka Univ.

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 fibersrejected

Connector parts of waveguide for station 5

• Bulkhead/Lead connector (1A / 2A)– 1.10 mm drilling with count

ersunk hole on the back end (by G-Tech)

• 22-way connector (3A)– 1.08 mm holes by 1.067 m

m drill (AC precision)• D0 connector

– 1.067 mm drilling (Fermilab)

• Flexible conduit– Adaptaflex PAFS21 and P

AFS28• Heat shrink tube

External waveguide

Internal Waveguide

1400mm

1-20

21-42

43-64

65-86

87-108

109-128

１１ AA 3A3A3B3B1

2

3

4

5

6

1-128

１１ AA　　SurfaceSurface

1 - 20

1 - 22

1 - 22

1 - 22

1 - 22

1 - 20

3A Surface3A Surface

1-1

1-2

1-3

1-4

1-5

1-6

Internal Connector (１ A,３ A)

External Connector（ D0,２A)

1 2 3 4 5 6 7 8

121 122 123 124 125 126 127 128

２２ A SurfaceA Surface

D0 SurfaceD0 Surface

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

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

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

Channel Assignment

• Inject light from a clear fiber to connector surface

• Scan injection point by hand

• Take movie

• Perfect assignment on all the connectors!

camera

waveguidefiberscan

handy flash

LED transmission test- External waveguide -

• All the fiber have good transmission within 10%

10%

#16 13170

LED transmission test- Internal waveguide -

10%

• All the fiber have good transmission within 10%

11914 (#87)

Summary• The first production of external/internal waveguide show good trans

mission 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