Clear Fiber and Wave Guide Fab.

Makoto YOSHIDA (Osaka Univ.)July 14-17 MICE FT workshop @FNAL

Components(5 SciFi stations in multiplex case)

• SciFi station Service hole on flange– 18 holes/connector x 12 connector/plane x 3 planes/station x 5 stations = 3240 cl

ear fibers (+ 360 connectors)• Flange <-> VLPC cassette

– 18 holes/connector x 12 connector/plane x 3 planes/station x 5 stations = 3240 clear fibers (+ 180 connectors)

– 3240/126 = 26 D0 connectors– 26/8 = 4 VLPC cassette

D0 connector

Clear Fiber

• Kuraray round-type multi-clad s-type– cladding size: 6% of diameter– tolerance of diameter: 2.5% (at 3)

• Diameter : 0.35 mm x 3 = 1.05 mm– 7-SciFi-Multiplexed layout

• Costs: 2$/m???– (2m+4m)x6480x2$/m=78,000$

Waveguide Fabrication• trial to glue clear fibers on connector

– REPIC• reinforcement by plastic tube

– CI Industry• polishing contact face

REPIC

Polishing Contact Faceoptical cement

epoxy glue

diamond machine & polishing

Test items for clear fiber

• w/o VLPC in Japan– Light shielding– Dead channel (Construction efficiency)– Attenuation in fiber

• 2m / 4m / 6m

– Multiplex feasibility• 1.05mm / 0.35mm

– Transmission at contact face of 18-hole connector– long term bending test

• w/ VLPC in FLNAL– Uniformity (accuracy of fiber alignment)– Light yield in SciFi– Noise from RF

Prototype for September test1.05 mmx 18

0.35 mmx 126

x7

D0 connector

x6 VLPCcassette

1.05mmx 4m

x7

0.35mmx 4m

1.05mmx 2m

1.05mmx 6m

fiber will be shielded by ZipperTube

1.05mmx 2mintermediate fibers

x3

(7 views84x18x4m=6048m)

3.5 views42x18x4m=3024m

Schedule• Clear fibers will be delivered by the end of July (7/21) • Assembling of fibers will be done before the middle of

August.• Basic tests (quality, alignment, attenuation) will be

finished and waveguides will be shipped to FNAL in August.

Proposal for mass-production• CI Industry can produce 18-hole opt. connector by machining (not m

olded).– Easy to control quality.– Cost: 20,000$ / 2000 connectors

• sampling test of clear fiber– measure diameter to determine margin of connecter hole

• change SciFi diameter : 0.350 0.300 mm– avoid loss at connectors– smaller modify on D0 connector– to fit diameter of fibers between D0 connector and VLPC