Connector development

M.Taguchi(kyoto)T2K ND280meeting@KEK Nov.7.2

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Contents

• MPPC new ceramic package• Prototype of connector• Reproducibility• Future development• Summary

MPPC new ceramic package

• New MPPC package delivered in Oct.• Baseline package for T2K

• We developed the connector to a fiber which match this package

6mm

4mm

sensitive region

Requirement to the connector

• light yield - alignment - minimize the distance b/w fiber and MPPC• Easy handling• Compact size• reproducibility• Low-cost• Detaching is possible

Prototype 1 ~2parts type~

• 2 parts• Touch the edge

of fiber to the surface of MPPC with screw

• It is impossible to screw when fiber and MPPC are fixed

MPPC

fiber

screw

Prototype 2 ~3parts type~fiber MPP

Cfixture

screw

• 3 parts• Touch the edge

of fiber to the surface of MPPC with screw

• It is possible to screw when fiber and MPPC are fixed

Reproducibility

+15%

-15%

light yield (arbi.unit)

2parts type

3parts type

light yield (arbi.unit)

blue LED

connector

reproducibility is better for 2parts type

WLSF

•measure the light from fiber, attaching and detaching the connector repeatedly

Characteristics of each connector

Type Light yield

Easy handling

cost reproducibility

size

2parts

Now studying

Bad ~0.1$

Good(~2%) 1x1cm

3parts

Now studying

Good ~0.1$

Bad(~10%) 1x1cm

the connector which have advantages of both types?

- good reproducibility 2 parts

- can connect the fiber and MPPC even if they are fixed

cap type package without screw

Cap Type Package( Rough draft )

• 2 parts• fixture for fiber

stops by friction against the fixture for MPPC

• use spring to touch the edge of fiber to the surface of MPPC

Spring

stop by friction.

fiber

we will make and test this soon

MPPC

Summary

• developed the 2 type of connectors which match the new ceramic package

- reproducibility is better for 2parts type - handling is easier for 3parts type• now consider new type of connector• measurement of PDE with connector is

on going

Supplement

Alignment

•make alignment of MPPC to a fiber with the outside frame of package HPK say this size is made with best precision

Setup for measurement of PDE with connector

blue LED

WLSF

connector

PMT

same amount of light

PDE(MPPC with connector) /QE(PMT) =

p.e.(MPPC)

p.e.(PMT)

setup for measurement of PDE

MPPC

PMT

1mmφslit

scan blue LED

WLSF

PDE(MPPC) /QE(PMT) =p.e.(MPPC)

p.e.(PMT)