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Development of Connector for New MPPC Ceramic Package in T2K Project

This document summarizes the development of connectors for the new ceramic package of the Multi-Pixel Photon Counter (MPPC) in the T2K experiment. We explored two connector prototypes, emphasizing reproducibility, light yield, alignment, and handling. The two-part connector demonstrated improved light yield and reproducibility, while the three-part connector offered easier handling. The measurement setup for photon detection efficiency (PDE) with the connectors is ongoing, aimed at further optimizing performance. Our findings will contribute to future advancements in this technology.

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Development of Connector for New MPPC Ceramic Package in T2K Project

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  1. Connector development M.Taguchi(kyoto) T2K ND280meeting@KEK Nov.7.2006

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

  3. New MPPC package delivered in Oct. Baseline package for T2K We developed the connector to a fiber which match this package MPPC new ceramic package sensitive region 4mm 6mm

  4. 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

  5. 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 screw Prototype 1 ~2parts type~ fiber MPPC

  6. screw Prototype 2 ~3parts type~ fiber MPPC • 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 fixture

  7. Reproducibility 2parts type light yield (arbi.unit) light yield (arbi.unit) 3parts type +15% reproducibility is better for 2parts type -15% • measure the light from fiber, attaching and detaching the connector repeatedly blue LED connector WLSF

  8. Characteristics of each connector 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

  9. 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 Cap Type Package( Rough draft ) fiber stop by friction. MPPC we will make and test this soon Spring

  10. 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

  11. Supplement

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

  13. Setup for measurement of PDE with connector same amount of light connector WLSF blue LED PMT PDE(MPPC with connector) /QE(PMT) p.e.(MPPC) = p.e.(PMT)

  14. setup for measurement of PDE PMT scan blue LED WLSF 1mmφslit MPPC p.e.(MPPC) PDE(MPPC) /QE(PMT) = p.e.(PMT)

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