「光検出器MPPCの応答曲線の大量測定

A large amount of measurement of response curve of photodetector

MPPC

University of tsukubaHiroko koike

筑波大学　 6/18小池　博子 1

motivation

PMT ADC counts

MPPCP.E.

2

[0]*(1-exp(-1*(x-[1])/[2]))

y：　 ADC pulse height

x： rotation number of polarizing plate　　　　（ ×４．５ °）

Shape is sure to fall into disorder if mppc is a saturated condition.

The measuring method of the response curve is established.

PMTMPPC

responsecurve

Newsetup

3%penetration

10 　↓　　　 14.5

Laser controller

HVcurve

PMT HV（ V）

PMTADCcounts

[0]*pow(x,[1])

Angle dependence in polarizing plate to laser

• y：　 ADC pulse height• x： rotation number of polarizing plate（ ×４．５ °）

A flat area is seen in mppc plot. The saturated condition was able to be confirmed.

MPPC

PMT

５１Response curve

ADC counts

Mppcp.e.

plan

• Evaluation of reproducibility by the same sample.1, Reproducibility of polarizing plate and laser.2, Reproducibility when mppc is pulled out and

opened.….

Back up

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