( 1- exp (- p1 *x /p0 ))

Saturation of MPPC detector
ILC meeting
2010/11/11
M2
Hiroko Koike
1
Gain
•
Over +3V=72.44V
Gain (over +3V)=3.5
×105
ｄのグラフとgainのグラフ
72.4V
d=13.7 counts
The value of
gain is given
as a parameter
in the program.
d S
Gain 
e A
d ( ADCcounts)
p.e 
d'
'
d=14.1 counts
2
Plan（last time）
A receiving optical side was expanded more
than before.
MPPC
PMT
12mm
GATE
The setup has not
changed.
3
3
When quantities of light are the maximum
MPPC
MPPC
pedestal
signal
？
PMT
pedestal
PMT
signal
4
4
response curve(last time)
MPPC
p.e.
Fit function (the most simple function)
： p0*( 1- exp (- p1 *x /p0 ))
p0
: All numbers of expiration pixel
p1
: Response ratio
Accuracy of a
fit is not good.
PMT ADC
counts
5
To solve theses problems..
MPPC
PMT
GATE
The fiber was concealed.
MPPC
PMT
Above figure : quantities of
light are the maximum.
Under figure :quantities of
light are the maximum.
GATE
6
When quantities of light are the maximum
MPPC
MPPC
pedestal
signal
PMT
PMT
signal
pedestal
7
When quantities of light are the minimum
MPPC
MPPC
pedestal
signal
PMT
pedestal
PMT
signal
8
8
Angle dependence of polarizing plate to laser
MPPC
PMT
y： ADC pulse height
x：rotation step of polarizer (°)
Shape of MPPC looks like obviously thinner than PMT .
9
response curve(this time)
MPPC
p.e.
Fit function (the most simple function)
： p0*( 1- exp (- p1 *x /p0 ))
p0
: All numbers of expiration pixel
p1
: Response ratio
PMT ADC
counts
10
Fit function(crosstalk ,afterpulse)
MPPC
p.e.
MPPC
p.e.
PMT ADC counts
Fit function (effect of crosstalk is additional )
： p0*( 1- exp (- p1 *x /p0 ))* ( 1+p2*exp (- p1 *x /p0 ))
p0
: All numbers of expiration pixel
p1
: Response ratio
p2
: cross talk probability
PMT ADC counts
Fit function (effect of crosstalk and afterpulse is
additional )
： p0*( 1- exp (- p1 *x /p0 ))* ( 1+p2*exp (- p1 *x /p0 ))
*(1+p3)
p0
: All numbers of expiration pixel
p1
: Response ratio
p2
: cross talk probability
p3
: after pulse
11
• Back up
12
MPPC応答曲線
(生野先輩 2009/02/03 ILC meeting より引用)
13
MPPC応答曲線
(生野先輩 2009/02/03 ILC meeting より引用)
Npix=2424 ± 3 と求まった。
14
問題点２について
(生野先輩 2009/0１/23 ILC meeting より引用)
Laser+シンチレータのシステムテスト（まだ光量変えられない）
テスト@筑波大
MPP
C
Inside
ビームテストと
同じストリップ
紫外光
レーザー
ファイバー
直接
シンチの光
15
16
Measuring imitative chart
MPPC単体
MPPC＋
scintillator
30mm
20mm
17
前回
To bring the distance of the scintillator and the polarizing
plate, the fiber was lengthened.
MPPC
side
PMT side
18
Setup
The fiber was extended.
10mm
180mm
MPPC
PMT
GATE
Signal of PMT and MPPC
When seeing with the oscilloscope
19
When quantities of light are the minimum(前回)
MPPC
MPPC
pedestal
signal
PMT
PMT
pedestal
signal
20
20
Angle dependence of polarizing plate to laser
PMT
MPPC
y： ADC pulse height
x：rotation step of polarizer (°)
Shape of MPPC looks obviously thinner
than PMT .
21
Response Curve（前々回）
MPPC
p.e.
Fit function (the most simple function)
： p0*( 1- exp (- p1 *x /p0 ))
p0
: All numbers of expiration pixel
p1
: Response ratio
PMT ADC
counts
22

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