11 saturation of mppc detector detector meeting 2010/11/18 m2 hiroko koike 090203_ikuno.ppt
TRANSCRIPT
11
Saturation of MPPC detector
Detector meeting2010/11/18
M2Hiroko Koike
090203_ikuno.ppt
2
To solve theses problems..
MPPC
PMT
GATE
MPPC
PMT
GATEAbove figure : quantities of light are the maximum.
Under figure :quantities of light are the maximum.
The fiber was concealed.
gate
オシロスコープ
3
80nsec
60nsec
160nsec
120nsec
Response curve
4
赤・・・ 200nsec黄緑・・・ 160nsec青・・・ 120nsec黄色・・・ 80nsecピンク・・・ 60nsec
PMT ADC counts
MPPCp.e.
Response curve(gate=80nsec)
5
PMT ADC counts
MPPCp.e.
Fit function (the most simple function): p0*( 1- exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio
Response curveQuotation from master's thesis of ikuno
My result of measurement is
p0=3087
P1=16.51
Fit function(crosstalk )gate=80nsec
7
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
Fit function (effect of crosstalk is additional ): p0*( 1- exp (- p1 *x /p0 ))* ( 1+0.07252*exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio p2 : cross talk probability
MPPCp.e.
MPPCp.e.
PMT ADC counts PMT ADC counts
Fit function(crosstalk and after pulse )gate=80nsec
8
MPPCp.e. MPPC
p.e.
PMT ADC countsPMT 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
Fit function (effect of crosstalk and afterpulse is additional ): p0*( 1- exp (- p1 *x /p0 ))* ( 1+0.07252*exp (- p1 *x /p0 )) *(1+0.03) p0 : All numbers of expiration pixel p1 : Response ratio p2 : cross talk probability p3 : after pulse
plan• Improvement of the fit function About measurement of response curve of source
of light with laser+ scinti + WLS• Evaluation of evaluation • individual difference of reproducibility・・・・ Match of fiber and scintillator /// I want to finish taking it by the end of this
year. • Evaluation of responsiveness curve by simulation
・・・ making it now.9
1010
• Back up
1111
Plan ( last time )A receiving optical side was expanded more
than before.
12mm
MPPC
PMT
GATE
The setup has not changed.
12
When quantities of light are the maximum
MPPC
signal
MPPC
pedestal
PMT
signal
PMT
pedestal
13
When quantities of light are the minimum
MPPC
signal
PMT
signal
MPPC
pedestal
PMT
pedestal
13
14
Angle dependence of polarizing plate to laser
y : ADC pulse heightx : rotation step of polarizer (°)
Shape of MPPC looks like obviously thinner than PMT .
MPPCPMT
response curve
15
PMT ADC counts
MPPCp.e.
Fit function (the most simple function): p0*( 1- exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio
16
Fit function(crosstalk )
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 PMT ADC counts
MPPCp.e.
MPPCp.e.
Fit function (effect of crosstalk is additional ): p0*( 1- exp (- p1 *x /p0 ))* ( 1+0.07252*exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio p2 : cross talk probability
Crosstalk and after pulse
17
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
Fit function (effect of crosstalk and afterpulse is additional ): p0*( 1- exp (- p1 *x /p0 ))* ( 1+0.07252*exp (- p1 *x /p0 )) *(1+0.03) p0 : All numbers of expiration pixel p1 : Response ratio p2 : cross talk probability p3 : after pulse
MPPCp.e.
MPPCp.e.
PMT ADC counts PMT ADC counts
18
Angle dependence of polarizing plate to laserGate(200nsec)
y : ADC pulse heightx : rotation step of polarizer (°)
Shape of MPPC looks like obviously thinner than PMT .
MPPCPMT
Gate(160nsec)
19
PMTMPPC
Gate(120nsec)
20
PMTMPPC
Gate(80nsec)
21
PMT MPPC
Gate(60nsec)
22
MPPCPMT
Response curve(gate=160nsec)
23
Response curve(gate=120nsec)
24
Response curve(gate=60nsec)
25
• Backup 前々回
26
2727
Gain• dのグラフと gain のグラフ
Over +3V=72.44VGain (over +3V)=3.5 ×105
d=13.7 counts
d=14.1 counts
72.4V
'
'
)(.
d
ADCcountsdep
Ae
SdGain
The value of gain is given as a parameter in the program.
2828
When quantities of light are the maximum
MPPC
signal
PMT
signal
PMT
pedestal
MPPC
pedestal
?
2929
response curve(last time)
Fit function (the most simple function): p0*( 1- exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio
PMT ADC counts
MPPCp.e. Accuracy of a
fit is not good.
3030
MPPC 応答曲線 ( 生野先輩 2009/02/03 ILC meeting より引用 )
3131
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。
3232
問題点2について ( 生野先輩 2009/0 1 /23 ILC meeting より引用 )
テスト @ 筑波大
シンチの光ファイバー
直接紫外光
レーザー
MPPC
Inside
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)
ビームテストと同じストリップ
3333
3434
Measuring imitative chartMPPC 単体
20mm
MPPC +scintillator
30mm
3535
前回
PMT side
To bring the distance of the scintillator and the polarizing plate, the fiber was lengthened.
MPPC
side
3636
Setup
180mm10mm
MPPC
PMT
GATE
Signal of PMT and MPPCWhen seeing with the oscilloscope
The fiber was extended.
37 37
When quantities of light are the minimum( 前回 )
MPPC
signal
MPPC
pedestal
PMT
pedestal
PMT
signal
3838
Angle dependence of polarizing plate to laser
PMT MPPC
y : ADC pulse heightx : rotation step of polarizer (°)Shape of MPPC looks obviously thinner than PMT .
3939
Response Curve (前々回)
Fit function (the most simple function): p0*( 1- exp (- p1 *x /p0 )) p0 : All numbers of expiration pixel p1 : Response ratio
PMT ADC counts
MPPCp.e.