veto counter test hyupwoo lee 2007/06/18. setup – cable length test 2 scope setup - recall...
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Veto Counter test
Hyupwoo Lee2007/06/18
Setup – cable length test 2• scope setup - recall Cable_Length.SET using
floppy disk • Section # -> C02, C08, C14 • HV -> 1600V• # of events averaged-> 256 • Pannel #10 • PMT -> PMT77 Thorn • signal cable length for big pannel varies 323cm
(x1, x2, x3) • File names in compressed zip file i.e. p10_1_h16_C02_e256_x1.xls -> p(pannel#)_(PMT)_h(HV
in 100V)_s(section#)_e(# of events averaged)_x(# of connected calbles for big pannel's signal).xls
Cable length Test
• As cable goes longer, signals are distorted a little, but it seems OK.
• As timing, shifting the signal is roughly matched with cable delay(5.5ns/m)
• Roughly small signal shows the same feature only but amplitude
Signals vs. timeSection# : C08
- 14.000
- 12.000
- 10.000
- 8.000
- 6.000
- 4.000
- 2.000
0.000
2.000
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Volta
ge(
mV)
x1x2x3
Section# : C02
- 40.000
- 35.000
- 30.000
- 25.000
- 20.000
- 15.000
- 10.000
- 5.000
0.000
5.000
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Vo
ltag
e(m
V)
x1
x2x3
Section# : C14
- 4.500
- 4.000
- 3.500
- 3.000
- 2.500
- 2.000
- 1.500
- 1.000
- 0.500
0.000
0.500
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Vo
ltag
e(m
V)
x1x2x3
About position
Cable length x1
- 40.000
- 35.000
- 30.000
- 25.000
- 20.000
- 15.000
- 10.000
- 5.000
0.000
5.000
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Vo
ltag
e(m
V)
C14
C08
C02
Cable length x2
- 40.000
- 35.000
- 30.000
- 25.000
- 20.000
- 15.000
- 10.000
- 5.000
0.000
5.000
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Volta
ge(
mV
)
C14C08C02
Cable length x3
- 35.000
- 30.000
- 25.000
- 20.000
- 15.000
- 10.000
- 5.000
0.000
5.000
- 200.0 - 150.0 - 100.0 - 50.0 0.0 50.0 100.0
Time(ns)
Volta
ge(
mV)
C14C08C02
Peak amplitude vs. sections Total charge vs. sections
Peak
- 40
- 35
- 30
- 25
- 20
- 15
- 10
- 5
00 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Volta
ge
(mV)
C14C08C02
Total charge of s ignal
0
5
10
15
20
25
30
35
0 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Cha
rge
(pC
)
C14
C08
C02
Time characteristicPeak width (C08)
0
10
20
30
40
50
60
70
80
90
0 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Pea
k w
idth
(ns
)
10%
30%50%70%
Timing (C02)
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Volta
ge
(mV)
10% peak10% charge200fC
Timing (C08)
0
10
20
30
40
50
60
70
80
90
0 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Volta
ge
(mV)
10% peak10% charge200fC
Timing (C14)
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3 3.5
Cable length(x323cm)
Volta
ge
(mV)
10% peak10% charge200fC
Setup – Timing test 1
• scope setup - recall timing.SET using floppy disk • Section varies C02, C08, C14 (#8 at center and #1 is the nearest se
ction to tested PMT) • HV -> 1600V• # of events for one data -> 1 • Pannel #10 • PMT -> PMT77 Thorn • signal cable length for big pannel -> 323cm • File names in compressed zip file i.e. p10_1_h16_s02_e32.xls -> p(pan
nel#)_(PMT)_h(HV in 100V)_(section#)_s(sample #).xls• 2 different DAQ method
- Taking waveform from scope (25 samples for each section)determine the timing 3 ways(slide #11).
- Using math func. in scope (80 samples for each section)
Timing Test
• Standard deviation of timing(signal’s falling edge to trigger’s falling edge) is ~10ns
• Signals are delayed by the length between hit position and PMT.
Problem with scope math func.
Timing
C02 C08 C14ave 75.936 64.548 65.928std 9.460923 9.226643 10.86476ave 75.85625 66.86088 55.73316std 9.621555 11.59667 14.60623
cable test ave 88.2 81 92.8
Timing - 10% peak (ns)
waveform
scope cal.
C02 C08 C14ave 70.712 61.964 53.416std 9.457463 10.13044 9.473282
cable test ave 77.2 70 68.6
Timing - 10% charge (ns)
waveform
C02 C08 C14ave 76.368 65.028 52.248std 8.921637 12.35993 9.2787
cable test ave 89 78 76.6
Timing - 200fC (ns)
waveform
1. 10% Peak – From 10% of signal’s minimum V to trigger signal
2. 10% Charge – From where accumulated charge reaches 10% of signal’s total charge to trigger signal
3. 200fC – From where accumulated charge reaches 200fC to trigger signal
Timing vs. Section
Timing vs. section
40
45
50
55
60
65
70
75
80
0 5 10 15
Section #C{}
Tim
e in
terv
al (
ns)
Scope func10% Peak10% Charge200fC
Plan for Future
• Take data with both PMTs(Add two signals from both PMTs)
• Measure the white noise level in various circumstances(w/ filter or attenuator)?
• FEB test for veto wall