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