December 14 Lab setup 972011 TAU status report 2 Each RO line is X100 Attenuated and 100 Ω terminated 10 μ m position precision of collimated source Discriminator 10 RO lines VME V560 ID: 419798
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Slide1
TAU - status
December 14Slide2
Lab setup
9/7/2011
TAU - status report
2
Each RO line is X100 Attenuated and 100
Ω
terminated
10
μ
m position precision of collimated source
Discriminator
10 RO lines
VME V560
counter
HV line quenched with 20M
Ω
connected to a
1M
Ω
/100M
Ω
voltage dividerSlide3
Source position
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3
Source sits here
1cm thick,
Delrin
collimator, with a 3 mm slit opening Slide4
All night measurement
collimated Source was left on the same position (above RO channel 7) for ~14 hours.
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TAU - status report
4Slide5
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5
Each histogram shows the ratio between each channel and the channel beneath the source (7).
hour
ratio
1
2
3
4
5
6
7
8910Slide6
Position scan
Each full turn of the micrometer moves the source by 1mm
Started the scan when the micrometer read is 60mm
Made 16 measurements each of 5minutes and 1mm apart.
CF4 gas, 600 Torr, 1316V .
Actual voltage on the panel is ~4/5 of the HV applied due to the voltage divider.
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TAU - status report
6Slide7
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TAU - status report
7
49mm
50mm
51mm
52mm
53mm
54mm
55mm
56mm
60mm
59mm
58mm
57mm
cpmChannel Slide8
Source position measurement
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8
points in this graph are the
Gaussian
fit results
E
rrors are
σ
/
√
(n-1)
Numbers in the x-axis have no global meaning, simply the read of the micrometer and not the distance from any real point in space…The electrode pitch in this panel (10 electrodes per inch) is the slope of this line: 0.4 electrodes per mm…Slide9
XY signal processing
Measuring the pulse as a function of
HV line
number.
RO
85
24
105
55
Volts
Time
Panel
HV Slide10
HV line
Area
Width at bottom
Width at 60%
Maximum
24
46.777 bins21 bins
1.365551.575 bins
33 bins 1.28547.7
80 bins64 bins 0.995105
48.382 bins57 bins
1.05
XY signal processing Cutting out the noise. Flipping the signal to the positive side. Trying to discriminate between the two pulses (table above).None of the quantities
above seems to give good separation between the two pulses. Slide11
Last minute plots …
Seems that the r/o pulse can be parameterized according an electric damped oscillator
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11Slide12
r/o pulse fit
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12
If we supposed R=100 ohms, the fit results gives
C=15pFSlide13
Future plans
Measuring the signal at stripe #1, we expect to get the signal shape with a factor 2. This should include the negative side of the bi-polar signal.
Fitting the two pulses with the shape extracted from the above measurement. Allowing the location of the two signals to float.