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TAU - status
TAU - status

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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

9/7/2011

TAU - status report

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.

9/7/2011

TAU - status report

4Slide5

9/7/2011

TAU - status report

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.

9/7/2011

TAU - status report

6Slide7

9/7/2011

TAU - status report

7

49mm

50mm

51mm

52mm

53mm

54mm

55mm

56mm

60mm

59mm

58mm

57mm

cpmChannel Slide8

Source position measurement

9/7/2011

TAU - status report

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

9/7/2011

TAU - status report

11Slide12

r/o pulse fit

9/7/2011

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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.

By: lindy-dunigan
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TAU - status - Description


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 Download Presentation

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