UM PPS Lab Activities
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UM PPS Lab Activities

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UM PPS Lab Activities




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Presentation on theme: "UM PPS Lab Activities"— Presentation transcript:

Slide1

UM PPS Lab ActivitiesMid-size Panel Tests

PPS meeting January 15, 2012

Claudio, Curtis, Dan, Ethan, Riley

Slide2

MP1 Tests

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Panel re-baked over night at 100⁰C

nd

filled with 90%Ar 10%CF

4

at 600

Torr

December 18, 2012.

13 HV lines at 100M

Ω

+ 20 RO lines (attenuation~9.4), discriminated at -150mV, to the Wiener 20 channels counter

(the other 4 lines of the RO card are masked)

Three types of test:

Voltage Scan, with/without Source at fixed R-quench

Position Scan: (un)collimated source moved across RO lines

Uniformity: un-collimated source at 19 cm above the panel

uniform spray of betas over the instrumented region

Remember: This panel is Ni-SnO

2

with line pitch 1mm, with the high numbered channels toward R-quench

Slide3

Initial Voltage Scans

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Top two plot scans with lights ON

- left HV always ON

- right 1’ off before run

The panel is light sensitive!From next test on, all runs undera cardboard boxAt 880V Rate(Bkg)~Rate(Src)!

Working

Region

Slide4

Uniformity Scan – Many Voltages

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The two position are different by 10 mm toward the low numbered channels

RESULT#1) Very Low background

RESULT#2) Hit map substantially flat

RESULT#3) Rate scale with Voltage (if the bkg remains low!)RESULT#4) The rate on the second scan is much lower at 870V

865V data bad

(to be fixed!)

Slide5

Uniformity Scan – 3 Positions

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Pos2= Pos1 + 5 mm

Pos 3= Pos1 - 5 mm

In all cases, there is an increases for channel #1 and for the higher

numbered channels (#19 is less responsive of the nearby ones)

Slide6

Position Scan Un-collimated

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Gaussian fit ±8 bins around the max

(First 3 runs eliminated, fit too poor at the edge)

Source moved by 2mm/run

Slide7

Position Scan Un-collimated Results

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As in the Uniformity Scan, the

number of event for higher

numbered channel is larger

Slope = 1/pitch

Fit result not

compatible with

the hardware

value 1

mm

Slide8

Long Uniformity Scan

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This hit map gives channel by channel response

correct ion factors respect to uniform distribution

Slide9

Channel Response

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Relevant -20% +25%, with a few jumps between nearby channels!

Slide10

Hourly Hit Map

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Limited difference

It seems stable

Slide11

Normalized Hourly Hit Map

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Slide12

Uniformity in Time

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Is the performance (hit rate) of the panel constant in time?

The quadratic fit works better

 the hit rate is not constant,

it decreases in time!

Is this a measurement of the

panel (SnO

2

) degradation or

is it just an initial effect

?

Slide13

Hourly Rate

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The rate decrease doesnot seems to stabilize Later as in the first test

Weekend long run

Slide14

Hourly Channel Rate

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Analysis in progress: it will be interesting to see if the decrease rate trend

is the same for all the channels or higher for the more responsive

Slide15

Hourly Correction Variation

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Slide16

Position Scan Collimated

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Movement every 1 mm

New fit function Gaussian + Linear over then whole range

A few runs eliminated

(edge effect)

Slide17

Fit of the Mean Fit

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The quadratic fit has a better reduced

χ

2

than the simple linear function and the slope is close to 1. But why ?

Not OK

Slide18

Fine Position Scan Collimated

72 runs with source moved by 0.25 mm each time

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The correction makes

the peak amplitude

more stable!

Before and after correcting

channel by channel the hit maps

Slide19

Lin Vs Quad Fit of the Mean Fit

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Once more the quadratic fit has a much better

χ

2/#dof than the linear function

In both cases the slope is far from 1

by many time the error on the fit

Slide20

Lin Vs Quad Fit of the Mean Fit (2)

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Now the pure linear function fits better the data, but the slope is still far from the unity

Now the quadratic function fits quite well the data, and the slope is not too far from the unity.

Slide21

Conclusions

A lot of new data on the Mid-size panel. It responded very nicely!Significant photo-sensitivity forced us to cover the panelVoltage Scan: with 90%Ar 10%CF4 at 600 Torr and quench resistor 100 MΩ the working region is limited around 860VUniformity Scan: MP1 has channel by channel different response  correction deduced from a long runLong Uniformity Scan: the acquisition rate is not exactly linear, but it tends to slowly decrease in time. The very long run over the weekend will allow to better check rate (and corrections) stabilityPosition Scans: thanks to the corrections the data seems better, but the correlation of the source Vs reconstructed position seems to be more slightly quadratic than linear. Even with small source movements we were not able to see the inter-strip spaces (drop in the acquisition rate, broader peak distribution ...). We have also a new position scan at 870V to be analyzed to see any voltage effectWe have more results than what has been presented here . . .

January 15, 2013

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Slide22

Conclusion (2)

Ethan & Riley contributed on taking the scan runsCabinet with doors to shield the Ni-SnO2 panels from the lights is ready to be installedProgress on the gas mixing station leak fixing and on starting our gas chromatography (Curtis and Riley)The CAEN DT5472 default software is only an example of DAQ, we need to invest time/effort to have a solid code for taking data

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