Calorimeter Meeting22 October 02

Stephanie BeauceronLPNHE - Paris

1

Attempts on:Response dependence on

temperature

Stephanie BeauceronLPNHE - Paris

• The aim : study if the signal from preamp could change if we are at high temperature

Calorimeter Meeting22 October 02

Stephanie BeauceronLPNHE - Paris

2

The reason of this studyThe preamp 7 board got high tempreature due to a broken fan.Before repairing the fan, preamp board 7 was cool down and after some time was turn on (so temperature increased).In the same time that the temperature increased, some linearity ramps had been taken (pulsing at different DAC value). And the temperature was recorded each 10 minutes (logbook). Compare the different linearity ramps and see if we can see an effect from temperature increasing…

3

Pb in linearity ramp…These linearity ramps do not look like old linearity ramp…Find a pb:

50 48 5000 21 1 1 0 .34. 3. 1148 ...... idac 1 ipat 0 indac 43 50 49 5000 21 1 1 0 .143. 3. 1150 ...... idac 1 ipat 0 indac 4450 49 5000 21 1 1 0 .22. 3. 1152 ...... idac 1 ipat 0 indac 45 ...... idac 1 ipat 0 indac 45 write clear 50 0 5000 21 2 1 0 .90. 3. 1159 ...... idac 2 ipat 0 indac 1 50 2 5000 21 2 1 0 .28. 3. 1148 ...... idac 2 ipat 0 indac 2 50 5 5000 21 2 1 0 .125. 3. 1146 ...... idac 2 ipat 0 indac 3 50 5 5000 21 2 1 0 .34. 3. 1148 ...... idac 2 ipat 0 indac 4 50 5 5000 21 2 1 0 .25. 3. 1153 ...... idac 2 ipat 0 indac 5 50 5 5000 21 2 1 0 .134. 3. 1157 ...... idac 2 ipat 0 indac 6 50 10 5000 21 2 1 0 .72. 3. 2393 ...... idac 2 ipat 0 indac 7 50 10 5000 21 2 1 0 .140. 3. 2381...... idac 2 ipat 0 indac 8

Value of the step where the event is.

ADC count for the event and the channel

This ADC counts correspond to the previous step but are flagged with the second step!!!Real second step

Events mixing with steps… No possibility to have a right linearity ramp.Due to multibuffer mode…

Calorimeter Meeting22 October 02

Stephanie BeauceronLPNHE - Paris

4

A offline correction (skip the first 100 events) has been done but…

Before looking at the linearity ramp versus temperature, 2 ramps in same condition of temperature with just 10 minutes between each other as been studied…

In 10 minutes we have a variation of 40 ADC counts for some steps!!!

A solution…

Ramp(t=10)-Ramp(t=0min)

Calorimeter Meeting22 October 02

Stephanie BeauceronLPNHE - Paris

5

Not so good ramp

mean 19.1089 step 0 sigma 1.84479 mean 1131.98 step 1 sigma 2.69118 mean 2300.62 step 2 sigma 2.73894 mean 3191.57 step 3 sigma 20.0396 mean 4293.39 step 4 sigma 23.2599 mean 5411.55 step 5 sigma 26.1396 mean 6510.29 step 6 sigma 28.3669 mean 7628.15 step 7 sigma 31.1041 mean 8737.68 step 8 sigma 33.1851 mean 9835.58 step 9 sigma 35.2045 mean 10966.2 step 10 sigma 37.0802 mean 12101.4 step 11 sigma 39.0481 mean 13232.3 step 12 sigma 40.5281 mean 14200.4 step 13 sigma 46.6584 mean 15441.3 step 14 sigma 43.7726 mean 16500.8 step 15 sigma 45.5983

mean 13.5859 step 0 sigma 2.04102 mean 1124.75 step 1 sigma 2.57733 mean 2286.63 step 2 sigma 2.69681 mean 3149.62 step 3 sigma 20.6788 mean 4269.93 step 4 sigma 23.045 mean 5403.91 step 5 sigma 22.3354 mean 6579.99 step 6 sigma 6.12305 mean 7690.58 step 7 sigma 5.1218 mean 8846.05 step 8 sigma 5.91325 mean 9973.65 step 9 sigma 5.70964 mean 11107.7 step 10 sigma 4.76584 mean 12265.8 step 11 sigma 5.38485 mean 13432.5 step 12 sigma 5.97559 mean 14557.9 step 13 sigma 7.71184 mean 15615.8 step 14 sigma 7.52751 mean 16754.3 step 15 sigma 7.78859

Ramp 10 minutes later

Some differences

Too high sigma values

6

Impossible to have any conclusion…

~100 ADC Counts temperature increase of 10 degrees in 1h30…

Calorimeter Meeting22 October 02

Stephanie BeauceronLPNHE - Paris

7

Huge variation of temperature with time…

From logbook 10 degrees in 10 minutes!!!And a ramp requires 10 minutes to be done…

Can we really look at the temperature influences on signal?