====== Mesure sur le detecteur PCB fin au CERN ======

 --- //[[laurent.mirabito@gmail.com|DAQ user]] 2017/12/08 16:27//

===== Resume  =====

On a d'abord travaille la mise a la masse pour diminuer le bruit. On arrive a une situation a peu pres correcte (HV 100V)


Quand on teste l'injection on a des resultats bizarres du a des problemes sur le circuit d'injection


On teste l'injection 5 pC sur une piste + scope ===> Defaut d'adaptation !!!!!!


On retrouve les ratios du PCB epais:


  * Cote injection 47.2
  * Cote oppose 31.7

Recopier ici le plot du scope

On arrete les mesures d'injection car le circuit d'injection est plein de faux contacts

===== Mesure de l'impedance au capacimetre =====

2 MHz

  * Open

Cp= 172 pF

Gp=  960 microS

   * Closed

Ls= 550 nH 

Rs= 530 mOhm


__**DONC 56 Ohm d'impedance caracteristique
**__

===== Mesure de signaux =====

On ne pût pas faire de mesure d'injection vendredi dernier

Apres un piedestal je corrigeai le DAC6B canal 10 => State FE2_24CH_4


Il faut donc désormais exécuter 

<code bash>
 daqcontrol --daq-downloaddb --dbstate=FE2_24CH_4
 daqcontrol --daq-configure

</code>
 dans le script //startnorm// qui se trouve sur ///home/acqilc// sur lyosdhcal10


<code bash >
daqcontrol --daq-downloaddb --dbstate=FE2_24CH_4
daqcontrol --daq-configure
daqcontrol --trig-spillof --clock=20000
daqcontrol --trig-spillon --clock=200000
daqcontrol --daq-setvth --vth=507
daqcontrol --trig-spillreg --value=4

</code>



Un run de pedestal avec 20 V sur les gap est le 738730


On doit pouvoir descendre le seuil a 505 sur ce FE#2

 --- //[[laurent.mirabito@gmail.com|DAQ user]] 2017/12/12 14:12//

Gas is Ok

==== HV ramp ====

Roughly 550 muon per hour

^ HV top ^ I top ^ HV bot ^ I Bot ^ run ^ Noise obs. ^ N trg ^ N seen ^ N 2 side ^ Eff ^ dEff ^ Eff_Y ^ dEff_Y^
|3000|0.06|3000|0.11|
|4000|0.09|3000|0.15| 738731 |370 hits during 64 seconds|
|5000|0.11|5000|0.14| 738732| 6700 hits during 90 seconds|
|6000|0.18|6000|0.14| 738733 |28182 hits during 90 seconds|
|7000|0.45|7000|0.21| 738734 | ~ 1 Hz/cm2 |118|90|4|76.27| 3.92| 3.39| 1.67|
|7000|0.35|7000|0.18| 738736 | ~ 1 Hz/cm2 |95|73|1|76.84| 4.33| 1.05| 1.05|
|7200|0.43|7200|0.21| 738737 | ~ 1.6 Hz/cm2 |272|218|17|80.15| 2.42| 6.25| 1.47|
|7400|0.48|7400|0.21| 738738 |~ 2.4 Hz/cm2 |286|230|48|80.42| 2.35|16.78| 2.21|
|7600|0.59|7600|0.27| 738739 |~ 3.6 Hz/cm2 |288|240|92|83.33| 2.20|31.94| 2.75|

Weird TDC profile for noise 

{{ :cern_dec_2017:run738739_allstrips.png |}}

Did we break something on Friday? No reason to have so few signal on half of the strips for noise.

''**!!! The efficient side is the OPPOSITE side to the trigger !!!
**''

Start real scan 2 h data taking with steps of 200 V from 7600 to 6400 V

|738740|7600|73|63|27|86.30| 4.02|36.99| 5.65|


 --- //[[laurent.mirabito@gmail.com|DAQ user]] 2017/12/12 18:24//

lyosdhcal10 is not reachable anymore . No idea what's going on


 --- //[[laurent.mirabito@gmail.com|DAQ user]] 2017/12/12 19:08//

Elena checked all the connection. Once FEB is replugged we got equivalent noise on all strips and the efficiency changed. I do not expect to have 80 % efficiency on both side at 7 kV because since the strips were most  probably unconnected on the narrow side the charge seen on the other side was double....

Small runs of 900 s

|738745|7600|126|112|101|88.89| 2.80|80.16| 3.55| 
|738746|7000|118|99|74|83.90| 3.38|62.71| 4.45|

Run of 7200 s

^Run ^ HV ^ N trg ^ N seen ^ N 2 side ^ Eff ^ dEff ^ Eff_Y ^ dEff_Y^
|738747|6600|1077|408|265|37.88| 1.48|24.61| 1.31|
|738748|6800|1136|778|604|68.49| 1.38|53.17| 1.48| 
|738749|7000|1137|925|771|81.35| 1.16|67.81| 1.39| 
|738753|7100|1066|890|742|83.49| 1.14|69.61| 1.41|
|738750|7200|1098|948|833|86.34| 1.04|75.87| 1.29|
|738754|7300|1157|1008|874|87.12| 0.98|75.54| 1.26|
|738751|7400|1138|1023|902|89.89| 0.89|79.26| 1.20|
|738755|7500|1087|966|860|88.87| 0.95|79.12| 1.23|



{{ :cern_dec_2017:efficiency_scan12dec.png |}}


=== Test with 505 threshold ===

 --- //[[laurent.mirabito@gmail.com|DAQ user]] 2017/12/13 11:20//

|738752|700|452|372|296|82.30| 1.80|65.49| 2.24|

No significant effect

now our gas:

  *  iC4H10 = 4.92%, 
  * DP = 3.3degC - in gas rack; 
  * in lab 904 T=23.1 degC 
  * P=965 hPa; 
  * gas flow: 2.5 l/hr; 
  * frequency of bubbles: BOT=2.6 Hz, 
  * TOP = 1.1. Hz


$$ HV_{app}= HV_{eff} \times ( (1-\alpha)+\alpha \times \frac{P}{P0} \frac{T0}{T}) $$

with
$\alpha$ =0.8 , P0=990 mbar T0=293K

<imgcaption cern_eff_hveff| Efficiency curve from previous runs in function of effective HV. Blue is trip efficiency, orange (X,Y) efficiency >
{{ :cern_dec_2017:efficiency_scan12dec_hveff.png |}}
</imgcaption>

===== New analysis =====
==== Efficiency studies ====

^Run ^ HV applied ^ HV eff ^  N trigger ^ N strip ^ N 2 Strip ^ $\epsilon$ (%) ^ d$\epsilon$ ^$\epsilon_2$ (%) ^ d$\epsilon_2$ ^ <$\Delta T $> ^ $\sigma \Delta T$ ^
|738747|6600|6832|1077|405|263|37.60| 1.48|24.42| 1.31|-0.59|0.653|
|738748|6800|7039|1136|777|603|68.40| 1.38|53.08| 1.48|-0.28|0.583|
|738749|7000|7246|1137|924|770|81.27| 1.16|67.72| 1.39|-0.09|0.601|
|738750|7200|7453|1098|943|830|85.88| 1.05|75.59| 1.30| 0.01|0.618|
|738751|7400|7660|1138|1015|901|89.19| 0.92|79.17| 1.20| 0.00|0.632|
|738753|7100|7349|1066|890|742|83.49| 1.14|69.61| 1.41|-0.03|0.619|
|738754|7300|7556|1157|1010|874|87.29| 0.98|75.54| 1.26| 0.05|0.648|
|738755|7500|7763|1087|969|860|89.14| 0.94|79.12| 1.23| 0.05|0.724|



<imgcaption cern_eff_hveffn| Efficiency curve from previous runs in function of effective HV. Blue is strip efficiency, yellow (X,Y) efficiency >
{{ :cern_dec_2017:scan_cern_newananlys.png |}}
</imgcaption>

==== Measured distance at different HV applied====
<imgcaption cern_dt_6600| Delta T 6600 V >
{{ :cern_dec_2017:run738747_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_6800| Delta T 6800 V >
{{ :cern_dec_2017:run738748_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7000| Delta T 7000 V >
{{ :cern_dec_2017:run738749_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7100| Delta T 7100 V >
{{ :cern_dec_2017:run738753_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7200| Delta T 7200 V >
{{ :cern_dec_2017:run738750_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7300| Delta T 7300 V >
{{ :cern_dec_2017:run738754_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7400| Delta T 7400 V >
{{ :cern_dec_2017:run738751_strip_pos.png |}}
</imgcaption>

<imgcaption cern_dt_7500| Delta T 7500 V >
{{ :cern_dec_2017:run738755_strip_pos.png |}}
</imgcaption>