ELOG DESPEC

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

DESPEC

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Thu Jan 9 12:46:43 2025

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						<p>https://elog.gsi.de/despec/Implantation+Stack/9?suppress=1 - Day 1 ELOG</p>

<p>10:14 we set up the detector with the pulser in BB7 and started biasing the detector and setting up the DAQ. Water flow and temperature check, OK. 677/1 677/2 677/3</p>

<p>FEE temps OK. Screenshots included for LOCAL controls for aida07, Discriminator for aida07, ASIC control for aida01 ASIC # 1,2,3,4 and the pulser setting - 1 V @ 10 Hz rep. 677/4 677/5 677/6 677/7 677/8 677/9</p>

<p>ASIC thresholds for the fast comparator LEC/MEC set to 0x20 for all the ASICs in aida10 - connected to BB7. Act on all ASICs did not work with this so each threshold was set to 0x20 on each ASIC by hand.</p>

<p>The pulser is now connected to BB7 test + and via a T-connector to the scope, triggering on the pulser signal. We saw now signals --&gt; lower the threshold of the fast comparator to 1 MeV - 0x64 on all ASICs in aida10. 677/10</p>

<p>No signal was observed, threshold was then set to 0x190 (400 keV) 677/11</p>

<p>13:00 We resumed after lunch. It seems that our thresholds were way too high for starters each channel was actually 100 keV in HEX. We then set the thresholds in aida10 to 0x32, 0x20, 0x20, 0x11 for ASIC 1,2,3,4, respectively. This was to achieve a 10 Hz hit rate in all of the channels! This was done successfully see 677/12 for the hit rate spectrum and also 677/13-16 for the thresholds.</p>

<p>The pulser was set to 0.5 V to test if we can still see the time spectrum between AIDA and bPlast with reduced thresholds -- mimicking a beta event.</p>

<p>These thresholds were changes from 0x32, 0x20, 0x20, 0x11 for ASIC 1,2,3,4 ---&gt; 0x10, 0x10, 0x0d, 0x10.</p>

<p>This was set to have the HitRate in aida10 to be just above the noise.</p>
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<p>Initial results: copy from DESPEC elog.</p>

<pre>
We have managed to obtain the time difference between the bPlast White rabbit and the AIDA Fast time. We had to gate out the zero fast-time events and then also condition that we only take the data from aida10. We see this in <a href="https://elog.gsi.de/despec/Implantation+Stack/15/1">684/1</a>. Then if we look at the time difference between the fast time and the bPlast WRT we see a sharp peak at zero, this makes sense as the AIDA fast time discriminator is being triggered by a pulser which is then being used as a trigger for bPlasts DAQ so these events should be virtually arriving without delay. The delay we do see is infact around 750 ns.

The data collected overnight was also analysed as shown in <a href="https://elog.gsi.de/despec/Implantation+Stack/15/3">684/3</a> this is the data accumulated with the 22Na source close to the snout and a global threshold in the fast discriminator of 0x0f. The centre peak was roughly fitted with a gaussian:

NO.   NAME      VALUE            ERROR          SIZE      DERIVATIVE 
   1  Constant     1.21277e+03   2.74526e+01   5.66915e-01  -5.61074e-07
   2  Mean        -1.78513e+02   8.50699e+00   1.62947e-01   1.58554e-06
   3  Sigma        3.48571e+02   4.03993e+00   6.26343e-05  -1.86863e-03</pre>

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