ELOG AIDA

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

AIDA

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Entry time:

Wed Apr 22 08:50:59 2015

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22/04/15
1230: Solved problem (empty spectra despite changing modules) with nnaida5 noted in previous progress update.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; During Feb tests, nnaida5 was very noisy compared to other nnaida =&gt; switched it to medium energy range to effectively turn it off.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This was saved in the default setting so this same configuration was loaded on startup.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Changed back to low energy mode, giving nnaida5 equally good performance as other nnaida, and altered system settings save file.
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1630: Added heavy duty ground cabling to the copper blocks holding the adapter PCBs in loop around inner FEE modules with connections out to further out ones.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Removed PC-S copper braids with clippy ends.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Put electrical tape over the surrounding aluminium cooling crate to prevent electrical contact with that.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Using BB18 detector 2977-20 connected to FEEs 1, 3, 5, 8 using kaptons labelled E, B, F, G respectively.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The FEEs connected to the detector saw much higher low-energy noise levels and typical FWHM of pulser peak increased by ~100ch to ~250ch.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reduced shaping time and increased thresholds but saw no improvements.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Refitted PC-S clippy copper braids in loop around inner most FEE modules and saw all pulser FWHM reduced to the ~130-150ch we saw during Feb tests (see attachments 1-4).
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Suggests poor electrical connection between adapter PCBs and copper blocks.
&nbsp;
1840: Added 4 new FEEs (nnaida25+26, 29+30) to system for use with new adapter PCBs accepting LEMO inputs from BigRIPS DAQ.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Edited /MIDAS/config/TclHttpd/aidas1@8015/startup.tcl to make system contain new FEEs.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Created new ASIC setting save file @ /MIDAS/DB/2015Apr22-extraInput.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nnaida25,29 have positive pre-amp polarity and nnaida26,30 have negative pre-amp polarity (along with other associated setting).
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