AIDA
GELINA
BRIKEN
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ISOLDE
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CARME
StellarModelling
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AIDA
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Entry time:
Sat Mar 29 11:36:11 2025
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<p>22/04/15</p> <p>1230: Solved problem (empty spectra despite changing modules) with nnaida5 noted in previous progress update.</p> <p> During Feb tests, nnaida5 was very noisy compared to other nnaida => switched it to medium energy range to effectively turn it off.</p> <p> This was saved in the default setting so this same configuration was loaded on startup.</p> <p> Changed back to low energy mode, giving nnaida5 equally good performance as other nnaida, and altered system settings save file.</p> <p> </p> <p>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.</p> <p> Removed PC-S copper braids with clippy ends.</p> <p> Put electrical tape over the surrounding aluminium cooling crate to prevent electrical contact with that.</p> <p> Using BB18 detector 2977-20 connected to FEEs 1, 3, 5, 8 using kaptons labelled E, B, F, G respectively.</p> <p> The FEEs connected to the detector saw much higher low-energy noise levels and typical FWHM of pulser peak increased by ~100ch to ~250ch.</p> <p> Reduced shaping time and increased thresholds but saw no improvements.</p> <p> 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).</p> <p> Suggests poor electrical connection between adapter PCBs and copper blocks.</p> <p> </p> <p>1840: Added 4 new FEEs (nnaida25+26, 29+30) to system for use with new adapter PCBs accepting LEMO inputs from BigRIPS DAQ.</p> <p> Edited /MIDAS/config/TclHttpd/aidas1@8015/startup.tcl to make system contain new FEEs.</p> <p> Created new ASIC setting save file @ /MIDAS/DB/2015Apr22-extraInput.</p> <p> nnaida25,29 have positive pre-amp polarity and nnaida26,30 have negative pre-amp polarity (along with other associated setting).</p> <p> </p>
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