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:	Sat Mar 29 12:25:45 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>Spent whole day trying to isolate mezzanines from cooling crate.</p> <p>Finally managed to increase resistance between crate and mezzanines from ~5 Ohms to ~380 kOhms with some masking tape and parcel tape over the slots in the FEE modules in which rest the guide pins on the bottom of cooling crate.</p> <p>See excellent performance in nnaida11, with peak widths down to ~45ch and almost perfectly smooth waveforms.</p> <p>         - this is with just the kaptons connected (all of which are shielded with tape) and no detector. Shaping time of 8us.</p> <p>Performance in other FEEs remains largely unchanged. (Note: Yesterday saw similar performance in nnaida13+14 for 15mins but lost it and couldn't regain same performance.)</p> <p>Turned off cooler to see what effect that had - no major changes to peak widths.</p> <p>Turned off cooler and loosened crate lid - again no appreciable difference.</p> <p> </p> <p>=> It seems this electrical connection between cooling crate and mezzanines could be the source of a lot of our noise.</p> <p>Could remove pins completely to see effect that has, before trying with plastic ones when they arrive.</p> <p> </p> <p>Attachment 1 shows FADC monitor during period in which ADCs in nnaida14 were not calibrated correctly.</p></td> </tr> </tbody> </table> </p><p> </p> Encoding: HTML ELCode plain Suppress Email notification

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