ELOG AIDA

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

AIDA

Fields marked with * are required
Entry time:	Sat Mar 29 12:27:58 2025
Author*:
Subject*:
<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>Upon starting system with nothing connected beyond adapter PCBs, observed pulser peak FWHM of ~12-15ch in nnaida13+14 and ~15-18ch in nnaida11+12</p> <p>All newly shielded new kapton cables passed continuity tests between drain wire and Cu tape.</p> <p>Throughout all tests, grounded cable has been connected to nnaida13. All other nnaida have ground isolated cables.</p> <p>Initially, upon biasing, leakage current reached 50uA at ~2V HV and tripped.</p> <p style="margin-left: 40px;">After much searching, found one of the drain wires from the kaptons to be touching the core of the HV cable.</p> <p style="margin-left: 40px;">Tidied all drain wires and made sure none were touching anything they shouldn't.</p> <p style="margin-left: 40px;">Bias ramped up successfully to +200V with leakage current of 5.630uA @ room temp ~25.5oC.</p> <p>Very noisy waveforms to begin with, notes Cu tape on kaptons was in contact with the Al housing for the detector.</p> <p>Isolated kaptons from Al housing with black tape and the waveforms became much less noisy, but still not as calm as expected.</p> <p>Connecting Cu covered kaptons with croc clips made this problem worse. However, grounding adapter PCBs together improved the waveform noise.</p> <p>FWHM with new cables ~200-300ch, much worse than previous cables.</p> <p>Reconnected system with old kaptons and they now see FWHM of ~200-300ch, as opposed to ~100ch observed earlier in the year.</p> <p style="margin-left: 40px;">What has changed?</p> <p>Waveforms are smoother with old kaptons, but still not as flat as previously observed.</p> <p>Had some issues with waveforms not being output by FEE cards and ASIC4 of nnaida12 has failed to Check/Load and is not outputting any data.</p> <p>Standard ASIC parameters throughout, with shaping time of 0.5us.</p></td> </tr> </tbody> </table> </p><p> </p> Encoding: HTML ELCode plain Suppress Email notification

Attachment 1:
Drop attachments here...

ELOG V3.1.4-unknown