AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
AIDA
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Sat Mar 29 12:26:22 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>13/12/15</p> <p>Current jumper setup:</p> <p> - detector 2977-15 connected to nnaida1,3,5,8 with GND kapton to nnaida1</p> <p> - bias of +75V to nnaida3 and nnaida5</p> <p> - Jumpers:</p> <p> - nnaida1 > Lk1. If Lk3 3 connected unable to bias detector</p> <p> - nnaida3 > Lk3. if Lk1 connected unable to bias detector as the HV ground reference is connected at both p- and n-sides of detector.</p> <p> - nnaida5 > Lk1 + Lk3</p> <p> - nnaida8 > Lk3</p> <p>Powered system up as it was last night -> 2977-15 connected to nnaida1,3,5,8 with only 4 FEE modules powered.</p> <p> - n-side widths ~190-200 ch</p> <p> - p-side widths ~100ch</p> <p> - jumpers as above, ASIC setting as 2015Dec12_smallSetup, wav thresholds all at 500 apart from nnaida5 @ 250.</p> <p>Spend remainder of day trying to fit mezzanine cables.</p> <p> </p> <p>14/12/15</p> <p>Completed installation of mezzanine cables.</p> <p>Resistance between all mezzanines and cooling crates still ~200 kOhms (up from ~2-5 Ohms on our arrival), apart from nnaida7+8, which is now at ~5 Ohms</p> <p>However, all see resistance to main vertical copper pipe of ~3 Ohms.</p> <p>As best as I can see, isolating tape in still in place for all FEEs => unknown point of contact.</p> <p> > LEMO cables to test inputs carry ground connection from NIM bin -> NIM bin in electrical contact with support frame -> coolant loop in electrical contact with support frame => electrical connection still present between FEEs and coolant loop, even in insulating guide pins are introduced</p> <p> > this problem is not observed at DL because the NIM bin in on the wooden table top and isolated from the coolant loop and any support structure</p> <p> > is it possible to isolate the NIM bins from the support structure?</p> <p> > need to come up with some more systematic and fixed way/positions for measuring these resistances, i.e. always measure mezzanine to X.</p> <p>Resistance between all mezzanines now ~ 0.5 Ohms.</p> <p>n-side widths ~ 120ch and p-side widths ~ 120ch => peak widths almost halved in n-side, but increased by ~20% in p-side.</p> <p> </p> <p>Attempted to bias previously tripped detector.</p> <p> - same jumper combination as other detector caused failure to bias > leakage current jumps to 50uA at ~2V and trips shortly after, ramping back down from there.</p> <p> - removed all jumpers and see same thing.</p> <p>Will try again in the morning by attaching 3131-11 to cables currently on 2977-15, but it looks like 3131-11 really is defective somehow.</p></td> </tr> </tbody> </table> </p><p> </p>
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