AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
AIDA
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Entry time:
Fri Mar 28 20:47:37 2025
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> MSL type BB18-1000 2998-22 bias +200V I_L +3.52uA > > > Detector bias CAEN N1419 Programmable HV Power Supply > - FAGND isolated from AGND (AGND = NIM chassis ground) > - floating HV supply, <5mV pp noise specification > - configured + polarity, i.e. core to nnaida11 & nnaida12 MSL type BB18 n+n ohmic strips > braid to nnaida12 & nnaida13 MSL type BB18 p+n junction strips > - configured bias voltage to 200V, max bias voltage 200V, max leakage current 20uA, > trip 10s, ramp up/down 1V/s > > > BNC PB-5 > > amp 0.5V > atten x1 > tau_d 1ms > freq 100Hz > pol - (output split via EG&G Ortec 433A to generate + polarity too) > > > PSU > > Standard AIDA FEE64 PSU + new filter PCBs > > > Adaptor > > nnaida11 & nnaida12 - polarity input (n+n ohmic strips) > MSL type BB18 adaptor PCB rev 180713 LK 3 & 7 > nnaida13 & nnaida14 + polarity input (p+n junction strips) > MSL type BB18 adaptor PCB rev 290114 LK 1, 3, 5 & 7 > > +/- test inputs terminated by 50 Ohm > > DSSSD grounded locally at nnaida12 & nnaida13 adaptor PCBs > by ground links LK 1 & 5 > > Adaptor PCB grounds connected by thick copper braid (see attached images) > > FEE64 > > nnaida11 2b:09:ce > nnaida12 2b:09:e8 > nnaida13 2b:09:07 > nnaida14 2b:22:55 > > FEE firmware release 0x16cee018 > > > ASIC parameters > > Default ASIC parameters (EXPERIMENT/AIDA/2014Aug13-13.44.58) except > - shaping time 2us > - slow comparator 64 (hex 40) > - nnaida11 & nnaida12 preAmp reference 0x30 -> 0x38 > which will reduce linear output range but significantly stabilises > negative polarity input ASICs > > > Typical pulser peak widths for nnaida11, 12, 13 and 14 c. 130-150ch FWHM. > Without the copper braid connecting the two adaptor PCBs the peak widths > are typically 200-250ch FWHM. > > > > The problem observed last week (leakage current > 20uA, bias c. 3V, i.e. an > apparent 150k short) was found to be due to a fault on the n+n side FEE Adaptor > PCB rev 290114. Specifically the left hand connector was faulty. The exact > nature of the fault has not yet been determined but will be investigated. > > For time being the rev 290114 PCB has been replaced by a rev 180713 PCB > with a 2-way IDC connector from the HV cable (core) to LK1.
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