AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
DESPEC
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Entry time:
Sat Aug 16 18:19:32 2025
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> On the 18th of September we installed DSSD 3208-14 > > Was found to have problems including exponential leakage behavior > > V Ic > -5 15.4uA > -10 53uA > -15 Tripped at over 100uA > > Cables were double checked, bond wires were checked and no problems could be observed. > > DSSD replaced with 3208-15 > > Bias at -100V Ic 10.2uA GP/grnd Jumpers removed, > rising upwards, possible short circuit as well. > > Jumpers replaced > > Bias -100V Ic 1.6uA > Bias -160V Ic 1.62uA > > Possibility that mechanical sample 3208-17 and 3208-14 have been swapped. (To check at later date) > > FEEs powered up and Adapter boards and all grounding installed with DSSD going to 9,10,11 and 12 > > Rates shown - attachment 1 > Waveforms - attachment 2-4 > 1.8.l Spectra - attachment 5 > FEEs 10 and 11 around 60FWHM and 9 and 12 around 80-90FWHM > Stats page - attachment 6 > > Aluminium foil used to make sure all ports are light tight shows a stats drop of around half - attachment 8 > > New peak widths > > aida09 - 79.65 > aida10 - 67.37 > aida11 - 59.99 > aida12 - 97.83 > > Going to begin a systematic study of shaping time > > FWHM > Shaping Time aida09 aida10 aida11 aida12 > > 8 79.65 67.37 59.99 97.83 > 7 97.55 70.84 62.67 115.34 > 6 100.72 70.04 62.77 120.05 > 4 147.47 80.64 71.34 167.23 > 2 217.62 114.98 133.35 232.47 > > Shaping time 8us 1.8.L Shots > Shaping time 4us Stats appear obviously worse - attachment 7 > 1.8.L Widths - attachment 8 > Shaping time 2us Stats appear worse again - attachment 9 > 1.8.L Widths - attachment 10 > Shaping time 6us Stats are better than 2 and 4 - attachment 11 > 1.8.L widths - attachment 12 > Shaping time 7us Stats are better than 6 - attachment 13 > 1.8.L widths - attachment 14 > > > 8us is the optimum shaping time. > Taken back to 8us and similar shaping times are observed. > > Connected the ground of all 4 adapter boards with direct cables. Observed improvements in both FEEs 9 and 12 > however the noise in 11 went > through the roof >500kHz - attachment 15 > > Tested just having 9,10 and 12 connected the rates are comparable to when disconnected - attachment 16 > > All 4 grounded together with a ground running to the snout as well stats No difference to all 4 together - > attachment 17 > 1.8.L Widths - attachment 17 > aida09 104.76 > aida10 84.58 > aida11 281.77 > aida12 82.58 > > Tested just having 10 and 12 directly connected. Same side of the DSSD: Noise is the same as when disconnected. > Stats - attachment 19 > 1.8.L spectra - attachment 20 > > aida09 107.13 > aida10 67.02 > aida11 66.78 > aida12 131.51 > > Tested having 11 and 12 connected directly. This is the two adapter boards responsible for the bias with 11 > carrying the core and 12 the braid. > Massively reduced noise in 9 and 12, comparable noise in 10 but much more noise in 11. Stats - attachment 21 > aida09 63.96 > aida10 76.64 > aida11 125.96 > aida12 68.05 > 1.8.L spectra - attachment 23 > > > > 18:39 Alpha run started in /TapeData/Sep18/R2 > Writing at 96kb/s > 11 Was fast at start bus asic control brought it down > > > > >
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