AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
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DESPEC
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EDI_PSA
179Ta
CARME
StellarModelling
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K40
AIDA
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Entry time:
Sat Mar 29 12:37:07 2025
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Continued work on beta-trigger for EURICA. However the system seems to have different noise condition than before, which we think appeared after we changed power source for FEE's PSU (https://elog.ph.ed.ac.uk/AIDA/220). This is high frequency noise of low amplitude, with a period of 10 usec. The effect on the resolution measured with the pulser is not too large - thus our conclusion in elog entry 220 that noise conditions had not changed much - but the noise does create a large trigger rate that would not allow us to set a low trigger threshold (for MAC-B outputs from fast discriminators). The rate of singles from front or back, as well as coincidence of front-back strips, increased by more than a factor of ten compared to previous conditions (e.g. ~200 coincidences for one ASIC enables in each side of DSSD1, and fast threshold of 10). Saved some data in this conditions, with a threshold of 16 for the fast discriminators (enabled in one ASIC for 8 of the FEEs). When fast discriminator lowering threshold to 9, the system got upset and lost synchronization. Tomorrow we'll attempt to revert to previous configuration of PSUs. R16*gz: DSSD HV: +100 for all. Leakage current (uA): 4.2, 4.9, 3.7, 3.9, 4.2, 3.8, 10.7 (from Det#1 to veto) Enabled fast discriminators in ASIC2 of DSSD1 and DSSD5 (NNAIDA#: 25, 30, 27, 32, 9, 13, 11, 16) DSSD#1 is next to 207Bi source
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