ELOG DESPEC

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

DESPEC

Fields marked with * are required

Entry time:

Wed Jun 1 07:35:13 2022

Author*:

Subject*:

Attachment 1 - DSSSD bias & leakage current - OK

Attachment 2 - ADC data item stats

Attachment 3 - FEE64 temps - OK

Attachments 4-7 - aida01, 02, 03 & 04 2.*.W spectra

Noise observed for asics #1 & #2 of aida02 consistent with no cable attached - confirmed by visual inspection - ribbon cable disconnected from Samtec header of adaptor PCB

To Do list

1) re-connect ribbon cable to aida02 adaptor PCB
2) good quality ground to snout - use screws at inter-stage
3) install heavy duty grounds
4) ...

Attachment 8 - adc data item stats - slow comparator 0x64

Attachment 9 - per FEE64 rate spectra - slow comparator 0x64

Attachment 10 - per FEE64 rate spectra - slow comparator 0xa

13:30 - Attach heavy duty ground to AIDA

Attachment 11 - per FEE64 rate spectra - slow comparator 0xa

Try power cycle as system ground changed significantly now

Try to reattach aida04 TTY connector - still wrong

Archive old tty logs (ttyUSB*) to zip and delete them, makes easier to track startup

Attachment 12 - per FEE64 rate spectra - slow comparator 0xa

No major difference, aida01 quieter than before

aida05 has some missing channels - loose ERNI?

Attachements 13 & 14 - Waveforms

Temporarily raise to 0x64 and test merger for DTAS synchro test later... all works good to MBS 
Change NETVAR MERGE.LinksAvailable to 8

Notice one copper screw touching aluminium, add some kapton tape behind it to isolate it. No difference

Voltage diff between aida02,aida06 < 1 mV
Voltage diff between copper bars < 0.5 mV (but not 0)

A comment from DTAS people that they observed a large increase in noise recently - perhaps from accelerator
May indicate current power/gronud oddities?

Attachment 15 - Rates at 0x1f (= 310 keV)

DSSSD#1 reasonable (aida04 a bit bad), but mostly just pulser (25 Hz)

DSSSD#2 much worse esp. p+n sides (aida05, aida07)

ERNI connectors pushed in and feel fully in

Encoding: HTML ELCode plain
Suppress Email notification Resubmit as new entry

Attachment 1: