ELOG AIDA

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

AIDA

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Entry time:	Sat Mar 29 11:35:32 2025
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> Currently seems to be a problem with the memory check in the system wide checks that produces the message shown > - attachment 1 > > DAQ is being run with the following options - attachment 2 and 3 > > The PSU Temperature readout in aida07 appears to not be working. Shows a permanent value of 160 degC - attachment 4 > Water inlet and outlet feel cold so believe it is an artiface > aida07 also appears to quite often take longer to mount than the others. Often coming in 5 minutes later than them. > > Only tested aida01 - aida04 for noise as we lacked the required HDMI type c cables to set up a full MACB branch > structure. > > We appear to have considerable noise issues in the FEE modules with adapter boards on but no DSSD cables > connected but test input loop and pulsar connected. > The pulsar appears to be the circuit of doom for this noise. With all test input ports connected to a pulsar > chain each FEE is seeing in the region of 800k rate of good events with discriminator thresholds set to 255. > Removing the pulsar cable from the end FEE but leaving the chain in place reduces this to around 500k. > > Grounding an adapter board to the copper cooling plate also further reduces this noise somewhat but still leaves > rates of around 300k. > > If an adapter board is isolated from the chain so that it has nothing connected to it the rate drops to around > 300-400 which is just the rate of the sync pulses. > > For the following screenshots aida01 and aida02 are isolated adapter boards. > aida03 and aida04 are connected via lemo cables via the test input to other FEE modules in their chains. > Waveforms for the 4 FEEs - attachment 5-8 > Full statistics for the 4 FEEs - attachment 9-12 > Good events comparison - attachment 13 > > It appears we need to provide a low resistance path between the FEE cooling plates like we do in RIKEN. > Currently the measured resistance between FEE 6 and 10 is around 2 ohm. > > Also we may need to isolate the pulsar signals themselves > > A potential difference of 5mV was also measured between the chassis of the NIM modules and the cooling plates. > Resistance was 0ohm when the power was on. Re:- Memory check problem..... the required log file is not at /MIDAS/XilinxLinux/...... The file is a log file placed in the FEE64 root file system. The code will be altered in time to reflect the new location by using a local variable. Re:- aida07. This module should be urgently removed and sent back to Daresbury for repair. This measurement could be indicative of the worse problems with this module. Re:- Earthing. Please could you add some photos of the installation. ( apologies if they are already here ;-) If I recall it is worth adding a low resistance connection ( big copper braid ) from the NIM bin to the adaptor board earths. Encoding: HTML ELCode plain Suppress Email notification

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