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DAQ fo KL and TOF

DAQ fo KL and TOF. Jean-Sebastien Graulich, Geneva. General Information Status of Synchronization problem FEE for TOF2. Reminder. TOF Front End KL Front End. Issues (1). Cross Talk Possible sources Splitter RC Shaper Twisted pair cable Affecting both TOF and KL

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DAQ fo KL and TOF

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  1. DAQ fo KL and TOF Jean-Sebastien Graulich, Geneva • General Information • Status of Synchronization problem • FEE for TOF2 Jean-Sebastien Graulich

  2. Reminder • TOF Front End • KL Front End Jean-Sebastien Graulich

  3. Issues (1) • Cross Talk • Possible sources • Splitter • RC Shaper • Twisted pair cable • Affecting both TOF and KL • Cabling done in such a way that Requiring coincidence between opposite PMTs reduce the effect strongly but not completely • Needs some dedicated studies • Action: A better splitter is under production in Geneva Jean-Sebastien Graulich

  4. Cross Talk • Consequence: Dead Channel unnoticed ! (rate != 0) Counts - S6 in TOF 1 (ch 73) - Disconnected in the hall - Probably for the entire September run TDC01 Channel Number Counts Jean-Sebastien Graulich TDC00 Channel Number

  5. Issues (2) • Discriminator dead time • Minimum width of logic signal after discriminator: 100 ns • Double pulse resolution: 110 ns • In a given TOF PMT, it is IMPOSSIBLE to see two hits in the same burst ! • Complying with specifications but a real limitation Jean-Sebastien Graulich

  6. Issues (3) • Noise in FADC • Fluctuating baseline • Seems to be time correlated with the particle trigger • Affects Charge resolution • Needs dedicated studies Jean-Sebastien Graulich

  7. Synchronization Problem • TOF and KL FEE in different VME Crates • Each crate receives separate DAQ trigger at the end of the spill • Perfect Synchronization needed for correlation between TOF and KL Jean-Sebastien Graulich

  8. Understanding the Problem • Synchronization can be lost because of • Unstable electronics in DAQ trigger distribution • Unstable behavior of the VME/Pci Interface • The DAQ software release the busy and enables the DAQ trigger receiver channel after readout • Must go through the VME/Pci Interface • It happens that one of the two commands is not executed properly… • Unpredictable • Cured only by a power cycle • Has to be monitored Jean-Sebastien Graulich

  9. DAQ Trigger Monitor counts Number of LDC receiving a DAQ Trigger per DAQ event # of DAQ Triggers LDC Number Jean-Sebastien Graulich

  10. Particle Trigger monitor Counts TDCs V1724 FADCs Scalar ch0 V1731 FADC Equipment number # of Part Triggers LDC Number Jean-Sebastien Graulich

  11. FADC behavior • During September Run • One FADC didn’t accept particle triggers at all • I am suspecting a hardware failure • Another FADC missed all the particle triggers for 1 single spill at the beginning of the run and then behaved normally • Need to be sorted out with CAEN • I need help here Jean-Sebastien Graulich

  12. FEE for TOF2 • Needs (ignoring cabling and HV) • 1 TDC V1290 • 5 FADC V1724 • Splitters and Shapers available in Geneva • To be shipped • Issues • NIM crate room • Not sure the power supply will stand a full load • VME crate room • All TOF TDC must be in the same crate • TOF FADC will go to KL crate • A major update of crate layout is necessary ! Jean-Sebastien Graulich

  13. Summary • TOF0/1 and KL in good shape • Cross talk needs attention • Synchronization has to be monitored • TOF2 installation is not trivial Jean-Sebastien Graulich

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