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PS VFE & PS/SPD FE Electronics Status and Plans

PS VFE & PS/SPD FE Electronics Status and Plans. 21 November 2007. LPC Clermont. PS/SPD FEB Production Status. Production & Tests finished : 112 PS/SPD FEB produced (including 2 prototypes) 100 installed

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PS VFE & PS/SPD FE Electronics Status and Plans

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  1. PS VFE & PS/SPD FE Electronics Status and Plans 21 November 2007 LPC Clermont

  2. PS/SPD FEB Production Status • Production & Tests finished: 112 PS/SPD FEB produced (including 2 prototypes) 100 installed 8 boards shipped back to Hitachi for reparations / returned to LPC / in testing • Hard bug spotted on FE current limiters thresholds ( DL1 & DL2 ): currents in FEPGA increases by 0.2-0.3 A when connecting VFE to FE / whatever VFE/FE activity current limit underestimated current limit hard controlled by a resistor value / increased to max value of 2 A ( nominal 1.6 A expected )

  3. FEB Installation Status • All 100 FE boards patched for 2 A, ‘on flight’ in pit 8. 1+ week work for de-cabling / soldering / re-cabling • C side fully tested: - New 2 A limit: All FE/VFE couples checked OK - RJ45 cabling (VFE/FE ): 2 pathologic channels ( SM3 & SM4 Top) / RJ45 cable or VFE side connection problem • A side testing ongoing … - 25 % done ( PRS6 + ½ PRS5 ) - 1 dead VFE/FE contact / FE connector suspected PRS5-FE02 - Last board FE 106 installed last week / Tests required

  4. RJ45 RJ45 RJ45 RJ45 VFE Sagita Issues • Sagita on back of VFE boards  lost of connection for CLOCK signal / Due to ? - Stresses through VFE RJ45 cables / in detector movements - ‘Natural’ relaxation of the VFE board / in time • Statistics: - C side: 7 / 50 VFE lost from may to July 2 / 50 VFE lost from July to September 2 / 50 VFE lost from September to November - A side: 2 / 50 VFE lost from may to September No loss from September to November VFE electronics CLOCK VFE connectors RJ45 Signal Signal power Schematics of VFE ( 2 boards + connectors): sagitta caused by ?

  5. Marathon PSU Issues • Marathon power supply unit (PSU) PRS7 dead - shortcut suspected @ 380 V connector @ Marathon side (platform) / To be confirmed - PSU returned for repair / Bldg 4. / No spare ? / How long ? • Pathologic channel 0 on Marathon VFE PSU / Both sides! / Pending issue - C side: SPD is concerned - A side: PS is concerned

  6. VFE Temperature Monitoring & Cooling • Monitoring of VFE temperatures functional (ELMBs / PVSS) • Cooling installed ! - Water leakage alert on Sunday 11 November / But … the cooling was turned off on Friday 9 ??? - To be commissioned ( degrees C / hours ) SM4-VFE05 / No cooling VFE ON Neighbour VFE ON All OFF

  7. Prospects • Commissioning: - Get to work with CROC V4 & final specs setup / DAQ tests - VFE cooling stress tests - Flash A side channels with LEDs • Calibration: - Set internal Phasers FE/VFE for DAQ • Monitoring: - FE/VFE connectivity / Periodic survey Foreseen strategy: 1st Validate remote operation with CROC V4 in PRS0 / commission cooling This will allow automatisation of calibration & monitoring tasks

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