Transcript ppt
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 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 ) 2 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 3 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 VFE electronics CLOCK VFE connectors RJ45 power Schematics of VFE ( 2 boards + connectors): sagitta caused by ? 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 4 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 5 VFE Temperature Monitoring & Cooling Monitoring of VFE temperatures functional (ELMBs / PVSS) ( degrees C / hours ) SM4-VFE05 / No cooling All OFF VFE ON Neighbour VFE ON Cooling installed ! - Water leakage alert on Sunday 11 November / But … the cooling was turned off on Friday 9 ??? - To be commissioned 6 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 7