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Beam timing distribution

Beam timing distribution. R. Fantechi 3/2/2010. The NA48 timing scheme. Need to add some more signal to the SPS ones SPS: WWE : 1 second before beam WE: beginning of the beam EE: end of beam NA48: EC : some time after EE to allow for out-of-burst calibrations

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Beam timing distribution

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  1. Beam timing distribution R. Fantechi 3/2/2010

  2. The NA48 timing scheme • Needtoadd some more signalto the SPS ones • SPS: • WWE : 1 secondbeforebeam • WE: beginningof the beam • EE: end ofbeam • NA48: • EC : some timeafter EE toallowforout-of-burstcalibrations • ET: 1 secondbefore WWE toallowforreadoutclean-up • Specialfor the clock • Clock Reset : sent to the clock system by the timing system fewmillisecondsbefore WE; zero of the timestamps • Clock Stop: generatedby the clock system some timeafter EC; stop of the timestampcounters

  3. The implementation • Based on NIM modules • Leveladaptersfrom the TTL signalsfom SPS (WWE,WE,EE) • Digitaldelaysto create EC, ET, Clock Reset (Perugia) • Fan-outmodulesto drive transmittersto 4 locations • Scalerstocheck the timedistancebetweenpulses • Pseudo-differential TTL transmittersand 4*12 cablepairstodistributesignals • Kabes area, Driftchambers, Electronicsbarrack, TechnicalGallery • Pseudo-differential TTL receivers at the 4 ends • Leveladapters and fanoutforusers • Pseudo-differentialtransmission back in the controlroom • Receivers and scalerformonitoring in the controlroom • To spot transmissionproblems • Fake timing generation if SPS isnotrunning

  4. Usage in NA48 • The mainuseris the trigger supervisor • All the signalsusedforaninternal state machine • Troublesifonesignalismissing… • WWE- EC cyclecheckedalmostbyallreadouts • Housekeeping out ofburst • In some case the right sequenceischecked and anerrorisgivenif the timing isnot right • In some case usedto create burstgates • The system isflexible • During the years, SPS timing haschanged and ithasbeenalwayspossibleto set up ourdistribution in the right way • Here and thereproblemswithmissingpulses, notreallywellunderstood • It can alsoberelatedtointermittentproblems in the userchain

  5. A first proposalfor NA62 • The TTC system willdistribute a SOB and an EOB • Use WWE or WE (or a derivedsignal in between) as SOB • Use EC as EOB • Keep the existingstructure (TX, RX, cables) • Consolidate the logicfor the generation (old NIM modules) • Improvemonitoring • Define the location of the TTC in ordertobring, ifpossible, onereceiving station nearby • Besides TTC, userscouldhaveaccesstosignalsfor some standalone task • May be don’t distributeanymore ET (notreallyused in the past) • If the main clock source willnotbe the NA48 clock, clock reset couldbedropped

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