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Can we tag on SVT at L2? Bill Ashmanskas, CDF TDSWG meeting, 2001-08-15

Can we tag on SVT at L2? Bill Ashmanskas, CDF TDSWG meeting, 2001-08-15. SVT has been producing fitted tracks since April Resolution has improved, fake rate decreased, as we made improvements. Now s ~ 50-70 m m A few technical problems remain:

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Can we tag on SVT at L2? Bill Ashmanskas, CDF TDSWG meeting, 2001-08-15

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  1. Can we tag on SVT at L2?Bill Ashmanskas, CDF TDSWG meeting, 2001-08-15 • SVT has been producing fitted tracks since April • Resolution has improved, fake rate decreased, as we made improvements. Now s ~ 50-70mm • A few technical problems remain: • Need to limit number of tracks, e.g. via Track Fitter c2 cut (trivial) • Need to correct for beam spot (straightforward, but some work; discussion at end) • Need to solve XTRP synch problem (show-stopper, but intensive effort underway) • We are confident SVT can provide good tracks for L2 tagging by September; we should try to make use of the output downstream • Early debugging of highest-BW trigger path • Exercise L2, e.g. every owl shift • Once we cut => enriched sample to study tails, reduce rates • Provides pressure to move both SVT and L2 into “production” state, similar to transition made by SVX after last shutdown

  2. SVT at TDSWG meeting, 2001-08-15, page 3 • Suggested plan: • SVT sends fake tracks to L2, starting now • TrigMon checks SVTD, TL2D data (BC+tracks), make sure OK over a long period (days) • Implement impact-parameter code in Alpha • Implement options in trigger table GUI • L2 tags on fake tracks (pick whichever single SVT trigger is easiest to code in Alpha) • Debug upstream/downstream of SVT/L2 cable in parallel • When both ends are thought to be working, we switch over to real tracks, repeat checks • This should give us a working impact-parameter trigger at the earliest opportunity • Provides an early stress test of the trigger’s most complex data path • Ensures that software is in place by the time the hardware is ready

  3. SVT at TDSWG meeting, 2001-08-15, page 4 • About the beam spot: • Luciano’s beam fitter already runs in VME CPU (b0svt06) to fit beam spot in each of 6 bulkheads, every ~10 seconds • tested on replayed data during shutdown • Plan is to write beam position data over VME into GhostBuster board, which would apply correction to tracks • Correction would be updated as often as it can be reliably calculated; use double-buffering in GB so that switchover is clean • Start from “best guess” when run begins • Read out (x0,y0,x1,y1,…,x5,y5) from GB into every event, so that you always know exactly what correction was applied to a given event • We will have this working and tested before we turn on real data to L2 • If disaster strikes, there are two backup options: • Apply correction in Track Fitters • Apply correction in L2 processor

  4. SVT at TDSWG, 2001-08-15, page 2 • Emulated SVT, July 7-8 data

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