1 / 13

OPERA brick scanning by the European Scanning System

OPERA brick scanning by the European Scanning System. Basic concepts. DB is used as the backbone for operations Not only book-keeping but living memory and working tool Data immediately ready for publication. Scanback-scanforth-followdown procedures Can use base-tracks and/or microtracks.

dieter
Download Presentation

OPERA brick scanning by the European Scanning System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OPERA brick scanning by the European Scanning System

  2. Basic concepts DB is used as the backbone for operationsNot only book-keeping but living memory and working toolData immediately ready for publication Scanback-scanforth-followdown proceduresCan use base-tracks and/or microtracks TotalScan can use volumes of any shapeContinuous data quality monitoring20 cm2/h/side/stage Optical/X-ray marks1-zone/3-zone/no intercalibration by tracks

  3. Scanback-scanforth-followdown Candidates are propagated with last position/slope(position only if microtracks - tunable) Candidate selection based on:1) slope agreement2) track quality + tolerance cuts3) combined slope+position agreement Forking (multiple candidates) supported but not yet used (relevant only on first plate)

  4. Scanback-scanforth-followdown Typical performances using local intercalibration 4 micron 2 mrad Fill factor in the range 85%÷100% (base tracks) or 97%÷100% (mtracks) Stopping point is reliable

  5. Scanback-scanforth-followdown Coming soon: Plate skipping to speed up search Switching from Optical to Lateral X-ray and vice-versa(for plates with damaged grid or X-ray marks)

  6. TotalScan (Volume scan) Continuous data quality monitoring Base track density is a good quality estimatorHowever, all microtracks are saved to the DB Data are already aligned (within 20 mm) if calibrated optical marks orlateral X-ray marks are used Full reprocessing is available using DB data, as deeply as with raw data files The logical association between a volume and the stopping point is savedand documented in the DB (no need to “guess”)

  7. Vertex confirmation with TotalScan data At least two volume scan data sets available: 1) Intercalibration data around scanback path (4÷6 mm linear size) Hard cuts to improve purity for intercalibration Alignment and vertex reconstruction available few seconds after end of scanback SB (red) + Intercal data (rainbow)2) Volume scanning around confirmed stopping point (1 cm2 at least) Record all microtracks, focus on efficiency Usually needs 1÷2 hours’ scanning Complete emulsion reconstruction possible with full dataset

  8. Data quality with TotalScan data Track precision is 0.9 mm already in preliminary reconstructions(vertex confirmation), inclusive of scattering effects Dy fit-measure (mm) Fill factor of volume tracks using microtracks is 91%÷100%Vertex and decay search included (re-analysis is obviously possible) Follow-down obtained “for free” in many cases

  9. Intercalibration details Track maps used to intercalibrate brick plates together 3 zone scheme Overall alignment 8×8 mm2/zone Y alignment residuals (mm)vs. X (mm), plate by plate plate X (mm) 1 zone scheme 3 micron Local alignmentfollowing track 6×6 mm2

  10. Scanback following residuals Red and black:2 different bricks Intercalibration details Fixed reference on single plate obtained by Optical Marks or Lateral X-ray Automatic intercalibration by Lateral X-ray marks Working and used in several labs as an alternative to speed up scanningThe ESS can switch from each method to the other

  11. Efficiency improvement Fill factor of base tracks higher in SB (91%) than in TS (84%) Working group investigating First results: efficiency related to number of trials in scanning(tracks in overlapping areas have higher probability of being taken) Work going on, checks on optical effects coming soon

  12. Efficiency/precision improvement Working group developing Z-synchronized data taking Z Camera Improved Z determination should increase base track precision and efficiency, possibly microtrack efficiency and precision too Prototype SW expected in next weeks

  13. Conclusions European Scanning System is already producing complete emulsiondata sets (vertex location + study) Data quality good, physics reconstructions in emulsion also attempted Data already available in Central DB for analysis and algorithm testing System still evolving, efficiency/precision improvements going on(+ more to be shown during Emulsion Workshop)

More Related