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Dimuon HLT Design and AliRoot Intergration

Dimuon HLT Design and AliRoot Intergration. Dimuon HLT Design and AliRoot Intergration. By Artur Szostak UCT-CERN Research Group. By Artur Szostak UCT-CERN Research Group. Function of Dimuon HLT (dHLT). Improve Pt cut resolution. Identify dimuon candidates.

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Dimuon HLT Design and AliRoot Intergration

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  1. Dimuon HLT Design and AliRoot Intergration Dimuon HLT Design and AliRoot Intergration By Artur Szostak UCT-CERN Research Group By Artur Szostak UCT-CERN Research Group

  2. Function of Dimuon HLT (dHLT) • Improve Pt cut resolution. • Identify dimuon candidates. • Reduce data rate to storage by removing background. • Try improve on L0 trigger efficiency. HLT workshop, 6-8 Dec 2004, CERN.

  3. Improvement in dHLT Pt Cut. HLT workshop, 6-8 Dec 2004, CERN.

  4. Improvement in dHLT Pt Cut. HLT workshop, 6-8 Dec 2004, CERN.

  5. Some Basic Facts: • Spectrometer composed of • 10 RPC tracking chambers, with bending (Yaxis) and non bending (X axis) cathode planes. • 4 RPC trigger chambers, behind 2m muon filter. • Large cone absorber in front of whole spectrometer. • Dipole magnet centred on tracking chambers 5 and 6. • Total event size ~ 500 kBytes. • About 150 tracks in spectrometer per central event. • L0 trigger rate = 1. kHz • L0 latency ~ 1.6 μs HLT workshop, 6-8 Dec 2004, CERN.

  6. Spectrometer’s Layout HLT workshop, 6-8 Dec 2004, CERN.

  7. Spectrometer’s Layout HLT workshop, 6-8 Dec 2004, CERN.

  8. dHLT Components HLT workshop, 6-8 Dec 2004, CERN.

  9. Cluster Finder Algorithm • Find maxima along pad column. • Find centre of gravity (weighted by charge) of pad with maximum and its nearest neighbour above and below. • This becomes the reconstructed hit point. HLT workshop, 6-8 Dec 2004, CERN.

  10. Tracker Algorithm HLT workshop, 6-8 Dec 2004, CERN.

  11. Code Structure HLT workshop, 6-8 Dec 2004, CERN.

  12. Code Structure (online case) HLT workshop, 6-8 Dec 2004, CERN.

  13. Code Structure (offline case) HLT workshop, 6-8 Dec 2004, CERN.

  14. Is this useful to anyone else? HLT workshop, 6-8 Dec 2004, CERN.

  15. dHLT/AliRoot Integration Status • MansoTracker integrated into MicrodHLT implementation, all compiled as a Root shared library (.so). • A few auxiliary classes to fetch AliRoot data and store dHLT output also added. • Added functionality for MicrodHLT to use interpreted Tracker code for fast prototyping. • Can run whole dHLT over a galice.root file with about 10 lines of macro code. HLT workshop, 6-8 Dec 2004, CERN.

  16. Some Comments and Questions • User interface to HLT in general should be similar to, or integrated with, AliSimulation. But what exactly should it look like? • It has to be flexible enough to handle all sorts of HLT configurations, now and in the future. • Analysis and Debug components for the online HLT system should also be integrated with AliRoot, but how? HLT workshop, 6-8 Dec 2004, CERN.

  17. Conclusion • We require clear and very well defined interfaces between AliRoot and HLT. • There are large parts of the dHLT code which should overlap with the rest of HLT (TPC HLT for example). We need to identify these common modules, write them once, but make them useful to everyone at the same time. • We have a lot to discuss this week. HLT workshop, 6-8 Dec 2004, CERN.

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