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PC Cluster Reconstruction

This document provides an overview of the MPadRec tool for cluster reconstruction in particle physics experiments. Detailed explanations of pad, cell, and cluster definitions are included, along with information on data flow, slow simulator, and hit reconstruction. The PCPIX resolution efficiency report and details on reconstructing clusters from GEANT hits are also discussed. The text outlines the functionality of the PC display utility, its input requirements, and guidance on the search mode variable for improved cluster matching. Moreover, the document presents future outlooks, such as cosmic ray tests and upcoming software updates.

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PC Cluster Reconstruction

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  1. PC Cluster Reconstruction By Paul B Nilsson Div. of Cosmic and Subatomic Physics Lund university, Sweden July 1999

  2. Terminology Pad A pad consists of nine smaller connected parts called pixels Cell A cell is the group of three pixels belonging to three neighboring pads Cluster A group of fired cells, e.g.

  3. Data flow Slow simulator Maintained by Xie Wei (Weizmann) mPadSlowSim Cluster reconstruction Maintained by Paul Nilsson (Lund) mPadRec mPadEvaluate Stream of pads from slow sim Cell clustering Hit reconstruction

  4. Outline of the mPadRec hit reconstruction S T A R T PCPIX_FIND_CLUSTER PCPIX_NR_OF_PARTICLES Cellx[] Cellz[] (Coordinate vectors) = 2 particles ? Yes S T O P No Are there any more clusters? Fill tables PCPIX_CALCULATE_POSITION PCPIX_SPLIT_CLUSTER +

  5. PC1 resolution Created with an older version of mPadRec RMS dx = 0.36cm dz = 0.37cm dx and dz are defined as (xPISA - xREC), and (zPISA - zREC)

  6. PC2 resolution Created with an older version of mPadRec RMS dx = 0.59cm dz = 0.60cm

  7. PC3 resolution Created with an older version of mPadRec RMS dx = 0.76cm dz = 0.75cm

  8. PC reconstruction efficiency report (hjievt_175auaucentsq01_022699nv20.pisa.cZ) With a “typical” PISA file Table PC1PC2PC3 Number of input GEANT clusters 408 440 483 Number of reconstructed clusters * 394 419 462 Reconstruction efficiency * 96.6% 95.2% 95.6% Clusters corresponding to a GEANT hit * 100% 100% 100% Clusters not corresponding to a GEANT hit * 0% 0% 0% Cluster matches within r = 3 / 4 / 5 mm ** 99.74% 99.03% 99.56% Comparison with GEANT information is meaningless due to a bug in the repository version of mPadEvaluate. The bug can’t be fixed as the chain is broken, i.e. STAF doesn’t compile anymore.. * The figures are with the latest mPadRec version not yet put in the repository; can’t be run at the moment due to the broken chain. Main difference: the search_mode variable (more later..) ** With the repository version (can still be run). A trick is required to get the effiencies..

  9. PC display utility * ROOT based GUI * Stand-alone application * Tool to check the reconstruction * Used with the real PC1 chamber * Input: PRDF files as well as simple text files with hit coordinates * A special (simpler) version can be run from within ROOT * GEANT information will be included a.s.a.p.

  10. The search_mode variable search_mode = 1 search_mode = 2 Do not allow diagonal cells to be neighbors (“better”) [new version] Allow diagonal cells to be neighbors (“bad”) [repository version]

  11. Bad [repository] setting of search_mode Fired cell Reconstructed hit BAD!

  12. Good setting of search_mode Fired cell Reconstructed hit BETTER!

  13. Outlook * Cosmic ray test will tell what REAL clusters might look like * Updated version of mPadRec will be put in the repository a.s.a.p. * New improved C++ version of mPadRec is on the way (PHOOL version)

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