Cosmic Rack Meetings

Previous software meetings

Previous hardware meetings

 

24. October 2005

Chair: Alexander

Present: Ivan, Christoph, Anne-Sylvie, Michael, Teppo (VRVS), Aku (VRVS), Wolfgang, Tapio, Teddy, Veikko, Israel, Peter Wittich


Talks on the agenda.

  1. Alexander presented the current population of the CRack with rods. Unfortunately, there are no DS rods available at the moment. They are expected to arrive in December 2005.
  2. Ivan gave a summary on the problems getting the TB reconstruction working with ORCA_8_13_1. He compared the tracking efficiency between ORCA_8_7_3 and ORCA_8_13_0. There were slight differences. Wolfgang mentioned that using a magnetic field different from 0 could cause problems. After the meeting Ivan checked this and found the magnetic filed being set to 0.001 to cure unspabilities in earlier versions of ORCA. When setting this to 0 some mysteriously bent tracks were straightened, but in general only minor changes were observed.
    He also added that the comparison of ORCA_8_13_0 and ORCA_8_13_1 was fine and from now on ORCA_8_13_1 should be used.
    Priority will now be put on a ROOT file output together with Israel and Christoph.
  3. Anne-Sylvie reported how she built the new geometry for the CRack. She added the tilted second rod per layer and was fighting with the ORCA numbering scheme.
    Teddy promised to send the location of the new XML geometry. (which he also did: link)
    Alexander reminded that we have two different types of rods namely H- and L-types, which are different on possition 3 and 5.
  4. Tapio showed the final results of the test beam alignment.
    Aligning the Cosmic Rack with 2 SS rods and 2 partially polulated DS rods resulted in a yet not understood displacement in z-direction. Work ongoing...
    Two DS rods are urgently needed for more tests.
    Next steps: comparison with HIP measurements, move to next ORCA version, improve HIP algorithm
  5. Alexander provided an update to the actions following his talk about the "Validation of Tracker simulation using test-beam results" in the PRS session.
     

 

13. July 2005

Chair: Alexander

Present: Ian, Fabrizio, Giacomo, Martin, Ivan, Oliver, Frank-Peter, Christoph, Anne-Sylvie, Michael, Laurent, Teppo (VRVS), Jorma, Duccio and some people I don't know or forgot (Tracker Week)


Talks on the agenda

 

  1. Ivan explained the story of memory leak sealing within the Testbeam analysis package, which was quite important to be able to analyze large data sets and to guarantee stable operation. One big leak was in CommonDet/BasicDet (Readout::setNoiseInAdcCounts), where for each event and APV a vector of 128x4byte was created but never deleted. Also in DaqReader.cc G3EventProxies were never deleted. A fix is commited and should be implemented in the current ORCA release 8_10_1 and the 8_7_3 version is fixed and intall script works.
    In version 8_10_0 multifile reading is included and Christoph works on the usage of the ExRootAnalysis package for root output files.
    But ORCA version 8_10_0 still has no TrackerReco and Ivan faced a crash with the currently installable version. Maybe missing library or port problem...
     
  2. Teppo reported on the data the Finnish crew took using the CRack. These data are foreseen to be used for alignment studies. The data will be available on CASTOR (/castor/cern.ch/cms/cosmic/tracker/finncrack). He also check the ORCA tracking efficiency, which came out to be 60%. For this he scanned 9000 events by eye and identified tracks. His resulting number was then compared with the number of reconstructed tracks by ORCA . He also showed cases were an obvious track was not found by ORCA. These results were obtained without alignment and also the correct seeding has to be checked!
    As a result of geometry and bad APVs the CRack only provides 6 tracks in 100 triggers.
    The TB software had to be patched to be able to read the data files. Teppo made a web page about this:
    http://www.physics.helsinki.fi/%7Ethmaenpa/FinnCRack/physicsdata.html
     
  3. Alexander reported about the current hardware setup of the Cosmic Rack and opened a discussion about the arrangement of rods. It was concluded that we will start with a configuration, which resambles best TIB (DS,DS,SS6,SS4) +TOB (DS,DS,SS4,SS4,SS6,SS6). This configuration could be changed to one, which allows detailed studies of rod/module displacement using alignment algorithms.
    Readout hardware, cables, PSMs and single-sided rods will be available soon (weeks), but double-sided rods will appear earliest in September.
    He also mentioned the various activities around the CRack and a small overlap was found with the plans for the cosmic challenge which is the simulation of the CRack with cosmics using Drollingers cosmic muon generator, which is available in CMKIN, and Sunandas new xml geometry. The experience gained there can then be used to simulate the objects in the cosmic challenge. But before doing so, one should contact Michele Pioppi, who studied the expected muon rate of the tracker ( see his talk on http://agenda.cern.ch/fullAgenda.php?ida=a054264#s34 ).
     
  4. Then there was a discussion about how to connect the geometrical position of the modules with the DetUnits in ORCA. Oliver tried to explain us what he presented in the Tracker b-tau Cosmic Challenge preparation meeting ( http://agenda.cern.ch/fullAgenda.php?ida=a054264#s34 ) the next day.