More crap

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Morecrap

• Nigel Nation
• BU ATLAS Group Weekly Meeting
• 29 April 2008

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• Run 33182 (Dec 4 2007)?
• castor/cern.ch/grid/atlas/t0/perm/DAQ/MuonWeekDec0
  7/
• 169 files (Transfer problem number 50)?
• TGC sectors 9,10 and 11 were on.

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• First pass of raw data uses a Hough Transform to
  remove spurious hits.
• 2nd pass uses a scalable least squares algorithm
  allowing up to 12 tubes hit.
• This allows for an acceptance angle of 80 degrees
  perpendicular to chamber surface (1.3p
  steradians)
• No method to remove d-rays or outliers
• Data stored in structured root file for
  reprocessing
• Data file can be opened and viewed with
  self-written OpenGL event display.

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• Alignment with tracks
• Currently MOORE does not make tracks between
  chambers, only between stations (EM-EI, EM-EO)?
• Need tracks in adjacent chambers
• 2D chamber alignment
• translations in local chamber coordinates z y
• rotations about x axis
• can be done between small and large chambers
  without TGC information
• 3D chamber alignment
• 6 A-line parameter comparison
• This needs understanding of TGC 2nd coordinate
• Requires alignment of TGCs relative to MDTs

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• Run 33182 (Dec 4 2007)?
• TGC

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• Run 33182 (Dec 4 2007)?
• TGC sectors 9,10 and 11 were on.
• EMS.1C12 is triggered by TGC
• No double pulses seen in TDC spectrum (Andrew
  Eppig)?
• Use RAW data files and filter leaving only 6-tube
  6-row events
• Use Hough Transform to locate tracks
• Only looking at 6 hits

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14849441
14230657
621967
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• Histogram is being incorrectly filled. As a
  result the peak is incorrectly found. Currently,
  top plot (previous slide) bin size is 5 where as
  bottom is 1.
• Second pass of program locates peak from first
  histogram and expands about its peak. This is why
  it is failing.
• This results in incorrectly found track along
  with its associated hits

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• Hough does not pick out correct track
• Bins are set incorrectly

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• Hough Transform is not working and need to
  generate track residuals.

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• Modify Hough Transform to get tracks and
  residuals?
• Modify least squares to deal with more that 6
  tubes hit?
• Intention to be able to look at residuals
  independently of MOORE. The intention is to
  compare the two results BOTH the raw hit data and
  the segments data.
• Look at delta-ray production.

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• http//homepages.inf.ed.ac.uk/amos/hough.html