CSC - OHP histograms

There are four tabs

• Shifter_ROD_Status There are three histograms in this tab. In case of NO errors only the first histogram is present and the situation is good
  • CSC Status gives the CSC ROD status. The first bin reports the number of events and the second bin reports the number of events with large hits. Other bins: If >10% ROD errors or ROS events are present a CSC expert should be contacted. Normally there are only a small fraction of errors if any.
  • ROS Events (bad) per Sector shows the CSC sectors with isROS events isROS events are bad. If any sectors have significant entries (> 10% of total events) a CSC expert should be contacted. Normally this histogram is empty or has only a small number of entries.
  • RPU Errors (bad) per Sector shows the CSC sectors with RPU errors. RPU errors are bad. If any sectors have significant entries (>10% of total events) a CSC expert should be contacted. Normally this histogram is empty or has only a small number of entries. Presently, June 2012, there are a number of RPU errors in sector 10 on the A-side. This is acceptable.

• Shifter_CSC_Layer_Maps_Prec
  • Precision Layer 1-4 Sector Occupancy These four histograms show the occupancy for each precision layer (the four histograms) of all sectors (x-axis) of the CSC system. The A-side sectors are > 0 and the C-side sectors are < 0. The sectors alternate between Large and Small chambers thus giving rise to the alternating structure in the histograms. Currently there are three dead precision layers in the CSC. These are CSC (side, sector,layer) of (A, L5, 3), (A, L9, 1) and (C, L3, 2). There are very few entries in these particular bins. The bin at 0 just separates the C-side from the A-side. If any new "dead" layers appear, contact a CSC expert.

• Shifter_CSC_Layer_Maps_Trans
  • Transverse Layer 1-4 Sector Occupancy These four histograms show the occupancy for each transverse layer (the four histograms) of all sectors (x-axis) of the CSC system. The A-side sectors are > 0 and the C-side sectors are < 0. The sectors alternate between Large and Small chambers thus giving rise to the alternating structure in the histograms. Currently there are three dead precision layers in the CSC. These are CSC (side, sector,layer) of (A, L5, 3), (A, L9, 1) and (C, L3, 2). There are very few entries in these particular bins. The bin at 0 just separates the C-side from the A-side. If any new "dead" layers appear, contact a CSC expert.

• Shifter_CSC_ADC_time
  • Cluster Charge on Good Segments - A Side and - C Side show the total charge of CSC clusters on CSC segments for the A and C sides. Expect to see a Landau distribution. If a Landau-like distribution is not observed, please contact a CSC expert.
  • Cluster sampling time on Good Segments -A Side and -C Side show the sampling time for clusters on good segments for the A and C sides. Expect to see a guassian distribution with width approximately 70 ns. If a gaussian-like distribution is not observed please contact a CSC expert.

• Shifter_CSC_Occupancy_Prec_vs_LumiBlock
  • Precision Layer 1-4 - Sector Occupancy vs LumiBlock shows the occupancy in each precision layer (4 histograms) for each sector (y-axis) as a function of lumiblock. If a new CSC (sector,layer) drops out during the run it should appear as small number (cooler color) after some point in lumiblock history. That is, the color of some (sector,layer) would change after some lumiblock during the run. If there are no entries it probably means there was no Stable Beam in that period.

• Shifter_CSC_Occupancy_Trans_vs_LumiBlock
  • Transverse Layer 1-4 - Sector Occupancy vs LumiBlock shows the occupancy in each transverse layer (4 histograms) for each sector (y-axis) as a function of lumiblock. If a new CSC (sector,layer) drops out during the run it should appear as small number (cooler color) after some point in lumiblock history. That is, the color of some (sector,layer) would change after some lumiblock during the run. If there are no entries it probably means there was no Stable Beam in that period.

CSC - DQMD

• Outline
  • The DQRegions are laid out according to the following scheme CSC -> CSCEA/CSCEC -> Sector -> DQAlgorithm
  • The flag merging algorithm is WorstCaseSummary: A red/yellow flag in any single DQRegion will propagate up to the next level. This means that if a single DQAlgorithm returns a red/yellow flag the overall flag for the CSCs will be red/yellow
  • There are currently four DQAlgorithms. They are described below

• Event Status Flag
  • Calculates the ratio of bad events ( isROS events or RPU status bad events ) to total events for each individual sector from Event Status Histograms . Throws a red flag if ratio > .01

• Landau Fit Flag
  • Performs a Landau Fit on Cluster Charge Histograms for each individual sector. Compares the Fit MPV value to a threshold value (250 ADC). Throws a flag based on the value of the fractional difference between the two. Green < .5 < Yellow < .7 < Red

• Segment Occupancy Flag
  • Performs a simple check to ensure the Cluster Occupancy Histograms are not empty. Throws a red flag for sector corresponding to empty bin. Dead layers have been accounted for.

• Segment Efficiency Flag
  • Calculates segment efficiency for each individual sector from Segment Efficiency Histograms . Throws a red flag if the segment efficiency falls below .25. Dead layers have been accounted for.

Please contact the CSC expert in case of problems.

-- FionnbarrOGrady - 08-Jun-2012