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HCAL Calibration and Monitoring Tile HCAL technical review Erikas thoughts presented by me

HCAL Calibration and Monitoring Tile HCAL technical review Erikas thoughts presented by me. Write protected. Read/Write protected. Binary RAW. LCIO uncalib. LCIO for analysis. LCIO RAW. Binary/ LCIO 1:1 converter. Apply calibration. Apply: Mapping Ped subtraction. Data Base.

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HCAL Calibration and Monitoring Tile HCAL technical review Erikas thoughts presented by me

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  1. HCAL Calibration and MonitoringTile HCAL technical reviewErikas thoughts presented by me

  2. Write protected Read/Write protected Binary RAW LCIO uncalib LCIO for analysis LCIO RAW Binary/ LCIO 1:1 converter Apply calibration Apply: Mapping Ped subtraction Data Base Start global calibration program: Identify trigger type and calculate: LED monitoring value MIP / Gain / Temp calibration DAQ Online display sync? t-sync Slow to LCIO or only to DB? Online display

  3. Calibration & Monitoring Tasks • Mapping  Database • Pedestal monitoring  continuous • LED monitoring • Electronics calibration • Slow Control calibration @ run start • SiPM Gain calibration • MIP calibration  long term

  4. I. Mapping !! z ≠ # cassette •  slot fe chip chan x y z • slot: address of VME card, # of slot (5 cards) • fe: VME channel input 1-8 (or 0-7?) • chip: VFE-boards 1-12 (or 0-11?) 1728 • chan: multiplexed channel 1-18 (or 0-17?) • #SIPM  x y #cassette • #cassette z (38 entries)

  5. II. Pedestal monitoring • All times are calculated for 100Hz DAQ • 100 pedestal events every 1000 beam events • continuously during all type data taking • physics mode • 1/10 data volume • time: 1 sec • Check pedestals during/outside spills to compare LED monitoring with beam data • Pedestals in calibration mode during SiPM gain calibration

  6. III. LED monitoring • Task: check stability of MIP calibration • LED events in between spills (~3 sec time) • possible only in physics mode (signal ~ 1 MIP) see Erikas talk • 1000 events every 3-5 minutes (?) + 100 pedestal • 3-5% of data volume • 5-8% dead time • Readout also PIN diodes  3/38 VFE boards ~ 8% of total data

  7. IV. Electronics calibration • Direct charge injection in calibration and physics mode @ the beginning of run • frequency: beginning of run • # events : 1x103 • Time: 2 min

  8. V. Slow Control calibration • Calculate calibration factor for Temperature & Voltage variation  one measurement / min (?)  synchronization of SC to data in LCIO / in DB  average various SC measurement ?

  9. VI. SiPM Gain calibration • 1000 low LED flash events + 100 pedestal events @ beginning of run • calibration mode • # events: 1x105 • time: 20 min • ~1% statistical error • Apply gain variation correction (?)  crosscheck to Slow Control & LED corrections

  10. VII. MIP calibration Calculate MIP calibration factor weekly/monthly  calibration mode - hadron beam + brick or broad muon beam:  # events: 5x6 105 , time: 8-10 h  <5% statistical error - cosmics  # events: 1x105/tile ~ 4x107 , time 4-5 days  ~1% statistical error

  11. Open questions • Trigger information→ stored in LCIO header? • Distinction between data taken in calibration or physics mode → flag in LCIO header? • Synchronization of Slow Control data? • Next steps fix calibration naming scheme fix collections and modules name scheme Start software development !!!

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