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Online Calibration of Calorimeter Mrinmoy Bhattacharjee SUNY, Stony Brook

Detailed insight into the calibration procedures of calorimeter electronics, discussing calibration software, online database, and commissioning techniques, aims to achieve high precision calibration for optimal performance.

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Online Calibration of Calorimeter Mrinmoy Bhattacharjee SUNY, Stony Brook

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  1. Online Calibration of Calorimeter • Mrinmoy Bhattacharjee • SUNY, Stony Brook • Thanks to: D. Schamberger, L. Groer, U. Bassler, • B. Olivier, M. Thioye • Institutions: SUNY, LPNHE-Paris, LAL-Orsay, Columbia

  2. Overview • Topics discussed • Calibration of the Electronics • -- Procedure • -- Pulser Hardware • Online Calibration Software • -- Pulser control software • -- Calibration software • -- Validation software • Online Calibration Database • -- Table definitions • Summary

  3. Motivation Trig. sum Bank 0 Calibration SCA (48 deep) SCA (48 deep) x1 Filter/ Shaper Output Buffer Preamp/ Driver SCA BLS x8 Calorimeter SCA (48 deep) SCA (48 deep) Bank 1 • Accumulate ‘0’ bias data for each CAL cell with events • — empty for Pedestals • — pulsed for Pulser runs • Goals: • Calibrate electronics to better than 1%: • 1. Measure Pedestals due to electronics & Ur noise • 2. Determine 0 suppression limits • 3. Study channel to channel response variation • 4. Study linearity • Calorimeter electronics commissioning: • 1. bad channels • 2. trigger verification • 3. mapping

  4. Calibration System Taker Online Calibration System Configure Request start run Commit, Abort Calib Manager GUI COOR Calibration Manager Start run Status End Run Comparison Results Pedestals Gains Validator COMICS Pedestals Gains Database Interface Start run Database Access Crates Data Calib. Data Processor Calibration Database Level 3

  5. Calibration Pulser System 6 commands (3x2) 96 currents PIB Trigger Pulser Preamps box Power supply 2 Fanout (2x3x16 switchs) switch • (LAL Orsay, LPNHE Paris) • 12 units for calorimeter + 1 for ICD •  smallest calibration unit = 1 ADC crate

  6. Pulser Control GUI for pulser setting TAKER COOR data block structure COMICS EPICS Hardware database VME address of RAM registers VBD PIB program and protocol structure L3 event header PULSER

  7. Pulser Control • Pulsers Configuration to download: • signal height (DAC) • Enable for each pulser channel (patterns) • Commands • Delay • Calibration loop parameters: • linearity/timing • number of events per step • step size • pulser patterns

  8. Pulser Status • Pulser Status • -- Pulser boxes built, tested and installed • -- One final Pulser supply built • (rest to be built in next 2 months) • -- Fanouts and cables installed for ECN and CC • (ECS in Oct.) • -- Pulser Interface Board (PIB) - prototype tested • (Final version being built) • Software Controls • -- GUI can talk directly to PIB through EPICS or COMICS • -- can talk to Pulser in MCH via COOR by hand • -- working on link between GUI and COOR

  9. Calibration software for DAQ commissioning • Version of Calibrationcal_elecruns on online HOST • (since Feb, 2000 part of commissioning milestone) • grabs data from distributor • calculates , /channel • reports running , /channel • prints status report • being used to debug CAL crates Pedestal run Sigma tails from preamp capacitance

  10. Calibration Tool for Level 3 • Online Calibration Code will run at L3 • -- will handle data for 12 ADC crates • -- pulser block PIBtiming/controlL3 (VBD ) • defines DAQ set, Delay, Pls pattern etc. • -- access to raw data from ADC Crates (VBD ) • -- calculates  for each channel for  Gains • . • . • . • . 12 ADC Crates L3 nodes L3CalCalib Crate 1 L3CalCalib Crate 12 Data from 12 ADC crates

  11. Calibration Tool for Level 3 • l3CalCalib is implemented as an L3 Tool • --l3CalCalib is an unpacking tool • -- will run as a Filter • L3CalCalib contains the L3 tool implementation • (1) Pseudo-constructor MakeMe() • -- initializes containers for data • (2) DoThisTool() • -- runs L3CalCalib tool • -- passes RawData chunk to _RunCalib(rawptr) • (3) _RunCalib(rawptr) • -- forms running sums and fills contsiners • (4) Write(L3DebugInfo ** myinfo) • -- calculates  for each channel when called by • ScriptRunner • Containers for Calibration data • 12 instances of CalCalib_AdcCrate class • 12 instances of CalCalib_AdcCards • 384 instances of ADC Channels • (BLS,Tower,Depth,,)

  12. Calibration as a Filter • L3CalCalib tool needs to be called as a filter at L3 • --  tool needs to be registered • --  needs to be declared in tools.rcp • --  implemented as a filter (L3FCalCalib) in l3filters • -- needs to be registered as a filter • --  needs to be declared in filter.rcp • Then ScriptRunner can instantiate this filter • L3 does not have an end of run • So,when do we calculate the moments (we have running sums -- running moments hard on resources )????? • L3DebugInfo can be called from the ScriptRunner • every ‘N’ events • invokes Write(L3DebugInfo ** myinfo) in L3CalCalib • copies calibration data into L3CalCalibDebugInfo class • packs into persistant D0OM object to ship to Host

  13. Controlling Calibration at L3 • L3CalCalib, L3CalCalibDebugInfo, L3FCalCalib implemented • Being tested as a L3 filter in tsim_l3 ScriptRunner Calibration Data D0OM object L3FCalCalib l3filters L3CalCalibDebugInfo friend class L3CalCalib; Write(L3DebugInfo); L3CalCalib RunCalib(); L3 Tool for calorimeter online calibration Data To Host

  14. Calibration Procedure • Calib Taker starts Calibration Run • Through Configuration files • (1) Turn off ‘0’ suppression • (2) Turn off Pulser for Pedestal runs • number of events to trigger • (3) Set Pulser for Pulser runs • number of events to trigger • select DAQ setting • select Delay setting • Cycle through all patterns •  we end up with one set of calibration constants per run • Ramp through all DAQ, Delay settings and cycle through • all patterns to check linearity of the response • within the same run or in different runs • we will end up with Ramp sets of calibration constants • Calibration constants are then sent for validation and data base • to the host as special events (D0OM).

  15. Calibration Procedure • Contents of calibration data • Header  • (1) Run Number, Run Date • By Channel  • (2) Packed Channel ID (Crate+Card+BLS+Twr+Dpth) • (3) Mean for 1 and 8 (for pulser runs only 1 number) • (4) Sigma for 1 and 8 (for pulser runs only 1 number) • (5) 16 bit error code • (6) Pulser pattern number • Calibration data committed to Data Base by ADC Crate • Calibration Data validated with valid runs in Data Base • Following Error flags set per channel • (1) <4 of previous value Good channel • (2) 4 to ~10 of previous value Flag warning for channel • (3) >10 is Bad channel • If significant number (>50%) of channels in a crate are bad • we Flag error for the whole crate and may not commit to Data Base

  16. Summary • * Pulser Hardware Installed • * Communication with Pulser through • COOR being worked out • * L3 Calibration TOOL written as a L3 Filter • * Being implemented in L3 framework and tested • * Data Base tables defined • (more to be added) • TO DO  • — Complete Pulser communication • — Migration of Calib code to NT -- mid October • — Integrate Data Base tables -- mid October

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