Online Calibration of Calorimeter

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

• Accumulate 0 bias data for each CAL cell with
  events
• empty for Pedestals
• pulsed for Pulser runs
• Goals

4
Calibration System
Level 3
5
Calibration Pulser System

• (LAL Orsay, LPNHE Paris)
• 
  
  
• 12 units for calorimeter 1 for ICD
• ? smallest calibration unit 1 ADC crate

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Pulser Control
PULSER
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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 Calibration cal_elec runs 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
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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
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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
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

ScriptRunner
Calibration Data D0OM object
L3FCalCalib
l3filters
Write(L3DebugInfo)
L3CalCalibDebugInfo friend class L3CalCalib
L3CalCalib
RunCalib()
L3 Tool for calorimeter online calibration
Data To Host
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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

15
Calibration Procedure

• Contents of calibration data
• Header ?
• (1) Run Number, Run Date
• By Channel ?
• (2) Packed Channel ID (CrateCardBLSTwrDpth)
• (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) lt4? of previous value Good channel
• (2) 4? to 10? of previous value Flag warning
  for channel
• (3) gt10? is Bad channel
• If significant number (gt50) of channels in a
  crate are bad

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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