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D0 Calorimeter Overview - Shifter's Tutorial

This tutorial provides an overview of the D0 calorimeter, including its design, materials, energy resolution, and electronics setup. It also outlines the tasks and responsibilities of a shifter.

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D0 Calorimeter Overview - Shifter's Tutorial

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  1. The RunII CalorimeterNirmalya Parua(For the Calorimeter Group)Shifter’s Tutorial March 17, 2003 • Overview Of the D0 Calorimeter • Shifter’s task

  2. Overview of Detector

  3. Calorimeter Overview Z X Y

  4. Overview of the Calorimeter • Liquid argon sampling • Stable, uniform response, rad. hard, fine spatial seg. • LAr purity important • Uranium absorber (Cu or Steel for coarse hadronic) • Compensating e/  1, dense  compact • Uniform, hermetic with full coverage • |h|< 4.2 (  2o), l int > 7.2 (total) • Energy Resolution • e: sE / E= 15% /ÖE+ 0.3% p: sE / E= 45% /ÖE + 4% (RunI numbers, RunII is somewhat worse now, and we don’t have the final result) For more details # The D0 Detector ("The NIM paper") Nucl. Instr. and Methods, A338, 185 (1994) FERMILAB-PUB-93/179-E PS

  5. Overview of the Calorimeter L. Ar in gap 2.3 mm Drift time 430 ns Ur absorber Cu pad readout on 0.5 mm G10 with resistive coat epoxy

  6. Overview of the Calorimeter

  7. Intercryostat Detector (ICD) FPS ICD • Design • Scintillator based with phototube readout . • 16 supertile modules per cryostat with a total of 384 scintillator tiles • WLS fiber readout of scintillator tiles • Clear fiber light piping to region of low field ~40-50% signal loss over 5-6m fiber. • Readout/calibration scheme for electronics similar as for L. Ar. Calorimeter .

  8. Readout preamp driver SCA(48 deep) FET 2” Cable replaced for impedance matching Bank 0 Trig. sum Calibration SCA (48 deep) peak SCA (48 deep) x1 Filter/ Shaper Preamp/ Driver base x8 Calorimeter SCA (48 deep) SCA (48 deep) Bank 1 1 48 A D C A n. Bu f f 55k readout channels

  9. Preamplifier preamp driver • Dual FET Frontend • Compensation for Det. Cap. • Faster Recovery Time 2” New calorimeter preamp • Hybrid on ceramic • 48 preamps on a motherboard • New low-noise switching power supplies in steel box 55296 hybrids 1152 boards FET New output Driver for terminated signal

  10. Base Line Subtracter (BLS) 23440 SCAs 4608 SCA cards Trig Summers Trigger summers/Drivers 1152 BLS boards ADC’s have 12 bit dynamic range. To achieve 15 bit dynamic range SCAs have low and high gain path for each readout channels (X8/X1) SCAs are not designed for simultaneous read/write operations. Two banks of SCAs, upper and lower (can’t see in the picture), for alternate read/write operation. Readout time ~6 µs (length of SCA buffers 132 X 46 >6 µs). Trigger tower formation 0.2 X 0.2 for Level 1.

  11. More on SCA’s                                 …. ….                                  ADC counts   L1 SCA up   … …     L1 SCA down L2 SCA x8 down L1 SCA     up    x1 L2 SCA  ADC Mean value

  12. T&C cards Timing and control Card Trigger system Pulser Calorimeter BLS ADC Preamplifier • Receives trigger, accelerator, clock information • Samples BLS shapers at the signal peak and base. • Keeps track of the memory location of crossings. • Generates busy signal when system is not ready. • Coordinates pulser calibration. 12 T&C boards and 1 controller board is used

  13. Shifter’s task www-d0online.fnal.gov -> Group Managed web pages -> Cal

  14. Shifter’s task

  15. Shifter’s task

  16. Shifter’s task General: Locate the monitors and orient yourself. Open/login to the electronic logbook Recognize/start all calorimeter monitoring GUIs Fill out the checklist in a timely manner. Make sure archiver is running Check the status of the FPDs.

  17. Shifter’s task • When There is beam and we are in Global running • Make sure that all low voltage and high voltage supplies are on and working. • Reset any tripped supplies. • Set to data taking mode and download pedestals- cal_prepare_for_run. • Make sure that the pulsers are off. • Make sure all modes are set correctly. • Run the examine and L1cal_examine, identify hot cells and hot trigger towers. • Kill hot cells in the precision if needed, if there are hot trigger towers notify L1cal expert. • Paste examine plots in the logbook. • If any supplies trip, record trip parameters and reset the trip. • At the end of every runs stop the examines, at the beginning of runs start those. • Monitor the FPD running. • At the end of run record the run information in the database and logbook. • Place the FPD to standby before the end of the store.

  18. Shifter’s task • During quiet time • Remove the cal crates from Global run and take pedestal calibration run • Verify power supplies are off and working. • Verify pulsers are off. • Set the T&C system to fixed cell mode. • Check the calibration manager is running • Start the taker, select the trigger file, and take the runs. • Make sure the modes are set correctly • Enter the run parameters both in the logbook and in the database • Edit the trigger file and make the download file • Check the output, if satisfactory convert into the correct format and download. • Run a zero bias run and identify hotcells, kill if necessary • When there is no beam • Run Cal examine and L1cal_ examine to find any problem. • Take any special runs that were requested.

  19. Shifter’s task >start_cal alarm

  20. Shifter’s task >start_cal global >start_cal ioc >start_cal rmi

  21. Shifter’s task >start_cal supply

  22. Shifter’s task Rightclick

  23. Shifter’s task

  24. Shifter’s task

  25. Shifter’s task

  26. Shifter’s task Everything should be 0 during data taking.

  27. Shifter’s task

  28. Shifter’s task >start_cal tandc

  29. Shifter’s task >start_cal pulser

  30. Shifter’s task >start_cal hv

  31. Shifter’s task Cal_examine’s output, Any hotcells are written automatically after 1000 events

  32. New video shifter’s guide is being made that should orient the shifter and give them better feelings about the detector. Preview can be seen at http://vmsstreamer1.fnal.gov/VMS_Site_02/Training/DzeroShifter/DzeroShifter2.htm

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