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Mainz: Contributions to the LArg-Calorimeter

Mainz: Contributions to the LArg-Calorimeter. Purity monitoring of the liquid argon and temperature measurement in the three cryostats - Old electronics had to be replaced - System developed for ATLAS was suitable with some modification - Read-out of 30 PT-100 per cryostat

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Mainz: Contributions to the LArg-Calorimeter

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  1. Mainz: Contributions to the LArg-Calorimeter Purity monitoring of the liquid argon and temperature measurement in the three cryostats - Old electronics had to be replaced - System developed for ATLAS was suitable with some modification - Read-out of 30 PT-100 per cryostat - Required Software: - Firmware (Xilinx FPGA) - Front-End Software (LabView) - EPICS to communicate with HV-crate controller and with DAQ - Python for visualization in Control-Room Online-Calibration (in collaboration with french groups from Orsay and Paris) - Python code to control calibration pulsers - GUI to set DAC value, ramp ... - Tools for debugging/monitoring of the calibration boards and crates (including GUIs)

  2. 241Am D0 Purity Monitor Readout • Purity Monitors: 4 -sources (241Am) and • 1 -source (106Ru) • per cryostat • Problem: 106Ru-sources are 10y old with only • t1/2=1y • Signals: ca. 5fC (30000 e0) over coax cable of • 6-15m length +HV • Special PreAmp needed  V.Radeka (BNL) • Boost signal before digitization • Different cable length leads to different noise • levels  need adaptable shaping/triggering Solution: shaping, triggering and histogramming done in a Xilinx SpartanXl FPGA

  3. PreAmp + 100x amplifier and differential driver 10-Bit 40 Ms ADCs RAM 32k x 24Bit (8ns) CAN-Bus Controller Xilinx FPGA (Spartan XL) Hardware • Purity Monitors: 4 -sources (241Am) and • 1 -source (106Ru) • per cryostat • Problem: 106Ru-sources are 10y old with only • t1/2=1y • Signals: max. 5fC (30000 e0) over coax cable of • 6-15m length

  4. Extracted O2-contamination [ppm] Signal of 5MeV -particle HV-Curve Results from Nov/Dec. Test • First setup for purity readout tested in Nov./Dec. • (build within 3 weeks!) • Read-out of a single -source and 16 PT-100

  5. Calorimeter Temperature Read-Out • Each of the 3 cryostat equipped with 270 PT-100 (2-wire) • Mainz agreed to read 30 T-probes per cryostat in Oct. 2000 • Only choice: buy equipment  ATLAS Local Monitor Box (LMB) • ADC: 16 Bit 4Hz with very good filtering • Precision achieved at ATLAS Testbeam; 10mK

  6. Final PT-100 read-out • 30 PT-100 (2-wire) read out per cryostat by 3 LMBs (ATLAS) • 24hour history available on web page d0olnt04/show24h.htm Endcap South Central Endcap North

  7. D0 Pit Box containing Purity Monitor and PT-100 readout CAN-Bus (60m) Movable Counting House (MCH) to DAQ Ethernet

  8. Online Calibration • Pulser system to inject defined charge into • calorimeter PreAmp •  intercalibration of calorimeter cells •  dead channel detection •  calibration of gain1 and gain8 •  understand effects of Baseline subtraction (BLS) •  first guess for absolute energy scale • GUI development for calibration pulser (Python code) • Control of •  DAC value •  calibration ramps •  timing delays •  commands for calibration crates

  9. Output Buffer SCA BLS SCA (48 deep) SCA (48 deep) SCA (48 deep) SCA (48 deep) Bank 0 Bank 1 Calorimeter Electronics x8 x1 Filter/ Shaper Trig. sum Preamp/ Driver Calibration Calorimeter

  10. Performance: Linearity 0.2% (DAC  60k)

  11. Time & Control Board Monitoring • Monitoring and debugging of the calibration boards/crates • GUI to read/write values to registers on the TC board

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