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)

D0 Purity Monitor Readout Purity Monitors: 4  -sources ( 241 Am) and 1  -source ( 106 Ru) per cryostat Problem: 106 Ru-sources are 10y old with only t 1/2 =1y Signals: ca. 5fC (30000 e 0 ) over coax cable of 6-15m length 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 241 Am +HV

Hardware PreAmp + 100x amplifier and differential driver 10-Bit 40 Ms ADCs Xilinx FPGA (Spartan XL)CAN-Bus Controller RAM 32k x 24Bit (8ns) Purity Monitors: 4  -sources ( 241 Am) and 1  -source ( 106 Ru) per cryostat Problem: 106 Ru-sources are 10y old with only t 1/2 =1y Signals: max. 5fC (30000 e 0 ) over coax cable of 6-15m length

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 Signal of 5MeV  -particle HV-Curve Extracted O 2 -contamination [ppm]

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 Only choice: buy equipment  ATLAS Local Monitor Box (LMB) ADC: 16 Bit 4Hz with very good filtering Precision achieved at ATLAS Testbeam; 10mK

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

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

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

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

Performance: Linearity 0.2% (DAC  60k)

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