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RICH Update

Jianchun Wang Syracuse University 10/16/99 CLEO Meeting. RICH Update. Outline DAQ problems solved Recent results Status of DAQ Work to be done. DAQ Problems Solved. Software problem Corrupted data DAQ bug, results in digital +2 V not set Hardware problems in digital data boards

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RICH Update

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  1. Jianchun Wang Syracuse University 10/16/99 CLEO Meeting RICH Update • Outline • DAQ problems solved • Recent results • Status of DAQ • Work to be done

  2. DAQ Problems Solved • Software problem • Corrupted data • DAQ bug, results in digital +2 V not set • Hardware problems in digital data boards • VME buffer/driver destroyed( 14 boards affected ) • Wrong VME and Sequencer code • ADC buffer damaged ( 20 boards affected ) • Buffer enable conflict • Timing problem • Wrong timing caused wrong ADC to be read out Jianchun WANG, Syracuse University

  3. Corrupted Data • Noise expected to be 3-4 ADC counts (~500 e) • DAC address 0-3 was shifted to be 1-4 • Effectively digital +2V not set • Bug fixed and noise as good as expected • Parameter monitor and alarm working now Pedestal RMS (ADC counts) Jianchun WANG, Syracuse University

  4. Noise Performance • Each crate checked, no problem with CC and cable • Half cylinder tested simultaneously with repaired boards • Total noise ~ 3.6 ADC counts • Incoherent noise ~ 2.6 ADC counts (400 e) Jianchun WANG, Syracuse University

  5. Parameter Monitor • Parameter monitor: Voltages, Bias currents, Temperatures • protect data board, chamber, ensure data quality • Readout via SBUS • By Bayar & Jian • Auto measurement and alarm implemented • Need to integrate into main slow control and alarm system ****************************** * Crate: 123 Board: 4 * * Board ID: RICH ANALOG A025 * ****************************** ** Board values** Ch. 0 -> +5 analog: 480 4.996 V Ch. 1 -> -5 analog: 343 -5.191 V Ch. 2 -> +2 digital: 470 2.460 V Ch. 3 -> -2 digital: 477 -2.543 V Ch. 4 -> board temp: 509 25.224 C Ch. 5 -> cal pulse: 615 0.097 V ** Cell values** Ch. 0 -> +2 analog: 524 2.013 526 2.015 526 2.015 V Ch. 1 -> -2 analog: 216 -2.288 213 -2.291 214 -2.290 V Ch. 2 -> Vfp: 625 -0.486 628 -0.483 630 -0.480 V Ch. 3 -> Vfs: 688 0.673 682 0.667 685 0.670 V Ch. 4 -> Vref: 472 -0.673 474 -0.671 479 -0.665 V Ch. 5 -> prebias: 634 0.494 644 0.502 594 0.463 mA Ch. 6 -> shabias: 298 0.023 321 0.025 325 0.025 mA Ch. 7 -> iBuf: 0 0.000 1 0.000 1 0.000 mA Ch. 8 -> thermistor: 544 22.110 541 22.375 542 22.287 C Ch. 9 -> ADC offset: 741 1.811 741 1.811 740 1.808 V Jianchun WANG, Syracuse University

  6. Data Boards Jianchun WANG, Syracuse University

  7. ADC Buffer Problem • ADC readout difference is small within one chain with no front end electronics connected • Difference of 256 suggests that bit 8 may be wrong • Buffer damaged and bits shorted • Wrong buffer enable before initialization and during reprogramming • All 20 boards repaired ; all digital boards modified pull-up resistor array Jianchun WANG, Syracuse University

  8. Timing Problem • Wrong buffer timing or FIFO timing may cause wrong ADC selected (duplication, rotation ) • Test chain with no CC4 used to check all boards • 4 boards found such problem • All boards are adjusted Jianchun WANG, Syracuse University

  9. Wirepulse Calibration • Calibration pulse sent to anode wire and measure induced charge • Half cylinder shown here • Signal height quite uniform • Dead channels 0.4% Jianchun WANG, Syracuse University

  10. Plane Radiator Jianchun WANG, Syracuse University

  11. Jianchun WANG, Syracuse University

  12. Status of DAQ • DAQ version 9902 and 9904 were used in the runs shown • Version 9902 uses only software trigger on TIM, so two crates can not be triggered simultaneously • Version 9904 use DFC and GCAL send trigger to TIM, configuration manager not function • DAQ version dlib (Y2K) has a successful run on two RICH crates. More functions need to be tested. • More details, see Todd’s talk Jianchun WANG, Syracuse University

  13. Work To Be Done • Read out all RICH crates with new DAQ system • Measure pedestal, noise performance and wirepulse calibration to find any remaining problematic boards • Test new DAQ functions including single channel calibration and data sparsification • Continue coding on online monitor • Determine the mode for big calibration • Cosmic ray run Jianchun WANG, Syracuse University

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