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sPHENIX PDR

This document provides an overview of the sPHENIX Calorimeter Electronics system, including preamplifiers, interface boards, controller boards, power distribution, cooling, and radiation studies.

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sPHENIX PDR

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  1. sPHENIX PDR WBS 1.05.02: Calorimeter Electronics Steve Boose April 9-11, 2019 BNL sPHENIX Calorimeter Electronics PDR

  2. Calorimeter Electronics Components • Preamplifiers • Provide amplification, shaping and drive compatible with 60MHz ADC sampling and RHIC cycle time -> 30nS peaking and recovery to baseline within 106nS • High gain channel for resolving MIP peaks during calibration • Interface Boards • Act as analog and digital I/O control interface for preamp operating parameters • Controller Boards • Provide control and readback of all Interface Boards • Include any local algorithms such as current and temperature stability control. • User interface over Ethernet • Local storage for operating constants • Power Distribution • Bulk LV from Vicor MegaPACs • Switchable and monitored distribution using PHENIX LV Distribution system • Cooling • Water cooling loops for SiPM and Electronics (EmCal only) sPHENIX Calorimeter Electronics PDR

  3. System Block Diagram sPHENIX Calorimeter Electronics PDR

  4. System Block Diagram (WBS1.05.03) sPHENIX Calorimeter Electronics PDR

  5. Preamp Front End ZIN vs Freq • Common Base Amplifier input provides very low Zin (~4 Ω ) to mitigate effects due to large source capacitance and SiPM impedance dynamics. • Summing node for low end (DAC) bias adjustment. • Shaper/Driver is a 2nd order multiple feedback filter with 30nS peaking and 106nS recovery to baseline for compatibility with 60MHz ADC sampling and RHIC cycle time. • High gain channel for resolving single microcell peaks during initial calibration. • Differential signal drive for maintaining signal integrity to ADC. • <= one microcell peak noise. • Dynamic range (HCal): Norm Gain 60fC – 875pC, High Gain 37fC – 30pC. 4Ω Total Accumulated Noise 177uV Shaper Microcell Peaks (High Gain) sPHENIX Calorimeter Electronics PDR

  6. Preamps EmCal HCal 16 Chan Preamp (205-1000-2120) SiPM Board (top) (205-1000-2130) SiPM Board FlatFlex Cable (205-1000-3140) (205-1000-2240/1) Preamp (205-1000-3130) sPHENIX Calorimeter Electronics PDR

  7. Interface Boards Backplane(205-1000-3100) HCal Interface (205-1000-3100) EmCal (205-1000-2110) LED Driver(205-1000-3120) sPHENIX Calorimeter Electronics PDR

  8. Calorimeter Controller (205-1000-0110) • Provides monitoring and control for EmCal and HCal Interfaces. • Temperature and leakage stabilizer functions. • One Controller controls up to eight Interface Boards. sPHENIX Calorimeter Electronics PDR

  9. Controller Features Mode Jumpers IP Address Select • Fits into standard VME P1 backplane. • Ethernet jack for remote control. • Micro AB USB connection for System Console access. • 8 isolated I/O channels for sPHENIX Interface Board control. • Onboard 64kB FRAM Non-volatile Memory. • MicroSD memory card interface. • Optional OLED display with cursor controls. • IP Address least tuple rotary selectors. • EmCal or HCal Mode Select jumpers. Cratewide Reset uSD Card sPHENIX Calorimeter Electronics PDR

  10. Bias Compensation • Changes in SiPM temperature and radiation exposure lead to changes in effective SiPM bias. • A 30mV change in bias would result in ~1% change in gain. Bias compensation for each channel is achieved by inserting a DAC voltage at the low end of the SiPM circuit. • For each channel the Controller: • Polls and maintains temperature and leakage current measurements. • Maintains a file of user modifiable gain trim constants. • Combines these factors to drive a 12 bit 0-5V DAC channel. • The bias change due to temperature is calculated by reading the SiPM temperature and applying a nominal coefficient of 60mV/Deg C. • Bias change due to leakage is calculated by measuring bias current and multiplying by total loop resistance (500 ohms typ). (mV) (Deg C) sPHENIX Calorimeter Electronics PDR

  11. Power Distribution PHENIX LV Distribution Board(PHNX-042) Vicor MegaPAC sPHENIX Calorimeter Electronics PDR

  12. Electronics Cooling • PreAmp • 150 watts total per sector • Support structure for electronics • Al plates ~ 1/16” • Thermal interface pad • 1.5mm, Laird Tflex 600 • A12620-34 • Non-conductive electrically • SiPM Loop • 27W per sector Max • 0.030” copper plate • 1/2” copper thermal strap • 0.007” Thermal Tape • (LI98CN-100-100-0.18-0) • Independent cooling loop • Interface Boards • 30 watts total per sector • Thermal interface pad • 2.5mm,Laird Tflex 600,A12624-01 • Non-conductive electrically • Interface board mounted to cooling plate sPHENIX Calorimeter Electronics PDR

  13. Radiation Studies EMCal Interface Board in front of 60Co source • Estimated dosages 1-2 kRad/run @ EMCal • Test components up to 240 kRad, 60Co source at SSGRIF (BNL Instr.) • Tested components and assembled boards: • Regulators • Voltage references • DACs • LEDs • Multiplexers • Interface Boards • Preamps • Results used for component selection 5 x 5 run est. dosage Multiple 4V reference chips that were considered. Multiple 1.8V regulators that were considered. sPHENIX Calorimeter Electronics PDR

  14. Testing and Quality Assurance PC Software Screenshot • Comprehensive automated testing of production circuit boards will enhance quality control and reduce the number of required testing personnel. • Comprehensive testing procedures are being developed • Visual inspection • Burn-in testing • Operational testing • Several Preamp and Interface Testers have been built. • The testers perform a range of static and dynamic tests. • Testers are controlled by distributable PC software over Ethernet. Interface Tester Preamp Tester HCal Test Bay Preamp Under Test EmCal Test Bay sPHENIX Calorimeter Electronics PDR

  15. Safety • All external cabling is UL tray rated and appropriately fused. • All external metal surfaces are to be bonded to ground. • All printed circuit boards are FR-4. • Internal circuit boards are fused. • Bias is nominally 70V but is non-contactable during operation. • LV and Bias is to be interlocked at the local level. sPHENIX Calorimeter Electronics PDR

  16. Back Up Slides sPHENIX Calorimeter Electronics PDR

  17. Control System Structure Calorimeter Controller HCal EmCal HCal Interface Backplane EmCal Interface HCal Preamp EmCal Preamp (16 ch) HCal LED Source LED Pulsed Fiber SiPM Boards SiPM Board sPHENIX Calorimeter Electronics PDR

  18. EmCal System Components(cont’d) Signal Transition Board SL8802 Signal Cables Control/Test Pulse Transition Board sPHENIX Calorimeter Electronics PDR

  19. LED Test Pulse Sources Fiber Diffuser Plug HCal EmCal LED Driver Board LED SiPM Board sPHENIX Calorimeter Electronics PDR

  20. HCal System Components Dual Gain Preamp LED Driver Board Backplane Board 24 Fiber Light Source Plug Interface Board sPHENIX Calorimeter Electronics PDR

  21. Slow Control Modules sPHENIX Calorimeter Controller 96 Channel Test Pulse Fanout Module sPHENIX Calorimeter Electronics PDR

  22. Controller Block Diagram sPHENIX Calorimeter Electronics PDR

  23. Controller Front Panel • Status LED • Ethernet Jack • USB System Console • 8 Isolated RS-485 control channels. sPHENIX Calorimeter Electronics PDR

  24. HCal LED Source • Light output can be remotely compensated for changes due to aging and rad damage. • Monitor and control fits into existing sPHENIX infrastructure. • Fiber is inexpensive and flexible – 1” bend radius. sPHENIX Calorimeter Electronics PDR

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