15-Aug-08DoE Site Review / Harvard(1) Front End Electronics for the NOvA Neutrino Detector John Oliver, Nathan Felt, Sarah Harder Long baseline neutrino experiment Fermilab (Chicago) to northern Minnesota (~800 km) ~15 kTon “Far” and smaller “Near” detectors
15-Aug-08DoE Site Review / Harvard(2) Electronics & DAQ Organization L2 Manager – L. Mualem / UC Electronic Project Engineer – J. Oliver / Harvard Front End Boards (FEBs) L3 Manager – J. Oliver Elect Eng – N. Felt Technician / designer – S. Harder Test software – J. Boehm, S. Cavanaugh DAQ, Timing – FNAL ASIC development – T. Zimmerman, FNAL Power Distribution & Slow Controls – UVa
15-Aug-08DoE Site Review / Harvard(3) Readout Hierarchy ~12,000 Front End Boards (~ 1 FEB per 1.2 tons of NOvA detector) running synchronously Each “hit” timestamp synched to Global timing system + pulseheight Global timing system with GPS receiver to correlate timing with NUMI beam spills All data are buffered for ~ 10 seconds awaiting spill window information from NUMI beam line DCM DAQ & Timing FEB GPS Receiver
15-Aug-08DoE Site Review / Harvard(4) DAQ Heirarchy – 64 FEBs to one “Data Concentrator Power Distribution Power Distribution Data Concentrator Data Concentrator FEBs Beam DAQ
15-Aug-08DoE Site Review / Harvard(5) Front End Board (FEB) Architecture APD Module TE Cooler Control ADC FPGA DAQ ASIC Thermoelectric cooler maintains – 15C at APD ASIC integrates & shapes 32 signal channels from APD Selectable risetime & falltime constants ASIC’s 8:1 Multiplexers 16 MHz to sample each channel at 500 ns/sample ASIC’s four outputs are continuously digitized by quad 16 Msps and sent to FPGA ~ 12,000 FEBs in NOvA Far Detector
15-Aug-08DoE Site Review / Harvard(6) TfTf TrTr 8:1 Mux TfTf TrTr TfTf TrTr TfTf TrTr ch NOvA ASIC (T. Zimmerman / FNAL) 16 MHz multiplexers 2 Msps per channel Adjustable risetime & falltime Status Prototypes fabricated on TSMC 0.25u CMOS Tested & work as per simulations 2 nd version now available to work at either Near or Far detectors.
15-Aug-08DoE Site Review / Harvard(7) Signal Processing Use multiple correlated pairs of samples centered on leading edge Separate DSP filters in FPGA (firmware) for Pulseheight Timing Triggering
15-Aug-08DoE Site Review / Harvard(8) Summary & Status of NOvA FEB Flexible architecture : Continuous digitization + DSP 2 MSPS DSO on every channel (Far Detector): Local DSP filters in FPGA Up to 8 MSPS for use in Near Detector (resolve event overlaps) FEB Version 2.0 successfully tested in FY06-07 FEB Version 3.0 Works with NOvA ASIC V2.0 Design completed Jan 08 Project halted due to funding Prototypes to be produced September 08 Testing FY 09 To be used on IPND – Schedule TBD FEB V4.0 May not be necessary if V3.0 meets all specs. (Minor changes to V3.0 V3.1)
15-Aug-08DoE Site Review / Harvard(9) FEB V3.0