LArTPC Electronics Review ------------------------- - Physics Motivation large detectors are what matter - Cost Control General Layout Save a Box - Filtering why not in digital or offline slope dependent waveform - on site assembly - History - Why - Other Systems: boards, pictures, events - Concerns: e.g. clocks - What We're Doing - Engineering: Filtering, Data Compression (coding, roi), Triggering, Beam Spill vs Always Alive - Physics Results - Characterize parts - Graphs: Signal, Mux Output, Filter Sources: - Schematic sheets - Mux Output temp_313e.ps adaptor ?? what is this Goals FET Test Stand Picture ? Low Temp Components: just don't wokr, subtle, circuit implications Test Setup Signal Levels 3 boxes down to 2 boxes Filters at the feedthrough Clocks Things to take: --------------- 3 x boards Pictures of T962 Pictures of comp test stand and setup Events Core, Capacitor, Resistor, Engineering: ------------ - Filter of hit data - Data compression: ROI, Coding - Triggering: Beam spill vs always alive Physics Results Plots: - Filter Output - "Real" signal output <--- Don't have see page 107 - Multiplexer Output Schematics: - PreAmp sch - Filter Block - Filter sch - Mux sch - Line Driver sch - Control Signal Receiver sch - Mux Digital Control Describe signals on the cable ========================================== History of the MSU LArTPC Electronics Work Small warm DAQ system for the Bo LArTPC Warm DAQ system with cold Bias Voltage distribution for the ArgoNeuT LArTPC About a year ago Stephen Pordes asked us to work on a small multiplexed readout that could run cold Goals and Motivation for the Current Work Test it in the Bo LArTPC and then use it for a long TPC in the LAPD cryostat Gain experience with multiplexed readout and cold electronics reduce cost Project Sections: Preamp Filter Multiplexer Line Driver Digital Control of the Multiplexer Firmware for the "ADF-2" VME Readout Card 4 layer with ground plane fill on all layers double via connections relieved ground plane under Hi Z traces Compromize size vs ease of modification In a big LArTPC what is ground and is 1 or 2 mm of stainless steel enough shielding ? Designs without big capacitors Intergrated Engineering Design Study DAQ Electronics with Mechanical DAQ Electronics with Cryogenic Design Considerations Operate at RT or LN2 temperature without significant adjustment Single twist-flat cable going inside: 4 differential analog readout signals 2 differential digital control signals 3 powers supplies (6 conductors) 8 grounds (16 conductors) Control electrical Noise inside the cryostat ========================================== /opt/staroffice7/english/program/soffice & ========================================== more /etc/passwd last | head -n 20 ls -l /etc/*pass* ls -l /var/log/ ========================================== Engineering Comments If Fermi is going to be involved with the DAQ system for a big LArTPC (e.g. LBNE) the electrical engineering for this system should start soon. Technical Challenges Cost Control Remote Assembly and Operation This DAQ engineering needs to be integrated with the mechanical and cryogenic engineering. We should "prove" that a fully thought out warm electronics design will not work before committing to put "all" the electronics inside. As far as I know the HEP community has no examples of running a system for 10 or 20 years without needing to work on the electronics. It's a one detector experiment A thin wall stainless steel vessel will not shield electrical noise. There is no "ground" inside and there is no shield inside. Need a respected noise Czar early (e.g. now). Lots of room for design work Filtering of hit data digital or offline slope dependent waveform raw data beauty vs information content Data compression: ROI readout, Coding Triggering: Beam spill vs always alive Low Temp Components: just don't work, subtle, circuit implications http://www.pa.msu.edu/~edmunds/LArTPC/Talks/Talk_Feb_2010/