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DAQ Considerations For Increased Rep. Rate

This document outlines key considerations for optimizing data acquisition (DAQ) systems to achieve increased event rates in particle detection environments. With a focus on raw data rates from potentially nine channels, instantaneous data rates, and processing times, it highlights the challenges and required upgrades for efficient operation. The analysis covers the specifications like 16-bit resolution, sample rates, and necessary buffer memory upgrades, aimed at supporting higher throughput and performance in experiments while addressing cooling requirements for RF amplification.

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DAQ Considerations For Increased Rep. Rate

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  1. DAQ Considerations For Increased Rep. Rate J. Leaver 01/12/2009

  2. Target DAQ Considerations • Raw data rates: • Potentially 9 channels • Beam Intensity, Target Position, Total Beam Loss, Sector 7 Beam Loss, Sector 8 Beam Loss + 4 Beam Position Signals (2 each for Sector 7 Horiz. & Vert.) • 16 bit resolution (may be able to cope with less…) • 5k samples per event • 100 kHz sample rate (may want more…?)  ~ 88 kB per event • Instantaneous data rate: ~8.6 MB/s • For 10 Hz operation, need to read out ~880 kB per second • Trivial… • May need additional buffer memory on custom DAQ board (Stage 3 upgrade) to cope with instantaneous data rate (but this is independent of rep. rate)

  3. Target DAQ Considerations • Maximum event rate with current Target DAQ: • Time to read out an event: ~50 ms • Time to analyse an event: ~4 ms (New ‘integral’ method) • Time to write an event to disk: ~100 ms (Archiving to .gz files) • GUI overheads: ~100 ms • Time to read an event file: ~180 ms • Time for Event Viewer to display an event: ~280 ms  Maximum event rate: ~4 Hz • Target PCs are surprisingly slow (e.g. MICETrackerSoftware package takes 2-3 times longer to compile than on all other control PCs!) • Would need to reduce write time + GUI overheads to < 50 ms for 10 Hz readout – could be possible with a high spec PC • ‘Headless’ DAQ should achieve 10 Hz on a fast PC

  4. MICE DAQ Considerations • Time to transfer a 1000 muon event: 1 s • RF duty factor: 1/1000  To run at 10 Hz, need: • 100 s spills (i.e. efficiency is reduced) • 100 muons per spill • To run at 10 Hz with 1 ms spills, need to worry about RF amplifier cooling • Cooling power, water plant, etc. → potentially expensive!

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