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

27/06/2015Imperial College 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)

27/06/2015Imperial College 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

27/06/2015Imperial College 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!