Update of noise filtering in protoDUNE

Update of noise filtering in protoDUNE Wenqiang Gu Carlos Sarasty

Undershoot correction (successful examples) Before correction After correction RC 1.1ms After correction RC 1.1ms

Zoom-in for the tail (RC 1.1ms – collection plane)

Imperfect pole-zero cancellation Before correction After correction RC 1.1ms After correction RC 0.2ms • Shanshan suspects the imperfect pole-zero cancellation • Is this issue (RC timing) consistent for a specific channel? • Needs a detailed study

Another example After correction RC 1.1ms Doesn’t work • The tail is even shorter • Needs to check the details in pulser data • Maybe a dedicated electronics calibration? • Brian has the most experience in the MicroBooNE

“50 kHz” collection plane noise • An automated filter works now • Needs a large sample for validation --- raw --- filtered

Zoom-in Filtered noise • Filtered noise looks reasonable

Still some fluctuation at the edge • Similar to “Gibbs phenomenon”, ringing at the discontinuity • Can we reduce the fluctuation by adding some suppression at high frequency? Sinc(k/m)  Lanczos factor

By adding sinc(k/m) • A little suppression at high frequency

By adding sinc( 5*k/m) • A lot of suppression here

Comparison Sinc(10*k/m) No suppression at HF Sinc(5*k/m)

Impact on signal • But the suppression factor also reduce the signal, not good --- no suppression --- sinc(k/m) --- sinc(5*k/m) --- sinc(10*k/m)

Sticky code mitigation • Additional sticky code besides of mod64=0,1,63 for some channels, needs a detailed study Mod64 = 7

Update of noise filtering in protoDUNE