Residuals with the iTPC

I took a look at residuals from 500 events in Run 19 19.6 GeV data, run 20057003, which is one of the lowest luminosity runs in that dataset as shown by the red markers in this plot of log10(bbcx) vs. unixtime:



With this condition, there may be some SpaceCharge, but it should be pretty small, so I've turned off the corrections for SpaceCharge & GridLeak. For this set of plots, the padrow 40 distortion correction is turned on (this corrects for the electrostatic distortion around the GridLeak wall). And as a reminder, the SectorAlignment distortion correction handles the gating grid plane's displacement in z (with respect to the intended position for a uniform primary drift E field of the TPC) as a consequence of misalignments of the sectors.

Here are the along-the-padrow residuals [cm] vs. padrow (binned by groups of 4 rows) of primary tracks for several conditions. The individual 24 sectors are colored blue (sector 1) through red (sector 24).

alignment params SectorAlignment distortion correction off SectorAlignment distortion correction on
supersector: old
inner-to-outer: survey
supersector: old
inner-to-outer: 2020 calib
supersector: 2019 calib
inner-to-outer: survey
supersector: 2020 calib
inner-to-outer: 2020 calib

Notes:
2019 calib: by Yuri, entered in database in 2019
2019 calib: by Irakli, entered in database in 2020

-Gene