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wirecell-gen

The wirecell-gen CLI provides commands related to WCT sim (the gen/ subpackage). See main and command help.

wirecell-gen -h

Depo examples

Histogram predrift (-g1) absolute X positions.

wirecell-gen plot-depos -p x -g1 drifted-depos.npz predrift-x.pdf

Histogram postdrift (-g0) relative X positions assigned from time and speed.

wirecell-gen plot-depos -p x -g0 --t0 "0*ns" --speed '-1.56*mm/us' drifted-depos.npz postdrift-ts.pdf

Again but with an ad-hoc correction to t0 to make aligned with predrift-X

wirecell-gen plot-depos -p x -g0 --t0 "-3487.8875*mm / (1.56*mm/us)" --speed '-1.56*mm/us' drifted-depos.npz postdrift-tsa.pdf

The assigned postdrift-X is $x = (t+t_0)/s$ where $t$ is drifted depo time, $t_0$ is an arbitrary time offset and $s$ is a drift speed.

The predrift-X is given in an absolute coordinates system while postdrift-X assignment gives a relative position. The ad-hoc correction accounts for the absolute location of the response plane and the direction of the drift.

The exceedingly exact number -3487.8875*mm came from peaking into the configuration for the detector being simulated:

wcsonnet layers/mids/pdsp/variants/nominal.jsonnet|jq '.geometry.drifts[].faces[].response'|sort -u
-3487.8875
3487.8875
-3773.6125
3773.6125

Without looking into which PDSP APA face the depos collected, each response plane location was tried and the resulting postdrift-X distribution compared to predrift-X.

The drifted depos also have absolute time:

wirecell-gen plot-depos -p t -g0 drifted-depos.npz postdrift-time.pdf