I have looked at laser track hits using  StLaserAnalysisMaker (LAna chain option) in "only lasers" run # 11007037.

First I looked at Z distribution of the hits. Looks like the lasers sitting at 155 cm is good.

Plot XY distribution of hits in sector 20 in local coordinates. Radial laser span through both inner and outer padrows.

Select radial laser beam.

Look at the profile of that central laser beam.

Fit outer padrows in the range 140-180 cm.

Fit inner padrows in the range 80-120 cm.

Laser beams look wide. I checked width of the beam profile for inner and outer padrows (80-120 cm for inner padrows, 140-180 cm for outer padrows) and found it to be

~135 mkm for inner padrows and ~614 mkm for outer padrows.

From the above study (laser at 155 cm) angle between inner and outer sections is 0.0034 rad, offset at 120 cm is 0.04 cm.

If one uses laser at 95 cm (see below), then angle between inner and outer sections is 0.0044 rad, offset at 120 cm is 0.11 cm.

If one uses laser at 35 cm (see below), then angle between inner and outer sections is 0.0096 rad, offset at 120 cm is 0.064 cm.

Laser at 95 cm

Laser at 35 cm