Alignment: Difference between revisions

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==Definitions==
Alignment describes the corrections to the geometric descriptions of actual detector pieces compared to their nominal as-engineered description.  An example
is ''rigid body alignment'', which describes the detector piece's position and orientation within some larger frame, ignoring any internal distortions to the
piece.  Alignment is often built up out of a nested set of corrections, moving outwards to larger frames.


<pre>
The specifics of the tracker alignment are described on the page [[TrackerAlignment]].
1) create straw centers along the x axis,
with inner most straw at x=0, direction pointing along +y
1a) apply panel alignment rotation in this basis
as a right-handed rotation about x, then y, then z
from db delta values du, dv, dw
where u=x, v=y, w=z.  using u,v,w empahsizes that
these are not the experiment coordinates for the panel
1b) apply panel alignment postion, in this basis
using db values du dv and dw
2) apply the nominal geometry transformaton to put
  the panel in the plane: push it out the x axis, tweak the z,
  rotate about the z axis.
2a) apply the plane alignment rotion in this basis
from db delta values rx, ry, rz
2b) apply the plane offset in this basis
from db delta values dx, dy, dz
3) apply the nominal transformation to place the
plane in the tracker - shift along z
2a) apply the detector alignment rotion in this basis
from db delta values rx, ry, rz
2b) apply the detector offset in this basis
from db delta values dx, dy, dz
</pre>


[[Category:Computing]]
[[Category:Computing]]
[[Category:Code]]
[[Category:Code]]
[[Category:Database]]
[[Category:Database]]

Latest revision as of 22:38, 13 January 2021

Definitions

Alignment describes the corrections to the geometric descriptions of actual detector pieces compared to their nominal as-engineered description. An example is rigid body alignment, which describes the detector piece's position and orientation within some larger frame, ignoring any internal distortions to the piece. Alignment is often built up out of a nested set of corrections, moving outwards to larger frames.

The specifics of the tracker alignment are described on the page TrackerAlignment.

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