Difference between revisions of "Alignment"

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(Created page with " <pre> 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...")
 
 
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==Definitions==
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Alignment describes the corrections to the geometric descriptions of actual detector pieces compared to their nominal as-engineered description.  An example
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is ''rigid body alignment'', which describes the detector piece's position and orientation within some larger frame, ignoring any internal distortions to the
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piece.  Alignment is often built up out of a nested set of corrections, moving outwards to larger frames.
  
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<pre>
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The specifics of the tracker alignment are described on the page [[TrackerAlignment]].
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1) create straw centers along the x axis,
 
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with inner most straw at x=0, direction pointing along +y
 
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1a) apply panel alignment rotation in this basis
 
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as a right-handed rotation about x, then y, then z
 
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from db delta values du, dv, dw
 
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where u=x, v=y, w=z.  using u,v,w empahsizes that
 
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these are not the experiment coordinates for the panel
 
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1b) apply panel alignment postion, in this basis
 
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using db values du dv and dw
 
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2) apply the nominal geometry transformaton to put
 
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  the panel in the plane: push it out the x axis, tweak the z,
 
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  rotate about the z axis.
 
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2a) apply the panel alignment rotion in this basis
 
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from db delta values rx, ry, rz
 
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2b) apply the panel offset in this basis
 
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from db delta values dx, dy, dz
 
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3) apply the nominal transformation to place the
 
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plane in the tracker - shift along z
 
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2a) apply the detector alignment rotion in this basis
 
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from db delta values rx, ry, rz
 
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2b) apply the detector offset in this basis
 
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from db delta values dx, dy, dz
 
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</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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