About this version of CSPad alignment

• Quads are aligned individually using their natural coordinates as from the optical measurement (top-left corner is an origin, nearest point to the beam spot).
• Sensors are aligned based on their center position from optical measutement. Center coordinates are calculated as an average of four corners.
• Center coordinates were float numbers with precision of 1 um.
• Additional hand-made offset is applied based on deviation plots (offset in integer number of pixels).
• Tilt angles were taken into account.
• After sensor translation and tilt-rotation coordinates are rounded to integer numbers in order to insert everything in uniform 2-D array.

Earlier versions of CSPad alignment

CSpad Alignment - v2011-05-25
CSPad Alignment - v2011-06-14

Alignment tool

• Takes image of CSPad or quad from 2-D array
• Draw lines along the wire shadows
• Interactively adjust lines along the wire shadows
• Plots:
  • image
  • image profile
  • deviation of the shadow "center of gravity" from line along the line

Alignment parameters

2011-05-25 CSPad alignment parameters

Deviation of the wire shadows from lines

Quad 0

Quad 1

Quad 2

Quad 3