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• center - x, y, z center position of each 2x1 for all quadrants. Comes from optical measurement.
• center_corr - additional manual correction to the center parameter. Can be applied if the optical measurement has (non-)obvious problems.
• marg_gap_shift - margins, gaps, and shifts between quads, as explained below. Comes from image-based tuning.
• offset - x, y, z coordinates for 4 quads. Fairly-reasonable assigned before tuning of the offset_corr and marg_gap_shift parameters.
• offset_corr - additional correction to the offset. Comes from image-based tuning.
• quad_rotation - 4 quad rotation in n*90 degree. Comes from basic geometry.
• quad_tilt - 4 quad tilt in fractional degree. Has never been used. In latest optical measurement is accounted through the global 2x1 coordinate measurement in the detector.
• rotation - 8 2x1-rotation angle for 4 quads in n*90 degree. Comes from basic geometry.
• tilt- 8 2x1-tilt angle for 4 quads in fractional degree. Comes from optical measurement.

CSPAD position parameters w.r.t. IP:

• beam_vector- (description given by TJ Lane) a R^3 vector pointing from the interaction site to the location of beam_intersect (below), along the direction the beam travels. The magnitude of this vector is the distance between the interaction site and the rough plane of the detector.
• beam_intersect- (description given by TJ Lane) a R^3 vector pointing from the origin (of CSPAD?) to the beam_vector, and intersecting the beam in an orthogonal manner. This can intuitively be though of as the "center" of the detector – and will be that center in the case that the detector is completely contained in a plane normal to the beam, and the origin is in
  that plane.

File format for calibration types

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-0.33819   0.00132   0.31452  -0.03487   0.14738   0.07896  -0.21778  -0.10396
-0.27238  -0.00526   0.02545   0.03066  -0.03619   0.02434   0.08027   0.15067
-0.04803  -0.00592   0.11318  -0.07896  -0.36125  -0.31846  -0.16527   0.09200
 0.12436   0.00263   0.44809   0.25794  -0.18029  -0.00117   0.32701   0.32439

beam_vector

Tail of the path: beam_vector/<run-range>.data
Parameters: 3 components of the vector:

bv_x bv_y bv_z

Typical values:

0 0 0

beam_intersect

Tail of the path: beam_intersect/<run-range>.data
Parameters: 3 components of the vector:

bi_x bi_y bi_z

Typical values:

0 0 00.00263   0.44809   0.25794  -0.18029  -0.00117   0.32701   0.32439

Pixel coordinate reconstruction

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