Page History

...

• Number of rows x columns = 185 x 388. (In DAQ notation of rows and columns is interchanged...)
• Most of pixels have size 109.92 x 109.92 um*um.
• Gap between two ASICS is covered by the two rows of elongated pixels with size 109.92 x 274.8 um*um.
• Two versions of sensors have different dimensions between corners, so it is reasonable to define pixel coordinates w.r.t. the sensor center.

...

Optical measurement is maintained by Chris Kenney. Detector or its quad is installed on microscope table and 3-d coordinates of all 2x1 sensor corners are measured with precision about 8um (RMS) in x-y plane. All corners in the measurement are numerated in arbitrary order. This order does not coincide with numeration of 2x1 in DAQ, as shown on plots below. It is expected that numeration order should be the same for different measurements. This procedure depends on CSPAD construction;

• For CSPAD with movable quads (i.e. for CXI) optical measurement is done separately for each quad. The numeration of corners is shown in the plot:
  Image Removed
  The same plots in PDF format: CSPAD quad metrology and CSPAD pixel layout in quads.
  See also: Description of CSPAD layout from DAQ

For each quad measurement is started from the point #1 which in assembled detector is closest to the beam. The 1-st point (x,y,z) coordinates are re-set to (0,0,0) in the beginning of measurements. At the end, it is checked that the 1-st point coordinates are reproduced within precision of measurement.

• For CSPAD with fixed quad geometry (i.e. for XPP) optical measurement is done for entire detector. The numeration of corners in this case is shown in the plot:
  
  The 1-st corner of the 3-rd quad (x,y,z) coordinates are re-set to (0,0,0) in the beginning of measurements. At the end, it is checked that the 1-st point coordinates are reproduced within precision of measurement.

...