Test How To

Set test environment

ssh -Y pslogin

ssh -Y psana

source /cds/sw/ds/ana/conda1/manage/bin/psconda.sh

Get files for alignment

Copy current version of the geometry file 1-end.data:

cp /cds/data/psdm//mec/meclx6420/calib/Epix10kaQuad\:\:CalibV1/MecTargetChamber.0\:Epix10kaQuad.3/geometry/1-end.data .

Process xtc data and generate averaged and max-intensity data arrays including det-calib-max.npy:

det_calib_ave_and_max exp=meclx6420:run=387 MecTargetChamber.0:Epix10kaQuad.3

Command to plot image and r-phi projection

geometry_image -h

geometry_image -a det-calib-max.npy -g 1-end.data -H 8

geometry_image -a det-calib-max.npy -g 1-end.data -H 8 -Z -110000

By default it uses psana coordinale frame. See for detail parameter --cframe CFRAME

Tilt of the detector

No tilt

geometry for non-tilted quad 3
# HDR PARENT IND     OBJECT IND    X0[um]   Y0[um]   Z0[um]   ROT-Z  ROT-Y  ROT-X     TILT-Z    TILT-Y    TILT-X

      CAMERA  0  EPIX10KA:V2  0     20791   -20806        3       0      0      0    0.23214   0.25731   0.20971
      CAMERA  0  EPIX10KA:V2  1    -20692   -20880       -3       0      0      0    0.04054  -0.13699  -0.00753
      CAMERA  0  EPIX10KA:V2  2     20697    20601       -3       0      0      0    0.25870   0.04055   0.01810
      CAMERA  0  EPIX10KA:V2  3    -20796    21086        2       0      0      0    0.14601  -0.35560   0.02638
          IP  0       CAMERA  0    -87000    13700  -112000       0      0      0   -1.80000   0.00000   0.00000
  • Detector center is set to get image of concentric internal rings.
  • External rings are strongly non-concentric with internal
  • Sorry, but histogram on r-phi plot is not zoomed-in, so its radial scale is different from the plot.

Tilted detector

geometry for tilted ~25 degree quad 3
# HDR PARENT IND     OBJECT IND    X0[um]   Y0[um]   Z0[um]   ROT-Z  ROT-Y  ROT-X     TILT-Z    TILT-Y    TILT-X

      CAMERA  0  EPIX10KA:V2  0     20791   -20806        3       0      0      0    0.23214   0.25731   0.20971
      CAMERA  0  EPIX10KA:V2  1    -20692   -20880       -3       0      0      0    0.04054  -0.13699  -0.00753
      CAMERA  0  EPIX10KA:V2  2     20697    20601       -3       0      0      0    0.25870   0.04055   0.01810
      CAMERA  0  EPIX10KA:V2  3    -20796    21086        2       0      0      0    0.14601  -0.35560   0.02638
          IP  0       CAMERA  0    -84000    14400  -112000       0   25.5      0   -1.80000   0.00000   0.00000
  • Detector center and tilt are manually tuned to make all rings almost concentric.
  • This is a proof of principle that it works.
  • Better tuning should be done if necessary.

Visualization issue

Switch to run 385 for smooth rings

Real problem

On 2022-10-11 Khachiwan Buakor shared slides pointing to the real issue as shown on figure

Explanation

Let us zoom in image for panel 0 and present it in two cases:

  1. original geometry from file 1-end data - shown image reproduces effect reported by Khachiwan.
  2. panel 0 in the geometry file is shifted by +50um (half pixel size) both in x and y - observed kinks in rings went to different position (in other ASIC).


This demo shows that reported effect is relevant to visualization - for 2-d plot float pixel coordinates need to be converted to bin indexes. At some places pixel index is incremented by 1 due to rounding of float to int. 

References

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