Page History
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where pedestals and <gain-factor> are per-pixel map combined from 7 gain mode maps.
Calibration
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procedure
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Switching gain mode | AHL-H | AHL-L | AML-M | AML-L |
---|---|---|---|---|
pedestal H(M)-from dark, L-evaluated | 3332 | 1825 | 3295 | 2601 |
offset (B) from fit | 4584 | 3077 | 3679 | 2985 |
offset (B) difference H(M)-L | 1507 | 694 | ||
gain (G) from fit | 47 | 0.52 | 15.4 | 0.49 |
Denote
- p - pedestal
- B - fit base-level offset parameter, <intensityADU> = B + G * <event-index-from-0-pulser>
- G - gain
Current (plots above and results in table) naive version of L-pedestals evaluation
- pL = pH - (BH-BL)
Gabriel's version
- pL = BL - (BH-pH)*GL/GH
L-pedestals using Gabriel's formulae for AHL-L and AML-L
pedestals_L = pedestals_H(M) - <offset-difference-H(M)-L>
Questions
- do we need to account for the difference between offset (B) and pedestal (Gabriel's version)
- the same difference may be between fit B(L) and pedestal(L) or OR it is smaller due to the gain?
- is current procedure correct?
- if not
- what is correct procedure?
- or what could we calibrate with charge injection?
2020-06-22 ASIC issue
detdaq18 run 52
Panel 14 (counting from 0) /reg/g/psdm/detector/gains/epix10k/panels/0000000001-0175696641-1056964630-1010951301-0019435010-0000000000-0000000000
Data for a few charge injection points
Injected charge or gain is too small to switch to L-gain mode...
Gains AHL-H, AHL-L, AML-M, AML-L
Panel 14(next-to-last) charge injection in ASIC1 does not work
2020-06-24 calibration constants for ALL gain ranges and panels
detdaq18 run 52
pL were evaluated using Gabriel's formulae.
plots for pedestals, pixel_rms, pixel_status, pixel_gain (default), gain from charge injection
deployed as
/reg/d/psdm/det/detdaq18/calib/Epix10ka2M::CalibV1/DetLab.0:Epix10ka2M.0/*/52-end.data
SHAPE (7,16,352,384) : 7-gains, 16-panels of shape (352,384)
References
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