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Accumulation of spectra for image
The Mini-CSPad image arrays (185, 388, 2) of the cxi49812 runs from 200 to 214 were processed as flattened arrays of amplitude vs pixel and stored in the 2d array: spectra (143560, 120), where
- 143560 = 185*388*2 is a total number of pixels,
- 120 is a number of bins in the image amplitude range from -20 to 100 ADC units.
Description of plots
For each run we present the set of plots:
- Spectra: 120 amplitude bins * 143560 pixels (185*388*2 = 143560), amplitude range: [-20, 100] ADC units
- Spectrum of all pixels
- Spectrum of pixel 100000
- Spectrum of pixel 10000
Plots
cxi49812-r0200, 42962 events
cxi49812-r0201, 15990 events
cxi49812-r0202, 40336 events
cxi49812-r0203, 10197 events
cxi49812-r0204, 66368 events
cxi49812-r0205, 32111 events
cxi49812-r0206, 73412 events
cxi49812-r0207, 29735 events
cxi49812-r0208, 35901 events
cxi49812-r0209, 27595 events
cxi49812-r0210, 34038 events
cxi49812-r0211, 15550 events
cxi49812-r0212, 47923 events
cxi49812-r0213, 22799 events
cxi49812-r0214, 25638 events
Sum of spectra for runs 202-207
To find the gain correction factors we sum together spectra of all runs with back-scattered photons
without fluorescense.
Additional plots
- For each pixel spectrum the mean 0- and 1-photon amplitude is estimated as a weighted average over spectrum for amplitudes <20 and ? 20, respectively.
- The gain is calculated as a difference between 1- and 0- photon mean amplitudes.
- The gain correction factor is calculated for pixels with gain > 0 as
gain_correction_factor(pixel) = Amplitude_mean / Amplitude(pixel)
- The pixel-by-pixel product of the mean 1-photon amplitude and the gain correction factor is also shown for corss-check.
Array for gain correction
- Numpy float32 array of the gain correction factors are saved in the file
~dubrovin/LCLS/PyApps/GainCalibration/cxi49812-r0203-r0207-gain-correction-factors.np
- Should be shaped as (185*388*2 = 143560)
Gain corrected 1-gamma images and spectra for runs 210, 211, and 212
Event-by-event gain corrected 1-gamma images and spectra for runs 210, 211, and 212
Image amplitudes are selected after gain correction with 20 ADC units threshold for 1-gamma.
Overview
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