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The procedure for CAL gain intercalibration at PS and SPS is based on the CalTuple.
we've been looking at the calibration runs 700001789-700001863 using the cal
tuples, to check At SPS we checked the constants obtained at PS (towers 2 and 3), especially for
HEX8 for which the lever arm in energy deposit was not so large (for the moment
let's forget about . We alsocalibrated tower 1 for which LEX1/HEX8 was not calibrated at PS)P.
To intercalibrate gains of each given log end, we sum almost (see below) all
runs available and fit the profile histogram of s_i (signal for gain #i) vs
s_i+1 (signal for gain #i+1) to get the slope. This profile is limited to the
events where 1/ s_i does not saturate 2/ s_i+1 < saturation value of s_i and 3/
the ratio s_i/s_i+1 is close to 1 within 30% (or close to. In addition, for the logs at the
center of a module, we don't keep the runs corresponding to scan positions near
their end to avoid direct illumination of the diodes due to beam and shower
spread (in that case the scatter plots are a mess...). Despite these criteria,
some weird features were observed.
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