[Halld-offline] event-number-dependent calibration

[Beni Zihlmann]

Hi All,
I think the main questions are how long does a run take in time and what 
is the time period
in which one expects some parameter of a readout channel to change and 
can be detected.
I any case I would expect a database to have a row entry for each 
readout channel with
the calibration values and the start and end times of the validity of 
this calibration data.
The analysis code has to figure out what  time period the events are in 
and what calibration
parameters for a given channel and time are applicable.

my half a cent of input
Beni


> David,
>
> I had a thought: I remember in G7 they had some kind of problem with the 
> tagger(?) where they had to apply a different correction for different 
> sections of a single run. This had to be done with some ad-hoc system of 
> course. We might think about this since we are starting from scratch: is 
> there some way to apply calibrations constants that vary within a run. I 
> think you would want to have this as a non-default feature, something 
> that only exists if needed.
>
> Just wanted to add that to the feature wish list. Something to think 
> about at least.
>
>    -- Mark
>
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