[Halld-tracking-hw] Gas puzzle update

[Beni Zihlmann]

Hi Naomi,

nice results. If you take this data on face value and plot and fit
them (see picture) and then find the x-values for MPV (621)
and drift-time(572) you get very similar results.
MPV -> 57.3% Argon  (quadratic fit no free parameters any more with only 
3 points)
Drift-time -> 57.6% Argon (linear fit)

this of course assuming the iso-propanol does not do anything.

cheers,
Beni



> I now have the cosmics data with the prototype using JLab (production)
> preamp & hvb.  Thankfully there is no significant difference between that
> and the data using CMU (First article/prototype) electronics.
>
> The data set which I showed at the meeting for 55/45 had been analyzed
> using the window times for the JLab data, ie this one set was complete
> garbage.
>
> The progression in MPV amplitude & max drift time with Argon is
>
> 50% Ar  max-amp MPV 204, max drift time 673ns
> 55% Ar  max-amp MPV 425, max drift time 609ns
> 60% Ar  max-amp MPV 932, max drift time 541ns
>
> For the CDC at JLab run 2016 cosmics I found
>
>          max-amp MPV 621, max drift time 572ns
>
>
> The wire used for the CDC is slightly larger diameter than the prototype
> (20um, 18um) and the straw radius is slightly smaller (0.77cm, 0.79cm).
>
> The histograms are here:
> https://halldweb1.jlab.org/wiki/index.php/CDC_prototype_runs_at_CMU
>
>
> Naomi.
>
>
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> Halld-tracking-hw at jlab.org
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