[Halld-tracking-hw] Gas puzzle update

[Fernando J Barbosa]

Hi Naomi,

Indeed very nice! I think you are using 1-propanol, though.

Best regards,
Fernando


On 1/26/2015 2:29 PM, Beni Zihlmann wrote:
> 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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>
>
>
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