[Halld-tracking-hw] Track length from CDC signal

[Beni Zihlmann]

Hi Naomi,
the signal duration and the signal integral should be similar. I would 
expect
the signal length to be proportional to the track length only while the
signal integral should be proportional to the total energy loss of the 
particle
which is a combination of track length and particle type.
I think I would rather calculate the track length inside a straw from 
the track
parameters and use the signal integral to determine the dE/dx quantity.

I am still worried about the signal not going back to baseline soon 
enough. Was
this problem always present? We introduced signal attenuation on the HV 
board.
Is it possible to check if that does not cause an problem by using an old HV
board that does not have this attenuation?


cheers,
Beni




> This section
>
> https://halldweb1.jlab.org/wiki/index.php/CDC_signal_integration_new#change_in_gradient
>
> is showing the relation between CDC "signal duration" (similar to time
> over threshold) and the track length that was calculated by the
> trackfitting in my analysis code.  In the plots pklength is the signal
> duration and tracklength is the trackfitted path length through the straw.
>    For the larger signals (detector tilted) there is a fairly clear
> relation between the two.
>
> Would it be useful to output the signal duration from the CDC as well as
> the two planned quantities (time and something representing dE)?
>
> Naomi.
>
>
>> I've linked my latest wiki page on attempted dE/dx with the CDC prototype
>> to the agenda.
>> (https://halldweb1.jlab.org/wiki/index.php/CDC_signal_integration_new#Try_to_calculate_dE.2Fdx)
>>
>> This is using measurements with cosmics, with the prototype horizontal and
>> tilted at 30 and 45 degrees to horizontal in order to increase the path
>> length through the straws.
>>
>> Naomi.
>>
>>
>>
>>> Dear Colleagues -
>>>
>>>          We will have our next tracking meeting on Wed. July 18 at
>>> 11:0am.
>>> The agenda has been posted on the Wiki, and the item of note is
>>> calibrations.
>>>
>>>           Starting this meeting, we will no longer have the tracking
>>> software
>>> component of the meeting as it appears that this is being covered
>>> well in both the regular offline meeting and the physics meeting.
>>> (If there are loud and persistent complaints about this decision,
>>> we can reconsider it;-) )
>>>
>>> - Curtis
>>>
>>> --
>>> Prof. Curtis A. Meyer		Department of Physics
>>> Phone:	(412) 268-2745		Carnegie Mellon University
>>> Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
>>> cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/
>>>
>>> _______________________________________________
>>> Halld-tracking-hw mailing list
>>> Halld-tracking-hw at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw
>>>
>>>
>>
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>>
>
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