Re: Additional data

["Fernando J. Barbosa" <barbosa@jlab.org>]

Hi Yves,

OK. Let me take a look at your plots.

Regards,
Fernando



Yves Van Haarlem wrote:
> Hi Fernando,
>
> I forgot to mention one more thing:
>
> The "energy" spectra plotted under "Energy spectra" on the wiki:
>
> I integrate over the signal starting when it is above pedestal and 
> stopping when the signal becomes smaller than < pedmean+5*sigma.
> If you want I can change that definition.
>
>
> Cheers,
>     Yves
>
>
>                           /--------------------------------
>                          /   Yves Van Haarlem
>        _--~~--_         /
>      /~/_|  |_\~\      /      Carnegie Mellon University
>     |____________|    /        Department of Physics
>     |[][][][][][]|:= /          Wean Hall room 8404
>   __| __         |__ \            Pittsburgh, PA 15213
>  |  ||. |   ==   |  | \           USA
> (|  ||__|   ==   |  |) \
>  |  |[] []  ==   |  |   \           Tel.:   +1 412 268-6949
>  |  |____________|  |    \                  +1 412 641-9252
>  /__\            /__\     \          Fax.: +1 412 681-0648
>   ~~              ~~       \-----------------------------------
>
> On Wed, 18 Jun 2008, Fernando J. Barbosa wrote:
>
>> Hi Gerard,
>>
>> I think Yves is plotting peak amplitudes from the ADC sampled data 
>> because they are what will determine the dynamic range for the ASIC 
>> for different particles, track lengths, etc. Of course the amplitude 
>> is proportional to the charge (~ 15% with 11 ns peaking time) from 
>> the event in the detector.
>>
>> Trying to understand the amplitude spectrum in the context of energy 
>> resolution, and not the dynamic range for the ASIC, is what I was 
>> asking Yves. In this regard, we would need the plots to show the sum 
>> of all the samples within the drift time "gate"(~300 ns ?). How is 
>> the trigger formed, coincidence of straws? Certainly Yves will be 
>> able to tell us more details.
>>
>> When I first looked at the plots, it seemed to me that the escape 
>> peak for Ar was visible, in addition to the 5.9 KeV Fe55 peak. With 
>> more recent data, I am not sure that is really there.
>>
>> Regards,
>> Fernando
>>
>>
>>
>>
>> Gerard Visser wrote:
>>> Hi -->
>>>
>>>     Gerard
>>>
>>> Fernando J. Barbosa wrote:
>>>> Hi Yves,
>>>>
>>>> I would like to take a look at some of your raw ADC data in time 
>>>> for the
>>>> triggered events. Also, it would be nice if you could provide a 
>>>> diagram
>>>> of the triggering electronics/detectors and setup. I am particularly
>>>> interested in the data from the three plots under "what about another
>>>> straw ..." and the three following plots under "Different-HV".
>>>>
>>>> With regards to the energy measurements, I would like to look at plots
>>>> of the sum of the ADC samples over the drift time of the straw for the
>>>> same plots I mentioned above for triggered events.
>>>
>>> Not that I understand the apparent spectrum here (can you explain 
>>> it?), but I certainly _thought_ that is exactly what Yves is 
>>> plotting. Isn't it? "Amplitude" = integral of the pulse ~= integral 
>>> over a fixed time bracketing the pulse. Pedestal subtracted of course.
>>>
>>> Or are you plotting peak height here, Yves? That would probably 
>>> allow for the strange shape of this curve. (??)
>>>
>>>>
>>>> Thanks,
>>>> Fernando
>>
begin:vcard
fn:Fernando J. Barbosa
n:Barbosa;Fernando J.
org:Jefferson Lab
adr:Suite #10, 12B3;;12000 Jefferson Ave.;Newport News;VA;23606;USA
tel;work:757-269-7433
version:2.1
end:vcard