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Re: Talk 2: v3
Hall D PID Mail List:
Hi Curtis and Yves,
Ooohh.....now I get it. The short answer is no, I don't have that
plot readily available. Unfortunately, I just don't think I will have
time to produce it and still get all the mods made to my talk by the
deadline. I can probably get it done in time for a backup slide since
presumably, we can slip those in at the last minute.
Regards,
-David
Curtis A. Meyer wrote:
> Hi David -
>
> I am not sure if it is even possible, but I think what Yves
> wanted to show is what the "dE" plot would look like. E.g.
> don't compute "dx". This is obviously going to look REALLY
> BAD, but it points out the importance of knowing the path
> length through the straws.
>
> cheers -- Curtis
> On Mon March 24 2008, David Lawrence wrote:
>
>> Hi Yves,
>>
>> I guess I'm still confused. Let me describe how those plots were
>> made and then maybe we can figure out what else is needed.
>>
>> The plots were made by letting GEANT track the particles through the
>> full detector w/ full magnetic field map and record the energy deposited
>> in the gas volume for each straw. The sum of energy deposited in the gas
>> by all straws was taken as dE. The tracks were then swum through by the
>> reconstruction code using the known starting parameters. The path
>> through each straw was estimated by a straight line at the calculated
>> point of closest approach that the track made with the wire. The total
>> path length through the gas of each straw used to make dE was added up
>> to make dx. Note that this did not use fit tracks and the fitter does
>> not include energy loss. Both of these would only work to make the
>> estimation of dx worse due to multiple scattering and energy loss.
>>
>> In the end, the culmination of all of these effects should make the
>> dE/dx values shown worse than what is actually expected. Does this clear
>> anything up?
>>
>> Regards,
>> -David
>>
>>
>> Yves Van Haarlem wrote:
>>
>>> Hi David,
>>>
>>>
>>>> I will get you the plots for 1 today, but I'm not sure what is
>>>> meant by
>>>>
>>> Thanks
>>>
>>>
>>>> "no correction for distance" in 2. Are you talking about the 150MeV/c
>>>> cutoff?
>>>>
>>> I believe people meant a dE/dx plot which is not corrected for path
>>> length in the straw.
>>>
>>> Cheers,
>>> Yves
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>> Regards,
>>>> -David
>>>>
>>>> Yves Van Haarlem wrote:
>>>>
>>>>> Hall D PID Mail List:
>>>>>
>>>>> Hi All,
>>>>>
>>>>> While students are playing capture the flag and singing songs in the
>>>>> building I prepared version 3 of talk 2. It can be found on the
>>>>> usual wiki page and is waiting for your comments.
>>>>>
>>>>> Plots that I do not have but were requested during the dry run:
>>>>>
>>>>> 1 - Radiation length plot for a 90 and a 20 degree track (for slide 6)
>>>>> 2 - dE/dx plot with no correction for distance, I was told this plot
>>>>> already exists (for slide 27)
>>>>>
>>>>> David could you provide a link to these plots?
>>>>>
>>>>> Thanks!
>>>>>
>>>>>
>>>>> Cheers,
>>>>> Yves
>>>>>
>>>>>
>>>>> ps. You can also use this link:
>>>>> http://www-meg.phys.cmu.edu/~yvhaarle/cdctalk.pdf
>>>>>
>>>>>
>>>>> /--------------------------------
>>>>> / 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, 19 Mar 2008, Yves Van Haarlem wrote:
>>>>>
>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> The updated version of talk 2 is now available on the wiki page:
>>>>>>
>>>>>> http://www.jlab.org/Hall-D/software/wiki/index.php/DC_and_PID_Review
>>>>>>
>>>>>>
>>>>>> 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
>>>>>> ~~ ~~ \-----------------------------------
>>>>>>
>>>>>>
>>>> --
>>>>
>>>> ------------------------------------------------------------------------
>>>> David Lawrence Ph.D.
>>>> Staff Scientist Office: (757)269-5567 [[[ [ [ [
>>>> Jefferson Lab Pager: (757)584-5567 [ [ [ [ [ [
>>>> http://www.jlab.org/~davidl davidl@jlab.org [[[ [[ [[ [[[
>>>> ------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>>
>
>
>
>
--
------------------------------------------------------------------------
David Lawrence Ph.D.
Staff Scientist Office: (757)269-5567 [[[ [ [ [
Jefferson Lab Pager: (757)584-5567 [ [ [ [ [ [
http://www.jlab.org/~davidl davidl@jlab.org [[[ [[ [[ [[[
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