[Halld-cal] Draft of BCAL constants document

[Elton Smith]

Hi Andrei, see below.

On 12/12/14 6:33 PM, semenov at jlab.org wrote:
> Elton:
>
> I have a few corrections to the formulas in your document:
>
> Equation 12 on the page 4: In the second term, it should be
> "lambda0*exp(-Z/lambda2)" (viz., you missed the "minus" sign for the "Z").
Done.
>
> Equation 17 on page 7: In the case of "single-exponent" case, the
> "attenuation-to-center-correction" factor should be "exp(L/(2*lambda))"
> (not just "exp(L/2)" as you have now).
Done.
> In you'd like to use
> "short-long-attenuation" model, the factor should be 1/f(0), where f(0)
> comes from eq.12
Since you do not do this to determine the constants, we stay with the 
expression above.
>
> The g-prime coefficient (on page 7) came from the fitting of the cosmics
> ADC spectra to the function I used to describe Irina's simulation results;
> if you want some simplification, it will be not a big mistake to say that
> it equals to the
> simulated-muon-peak-in-att-MeV/measured-muon-peak-in-fADC-integral. (In
> reality, I'm trying to fit not just the peak positions together but to
> find the best match for whole shapes of simulated-and-scaled and measured
> spectra.)
Thanks. Elton.
>
> Hope, it helps,
> Andrei
>
>
>
>
>> Hi all,
>>
>> Local JLab: I have booked L207 for both the BCAL reconstruction (11:15)
>> meeting and the BCAL calibration constants meeting (2 pm),
>>
>> I have updated the version of the document on DocDB, mainly correcting
>> typos and adding clarifying information and indeed continue to update it
>> as I get feedback. If you have any corrections/feedback that do not
>> require discussion send them to me and I can update the document
>> offline. Before the meeting you may wish to check out the latest version
>> for discussion.
>>
>> Andrei: In order to use your calibration constants correctly, we need to
>> know what attenuation length you used to determine the "attenuated
>> energy". Could you please send the value.
>>
>> Thanks, Elton.
>>
>>
>>
>> Elton Smith
>> Jefferson Lab MS 12H3
>> 12000 Jefferson Ave STE 4
>> Newport News, VA 23606
>> (757) 269-7625
>> (757) 269-6331 fax
>>
>> On 12/11/14 3:48 PM, Elton Smith wrote:
>>> Hi Zisis,
>>>
>>> Ok. I suggest we meet tomorrow afternoon at 2 pm and review the
>>> calibration document.
>>>
>>> Thanks, Elton.
>>> Elton Smith
>>> Jefferson Lab MS 12H3
>>> 12000 Jefferson Ave STE 4
>>> Newport News, VA 23606
>>> (757) 269-7625
>>> (757) 269-6331 fax
>>> On 12/11/14 12:41 PM, Zisis Papandreou wrote:
>>>> Hi Elton:
>>>>
>>>> I am available on Friday only between 2-4pm EST.    Monday is wide
>>>> open though.
>>>>
>>>> Cheers, Zisis...
>>>>
>>>> On Dec 10, 2014, at 1:39 PM, Elton Smith <elton at jlab.org
>>>> <mailto:elton at jlab.org>> wrote:
>>>>
>>>>> Dear colleagues,
>>>>>
>>>>> I have uploaded a draft document (GlueX-doc-2618) with definitions for
>>>>> the low-level calibration constants for the BCAL. This is a document
>>>>> for
>>>>> discussion and feedback is welcome. The goal, after we have hashed it
>>>>> out, is to have precise definitions of all constants that are placed
>>>>> in
>>>>> the calibrations data base. In particular, it is necessary to choose
>>>>> some conventions, which need to be clear to avoid errors in
>>>>> reconstruction. We need to agree on what those conventions are. We
>>>>> should also make sure that there are no factors of 2 missing.
>>>>>
>>>>> The document proposes that the gains be specified at the center of the
>>>>> module.  If I understand correctly, this is different than Andrei's
>>>>> convention that uses the end of the module.
>>>>> Therefore, there is a factor of e^{-L/2*lambda} between the two that
>>>>> needs to be sorted out. There may also be other definitions or
>>>>> conventions that need consensus.
>>>>>
>>>>> We should probably find a dedicated time to go over this. As we are in
>>>>> the process of entering constants into db now, I would hope to have a
>>>>> discussion soon. Is Friday a possibility?
>>>>>
>>>>> Thanks, Elton.
>>>>>
>>>>>
>>>>> --
>>>>> Elton Smith
>>>>> Jefferson Lab MS 12H3
>>>>> 12000 Jefferson Ave STE 4
>>>>> Newport News, VA 23606
>>>>> (757) 269-7625
>>>>> (757) 269-6331 fax
>>>>>
>>>>> _______________________________________________
>>>>> Halld-cal mailing list
>>>>> Halld-cal at jlab.org <mailto:Halld-cal at jlab.org>
>>>>> https://mailman.jlab.org/mailman/listinfo/halld-cal
>>>>
>>>> Dr. Zisis Papandreou
>>>> Professor of Physics, Ph.D., P.Phys.
>>>> ---------------------------------------------------------
>>>> Department of Physics
>>>> University of Regina
>>>> 3737 Wascana Parkway
>>>> Regina, SK S4S 0A2 CANADA
>>>>
>>>> *Phone: (306) 585-5379*
>>>> Fax: (306) 585-5659
>>>> Email: zisis at uregina.ca <mailto:zisis at uregina.ca>
>>>> Website:
>>>> http://www.uregina.ca/science/physics/faculty-staff/faculty/zisis-papandreou.html
>>>> <http://kronos.phys.uregina.ca/%7Ezisis/professional/>
>>>>
>>>>
>>>>
>>>>
>>>>
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