[Halld-cal] Draft of BCAL constants document

[Elton Smith]

Hi Andrei, see below

On 12/12/14 6:51 PM, semenov at jlab.org wrote:
> Elton:
>
> 2 more corrections:
>
> In eq.9 on page 3: it should be [f(0)/f(z')]
>
> In eq.10 on page 3: it should be [f(0)/f(-z')]

already corrected in latest version. Thanks, Elton.
>
> Cheers,
> Andrei
>
>
>> 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").
>>
>> 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). In you'd like to use
>> "short-long-attenuation" model, the factor should be 1/f(0), where f(0)
>> comes from eq.12
>>
>> 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.)
>>
>> 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>
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>>>>>
>>>>> 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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