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Re: fiber emission spectra web page updated
Hi Elke
Sorry for not responding earlier yesterday. I "took the day off"
trying out new diving camera gear in a swimming pool.
George's answer to your original question is indeed correct and the
text at the top of the web page
http://dustbunny.physics.indiana.edu/~dzierba/moyal_fits and next
to top figure describes the methodology of fitting the raw spectra
and integrating over wavelength to yield the data points in the top
figure and the very bottom figure. The data points in the top
figure designated as "2-m 2008 data" are identical to the data
points in the very bottom figure labelled as "fast green." In
both cases I did a fit to a double exponential. The short and long
attenuation lengths quoted are more or less in line with each other
but the top figure includes a more careful error analysis - which was
why I posted the update. For completeness, the two other data
sets in the top figure are measurements and fits to BCF20
(also called 'fast green') integrated spectra as well. But these are
4-m long fibers and measurements made in 2007 and 2008 are compared.
The point here was to quantify the reproducibility of Blakes'
methodology.
Bottom line is that the 2-m BCF-20 fibers definitely have a
degraded attenuation behavior compared to the BCF-20 4-m
fibers.
Cheers
Alex
At 8:20 PM -0500 3/2/08, Elke-Caroline Aschenauer wrote:
>On Sun, 2 Mar 2008, George Lolos wrote:
>
>Hi,
>
>that is what I thought as well but the result for the BCF-20 is different
>than in the first plot on the page.
>
>bye elke
>
>
>> Date: Sun, 02 Mar 2008 18:50:31 -0600
>> From: George Lolos <George.Lolos@uregina.ca>
>> To: dzierba@indiana.edu, elke@jlab.org
>> Cc: halld-cal@jlab.org
>> Subject: Re: fiber emission spectra web page updated
>>
>> Hi Elke:
>>
>> The attenuation lengths in the figure you refer to are the integrated
>> (bulk) results over the respective emission spectra of the three fibers.
>>
>> Cheers,
>>
>> George
>>
>> >>> Elke-Caroline Aschenauer <elke@jlab.org> 03/02/08 6:39 PM >>>
>> On Sat, 1 Mar 2008, Alex Dzierba wrote:
>>
>> Dear Alex and Blake,
>>
>> very interesting results. I have just 2 very small questions.
>> Blake I huess you will or have already measured the attenuation length
>> for
>> the BCF-12cand BCF-60.
>>
>> the last plot on the www-page after the Moyal fits is the attenuation
>> length for which wave lenght?
>>
>> thanks elke
>>
>>
>>
>> > Date: Sat, 1 Mar 2008 08:33:54 -0500
>> > From: Alex Dzierba <dzierba@indiana.edu>
>> > To: halld-cal@jlab.org
>> > Subject: fiber emission spectra web page updated
>> >
>> > Dear Friends
>> >
>> > The page:
>> > http://dustbunny.physics.indiana.edu/~dzierba/moyal_fits
>> > showing results of analysis of recent fiber emission spectra
>> > measurements has been updated and the photos (taken by
>> > Blake) of the setup now have captions.
>> >
>> > Cheers
>> > Alex
>> >
>> > --
>> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> > Alex R. Dzierba
>> > Chancellor's Professor of Physics (Emeritus)
>> > Department of Physics / Indiana U / Bloomington IN 47405 /
>> 812-855-9421
>> > JLab Visiting Fellow
>> > Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 /
>> 757-269-7577
>> > Home Phone: 812-825-4063 Cell: 812-327-1881 Fax: 866-541-1263
>> > http://www.dzre.com/alex
>> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> >
>>
>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>> ) `\ -
>> / '. | +
>> | `, Elke-Caroline Aschenauer =
>> \,_ `-/ -
>> ,&&&&&V Jefferson Lab +
>> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
>> ,&&&&&&&&&&; Suite 8 Hampton, VA 23664 -
>> | |&&&&&&&;\ 12000 Jefferson Ave +
>> | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> > | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
>> '--' `-.--. | +
>> \_ | |---' Tel.: 001-757-269-5352 =
>> `-._\__/ Fax.: 001-757-269-6331 -
>>
>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>>
>>
>>
>
> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> ) `\ -
> / '. | +
> | `, Elke-Caroline Aschenauer =
> \,_ `-/ -
> ,&&&&&V Jefferson Lab +
> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
>,&&&&&&&&&&; Suite 8 Hampton, VA 23664 -
>| |&&&&&&&;\ 12000 Jefferson Ave +
>| | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
>| | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
>'--' `-.--. | +
> \_ | |---' Tel.: 001-757-269-5352 =
> `-._\__/ Fax.: 001-757-269-6331 -
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alex R. Dzierba
Chancellor's Professor of Physics (Emeritus)
Department of Physics / Indiana U / Bloomington IN 47405 / 812-855-9421
JLab Visiting Fellow
Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 / 757-269-7577
Home Phone: 812-825-4063 Cell: 812-327-1881 Fax: 866-541-1263
http://www.dzre.com/alex
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~