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Re: Calorimeter Review and Monitoring/Calibration
Dear Elke,
On the stability question:
If we use the laser, we will use a reference photodiode in parallel(I
didn't mention this because I thought it was getting detailed).
On the LED's `is more tricky:these devices are supposed to be stable but
from first tests it is not obvious.The temperature dependence is a
disadvantage as well and we propose to study on detail.
On the placement of the sysstem:I deliberately didn't mention much (except
the size) because it is still open .WE don't even know the readout of the
BCAL outer layers!In the FCAL one could in addition should use a
radioactive source etc etc
Cheers,Christine
> On Thu, 14 Feb 2008, Elke-Caroline Aschenauer wrote:
>
> Dear Christina,
>
> I looked through the slides in a bit more detail.
> One question coming always up with all this calibration and gain
> monitoring systems.
> How stable are they. Do you have already some idea on the stability of the
> systems, like drifts per day or ....
> Even if you measure "only" relative gain drifts, some reference
> detectors are needed, did you already select some technology. In HERMES
> we actually used 2 different types, just as a small reference
>
> A gain monitoring system with Nd:YAG Laser for the Photomultipliers of
> the HERMES experiment
> H.Tanaka et al
> Nucl. Instrum. and Meth. A 515 (2003) 725
>
> The other question which might come up, where do we want to couple the
> light in, in the photomultipliers / sipmts or in the scifi / lead-glass or
> in both. I know for the BCal we talked about coupling the light into the
> winston cones.
> I was just thinking one or 2 slides if at all possible on how the system
> might be integrated into the detector layouts might be nice. But if there
> is no clear concept yet also fine, it is work in progress, so we have not
> to be 100% complete.
>
> cheers elke
>
>
>
>> Date: Thu, 14 Feb 2008 14:18:43 -0500 (EST)
>> From: Elke-Caroline Aschenauer <elke@jlab.org>
>> To: Christina Kourkoumeli <hkourkou@phys.uoa.gr>
>> Cc: Alex Dzierba <dzierba@indiana.edu>, halld-cal@jlab.org
>> Subject: Re: Calorimeter Review and Monitoring/Calibration
>>
>> On Thu, 14 Feb 2008, Christina Kourkoumeli wrote:
>>
>> Dear Christine,
>>
>> I just wanted to answer quickly, first of all thank you very very much
>> for
>> the slides. I will go through them in a bit more detail tonight and send
>> you remarks if I have any.
>>
>> George, please don't include them in your talk, the slides are thought
>> as
>> backup if we get questions. Such we are consitent with the FCal talk.
>>
>> One small remarks we will not print backup slides, apart from we get an
>> explicit request to do so.
>>
>> Cheers and thanks to everyboody
>> elke
>>
>>
>> > Date: Thu, 14 Feb 2008 15:39:11 +0200 (EET)
>> > From: Christina Kourkoumeli <hkourkou@phys.uoa.gr>
>> > To: Elke-Caroline Aschenauer <elke@jlab.org>
>> > Cc: Alex Dzierba <dzierba@indiana.edu>, halld-cal@jlab.org
>> > Subject: Re: Calorimeter Review and Monitoring/Calibration
>> >
>> > Dear all,
>> > please find attached a few slides about the calibration+monitoring
>> system.
>> > Good luck with the review,
>> > Christine
>> > > On Wed, 13 Feb 2008, Alex Dzierba wrote:
>> > >
>> > > Dear Alex,
>> > >
>> > > I know and I have asked Christina to generate slides on the
>> calibration
>> > > system we are currently studying, so we can use them if the question
>> > > comes up. Beni will prepare a slide as backup addressing showing the
>> > > calibration system of radphi and E852, this show we have even 2
>> solutions
>> > > for the FCal if the common system for FCal, Bcal and Tof would not
>> work.
>> > >
>> > > cheers elke
>> > >
>> > >
>> > >
>> > >> Date: Wed, 13 Feb 2008 08:32:59 -0500
>> > >> From: Alex Dzierba <dzierba@indiana.edu>
>> > >> To: halld-cal@jlab.org
>> > >> Subject: Calorimeter Review and Monitoring/Calibration
>> > >>
>> > >> Hi All
>> > >>
>> > >> I just realized that neither the Calorimeter CDR document nor
>> > >> the BCAL/FCAL talks address the issue of monitoring and
>> calibration.
>> > >> This is a natural question for the reviewers to ask and we should
>> > >> address it.
>> > >>
>> > >> 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 +
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>> -
>> > > +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>> > >
>> > >
>> >
>>
>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>> ) `\ -
>> / '. | +
>> | `, 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 -
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>
>