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Re: Calorimeter Review Talk
Hi Elton
Thanks for your excellent comments Elton. And the start
of this dialog underscores the need to get first versions
out soon so we can start the iteration process.
To address your comments:
1. Need for position information.
That's a good point. It is covered somewhat in slide 13 - insofar as
what happens when you degrade the position information and its
effect on mass resolution. I need to add some words to
point this out. But I also need to carry this out further -
such as the effect on how merging photons affects acceptance.
Will think more.
2. Granularity
This is answered by the plots of Slide 11. I will add words about
the effect of degrading the granularity by a factor of two and
improving by the same factor from nominal. In all this we are
starting from the assumption that the FCAL-like parameters in
E852 and the BCAL-like parameters in KLOE gets physics done
and the issue is how this meets the need for GlueX.
3. BCAL timing
The effect on position is somewhat addressed as above. The
TOF application is addressed in the intro section that I wrote
and I had meant to include a slide but 'ran out of steam'
I will do so.
4. EM rates
I agree - and I will include this in the talk and in the intro
section of the document.
5. Hadronic Backgrounds
I will re-check using Pythia - but my sense is that this is better
covered in the talk (and document section) that Matt and Mihajlo
are working on because a large part of the backgrounds come
about, in the context of a given photon topology (e.g. 4 photons)
from promoting a lower topology to a higher topology because
of algorithmic or physical effects and a demoting of a higher
topology to lower by missing photon for the same reasons.
6. Readout in magnetic field
I think this is better covered in the FCAL and BCAL talks. But I can
certainly summarize these issues you raise in my summary/conclusions
slide as 'and now for upcoming attractions.'
7. Miminimizing material
Again - better covered by M&M - but I can advertise so the
reviewers get ready for really tough questions :-)
8. Gaps in coverage
See slide 12 - the point here is the effect of what happens to the
coverage in the cos[theta_GJ] angular distribution when you start
eating into the LAB angle coverage from 11 to 15 degrees. There are
words in the intro section that go with this. For talks, I don't necessarily
feel that all the words need to be on the slides - I see these as
visual aids to help getting the message across.
Your comments and observations are much appreciated. I will also
re-visit the document to make sure these are covered in detail.
Have fun tomorrow with the FDC review.
BTW - I sent answers earlier today to Daniel and you regarding the
effect of eating into the forward 1 degree coverage in the FDC's
I hope the slides I sent you were of use.
Cheers
Alex
At 7:43 PM -0500 1/31/08, Elton Smith wrote:
>Hi Alex,
>
>Thanks for posting your talk. I took a quick look at it and have the
>following thoughts about issues that are not discussed. We can think about
>how/whether to include them (here in random order):
>
>- need for position information
> - requirements for the granularity of the measurements
>
>- bcal timing, both for position resolution as well as tof
>
>- Background environment
> - EM rates
> - combinatorical background from entire hadronic cross section (you have
> an example of a single reaction)
>
>- Challenges:
> - readout in the magnetic field
> - minimizing material in the active area (and conversions in front of
> the calorimeters)
> - gaps in coverage?
>
>
>Cheers, Elton.
>
>Elton Smith
>Jefferson Lab MS 12H5
>12000 Jefferson Ave
>Suite # 16
>Newport News, VA 23606
>elton@jlab.org
>(757) 269-7625
>(757) 269-6331 fax
>
>On Thu, 31 Jan 2008, Alex Dzierba wrote:
>
>> Dear Friends
>>
>> I have posted a draft version of my talk (Introduction and Overview)
>> for the Calorimeter Review. You can find the link at the bottom
> > of http://dustbunny.physics.indiana.edu/~dzierba/CDR_Calorimeter
>> The talk lacks a conclusion slide and I also want to add a slide on
>> time of flight. I currently have 15 slides.
>>
>> I made the talk available as JPEG's, as a PDF and as a PowerPoint
>> file. I was able to view the PDF with Preview on my Mac but
>> had problems with fonts for the PDF with Acrobat. The PowerPoint
>> seems fine. I used Keynote on my Mac to create the talk.
>>
>> 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
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~