sPHENIX EMCal discussion

[Craig Woody <woody AT bnl.gov>]

Hi Vera,
  I would reinforce John's comments and avoid giving specific numbers 
about the Moliere radius or radiation length in the abstract. Also, I 
think it  would be worth mentioning the EMCAL resolution and not just 
the jet resolution, which is dominated by the HCAL resolution, since 
that's what your poster is about, and is also relevant to some 
measurements that don't rely that much on the HCAL, such as the upsilon. 
I also don't see where you get a specific number of 5.4 GeV  for 
sigma/E, which would correspond to a specific energy of 4.7 GeV in the 
formula. The expected EMCAL resolution is ~ 12%/SQRT(E), so perhaps you 
could replace the second sentence with something like this:

The proposed design of the electromagnetic calorimeter (EMCAL), made of a 
tungsten powder and epoxy composite with embedded scintillating fibers, is 
designed to have a small Moliere radius and short radiation length, and will 
be located at a radius of about 90 cm from the interaction region. It will 
have an energy resolution ~ $12\%/\sqrt{E}$ and will be used in conjunction 
with a new hadronic calorimeter to provide a jet energy resolution ~ 
$\sigma_{E}/E=120\%/\sqrt{E}$ to resolve single photons and electrons, as 
well as photon jets, in the high multiplicity environment of central heavy 
ion collisions.

I would also not get so specific about the upcoming beam test (nobody 
will care about the actual dates and test beam number), and just say 
that preliminary tests of the calorimeter design have already been 
carried out and that we are planning to test new prototypes of both the 
EMCAL and HCAL in the spring of 2016 in the test beam at Fermilab.

  One last thing, and that is, I would modify to your title to be "A 
Tungsten Powder Epoxy Scintillating Fiber EMCAL for sPHENIX". There are 
many possible types of EMCALs that could use tungsten (more commonly in 
the form of plates) and scintillating fibers, and I think the feature 
that makes this one unique is the matrix of tungsten powder and epoxy. 
Hopefully some these suggestions may make things clearer to the reader.

Cheers,
Craig


On 6/21/2015 5:16 PM, Loggins, Vera wrote:
> Hi John and Eric,
>
> Thank you for your feedback on my abstract.  I have implemented your 
> suggestions and the revised abstract is below:
>
>
> Cheers,
> Vera
>
> Title: Tungsten Scintillating Fiber EMCAL for sPHENIX
>
> Abstract:
>
>       The sPHENIX detector is a proposed new detector at the Relativistic 
> Heavy Ion Collider (RHIC). The sPHENIX physics program focuses on jets and 
> hard probes of the quark gluon plasma (QGP). The proposed design of the 
> electromagnetic calorimeter (EMCAL), made of tungsten powder and 
> scintillating fibers, is designed to have a Moliere radius of 2.3 cm and a 
> detector radius of about 100 cm for a jet energy resolution of 
> $\sigma_{E}/E=120\%/\sqrt{E}=5.4$~GeV to resolve single photons and electrons 
> in the high multiplicity environment, and to identify photon jets. The $\eta$ 
> and $\phi$ segmentation of the EMCAL is 0.024 x 0.024. We have submitted a 
> preliminary request for an extension of T-1044 at FNAL test beam facility 
> (FTFB) to evaluate the next generation of EMCAL and HCAL modules for sPHENIX 
> in the April-July 2016 time frame.  Presumably these modules will be part of 
> that test.
>
>
>
> ________________________________________
> From: John Haggerty [haggerty AT bnl.gov]
> Sent: Saturday, June 20, 2015 8:57 AM
> To: Loggins, Vera
> Cc: sphenix-hcal-l AT lists.bnl.gov
> Subject: Re: [Sphenix-emcal-l] Poster abstract for QM
>
> Vera,
>
> That's a good idea to submit such an abstract and it looks good.
>
> A couple of suggestions:
>
> - I think element names are not capitalized when used in text, so it's
> tungsten powder, not Tungsten powder
>
> - I would omit the 2.3 cm Moliere radius and just waffle something about
> the segmentation being consistent with the shower size.
>
> - Also, you should probably rephrase "resolution high enough" because of
> verbal confusion of "high resolution" with big number over square root
> of E, but if you can't think of better wording, that's ok.
>
> On 6/19/15 5:21 PM, Loggins, Vera wrote:
> > Dear sPHENIX EMCAL members,
> >
> >
> > I would like to submit the following poster abstract for QM2015.
> >
> > I would appreciate it if you would give me some comments and suggestions.
> >
> >
> > [Title]
> >
> > Tungsten Scintillating Fiber EMCAL for sPHENIX
> >
> >
> > [Abstract]
> >
> >
> > The sPHENIX detector is a proposed new detector at the Relativistic
> > Heavy Ion Collider (RHIC). The sPHENIX physics program focuses on jets
> > and hard probes of the quark gluon plasma (QGP). The proposed design of
> > the electromagnetic calorimeter (EMCAL), made of Tungsten powder and
> > scintillating fibers, is designed to have a Moliere radius of 2.3 cm and
> > a radius of about 100 cm for a resolution high enough to resolve single
> > photons and electrons in the high multiplicity environment, and to
> > identify photon jets. The $\eta$ and $\phi$ segmentation of the EMCAL is
> > 0.024 x 0.024. This poster presents the current status of the project
> > design and prototyping.
> >
> >
> >
> > _______________________________________________
> > Sphenix-emcal-l mailing list
> > Sphenix-emcal-l AT lists.bnl.gov
> > https://lists.bnl.gov/mailman/listinfo/sphenix-emcal-l
>
> --
> John Haggerty
> email: haggerty AT bnl.gov
> cell: 631 741 3358
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