sPHENIX EMCal discussion

["Sickles, Anne M" <sickles AT illinois.edu>]

Begin forwarded message:

From: "Romero Hernandez, Anabel" <acr4 AT illinois.edu>

Subject: FW: EMCal meeting slides

Date: October 10, 2017 at 2:15:06 PM CDT

To: "Sickles, Anne M" <sickles AT illinois.edu>

________________________________________
From: Romero Hernandez, Anabel
Sent: Tuesday, October 10, 2017 2:14 PM
To: Yongsun Kim
Subject: RE: EMCal meeting slides

________________________________________
From: Yongsun Kim [yongsun.kim AT cern.ch]
Sent: Tuesday, October 10, 2017 9:36 AM
To: Sickles, Anne M
Cc: Romero Hernandez, Anabel; Yongsun Kim
Subject: Re: EMCal meeting slides

Hi Anabel.
Thanks for the hard work and nice slides!

I agree on Anne's comments in general.  And, if you see this kind of big differences (~10%) in fiber counter, please tell me before you make a full sidles so I don't get hear attack. :-)
Usually this merging can be moved out by changing the LowThreshold and HighThreshold.  These are parameters that is working manually at the moment, but to be auto-adjusted later.
Plus, I think the most urgent the x-y map comparing front and back.  As we said yesterday, we can have a meeting prior to the sPHENIX meeting today to elaborate your slides.
Best,
Yongsun


On Oct 10, 2017, at 8:58 AM, Sickles, Anne M <sickles AT illinois.edu<mailto:sickles AT illinois.edu>> wrote:

Hi Anabel,

These are nice slides.  I have a few comments:

—slide 5: on these slides could you make notes to match up the corners between the wide and narrow pictures.
—slide 5: on some of these blocks Eric wants to make them again right, could that be noted (e.g dbn 6, right?)
—slide 6: what is with block 59 the top in the wide end picture in normal light look terrible, is this on the remake list?
—slide 9: I think the %difference between the two ends isn’t the right metric, I think we want to know what is the fraction of fibers that we find compared to the number of screen holes.  Can you note that number instead?

I think that John Haggerty’s comment last week was correct and we want to look at the positions of the found fibers in a 2D histogram so we can know where we are losing fibers.  It doesn’t make sense in general to find a fiber on one side and not on the other.  I think part of the explanation could be what you have on slide 12 (it is possible to make an estimate based on the number of 2x bright fibers and add them back into the total fiber count?).  I think that the 2D plots could also help us understand the low intensity fibers.  If a fiber has low intensity on both sides of the block it is likely due to some defect in the fiber (a crack), but if I fiber has low intensity on only one side I would suspect it is some block of the light at the surface.

I don’t think we can handle all these questions today, but would it be possible to make x-y fiber position plots for a single block comparing the front and the back?

Anne

On Oct 10, 2017, at 12:39 AM, Romero Hernandez, Anabel <acr4 AT illinois.edu<mailto:acr4 AT illinois.edu>> wrote:

Hi,

These are the slides that I'd like to present tomorrow in the sPHENIX EMCal meeting.

I didn't include anything related to the defect finder because I'm unsure about this and I'd like to discuss it with Yongsun first.

Let me know any comments you have.

Regards,
Anabel<emcal_10oct17.pdf>

Anne Sickles
Assistant Professor
University of Illinois at Urbana Champaign
sickles AT illinois.edu<mailto:sickles AT illinois.edu>

Anne Sickles

Assistant Professor

University of Illinois at Urbana Champaign

sickles AT illinois.edu

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