sPHENIX is a new detector at RHIC.

[John Lajoie <lajoie AT iastate.edu>]

Hi Edward,

    Two comments:

The latter includes a compact tungsten/scintillating fiber electromagnetic
calorimeter and two steel/scintillating tile hadronic calorimeters (sections).,The outer one also
serves as a field return yoke to the central magnet.

The baseline for sPHENIX currently includes only one outer hadronic calorimeter segment. How about:

The latter includes a compact tungsten/scintillating fiber electromagnetic
calorimeter and a steel/scintillating tile hadronic calorimeters. The outer calorimeter steel also
serves as a magnetic flux return for the central magnet.

Next:

Constrained by the preexisting BaBar superconducting magnet, we have
chosen for sPHENIX a relatively thin (~5Labs) hadronic calorimeter segmented longitudinally
into two parts with towers in each longitudinal section overlapping in azimuth and rapidity. With
the hadronic calorimeter split into Inner (inside the magnet) and Outer (outside the magnet)
sections, we improved electron identification in the experiment and reduced the overall cost of
the experiment.

This is group of sentences is somewhat inaccurate. The depth of the calorimetry is set more by the size of the existing shield wall and interaction hall and not by the BaBar solenoid. Besides, why would you talk down sPHENIX by making it sound like a compromise?  It also again references two longitudinal segments, and the hadronic interaction length we quote includes the EMCal.  The inner HCAL has been shown time and time again to have almost no contribution to electron ID in AuAu. 

How about:

Built around the preexisting BaBar superconducting magnet, we have
chosen for sPHENIX a calorimetry system segmented with towers in each longitudinal
section overlapping in azimuth and rapidity.

Regards,
John

On 3/30/2018 9:58 AM, Edouard Kistenev wrote:

I am asked to present the current status of sPHENIX calorimeters in CALOR2018 conference (Eugene, Oregon, May 2018). The abstract (attached) submission dead end is this coming Monday.  Comments and suggestions appreciated.
                        Edward

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John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

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