sPHENIX cold QCD topical group

["Aidala, Christine" <caidala AT bnl.gov>]

Minutes:

 

Christine + Nils – Topical group news

---------------------------------------------

Language for the LOI charge to propose to ALD Berndt Mueller was agreed upon by Dave, Gunther, Christine, and Nils on Friday.  Still waiting for approval of the charge language by Berndt. 

 

Propose to structure studies related to the LOI around focus groups:

-Generator-level studies

-EM Calorimeter

-PID for hadrons

-Tracking, jets, displaced vertices

 

Intent is to perform modest-statistics, limited-scope GEANT4 studies to understand detector performance parameters (e.g. energy resolution in different subsystems/directions, momentum resolution, electron ID efficiency, hadron PID efficiency, pi0 cluster separation, etc.), then run high-statistics generator-level studies using performance parameters determined from GEANT.

 

Need to settle beam energies and integrated luminosities soon.  Must be consistent with luminosity and energy development in pre-CDR for the accelerator being developed by C-AD.  Pre-CDR should be available in the next ~week, as C-AD has to deliver it to reviewers.

 

Nils + Christine will prepare information on the status of what is currently implemented in GEANT4, and on available event generators.

 

 

Nils – EIC-sPHENIX acceptance for electrons and identified hadrons

---------------------------------------------------------------------------------

Showed current detector layout and  x-Q2 acceptance.  Some gaps in coverage exist—as we move ahead with simulations, will see if makes sense to try to address and possibly how.

 

 

Xu Sun – Modular Ring-Imaging Cherenkov detector (mRICH) simulation

----------------------------------------------------------------------------------------

Mature GEANT implementation of standalone detector in Fun4All framework—full wall of modules, with lenses.  GEANT agrees well with test beam measurements performed at Fermilab and recently published in NIM.

 

Next steps – integrate into forward sPHENIX simulation with other detectors, study performance in combination with forward tracking.

 

 

Pawel Nadel-Turonsky – Geometry tagging with heavy ions at the EIC

------------------------------------------------------------------------------------

Technique of using nucleon tagging to get a handle on impact parameter b and/or path length in nucleus d.  Can select events via geometry tagging to reach the equivalent of higher center-of-mass energies.

 

Described methods using evaporated neutron tagging and using magnetic rigidity of a nuclear remnant.

 

Far forward proton tagging required for light nuclei.  Ability to veto nuclear breakup products needed for coherent nuclear diffraction studies to reduce incoherent background.

 

Nice outline of how forward and far-forward detection requirements are determined by light and heavy ion measurements.

 

 

Jin Huang – sPHENIX DAQ for EIC streaming readout

----------------------------------------------------------------

Event building may not be easy, given 10 ns bunch crossing time at eRHIC.  Streaming readout may be better option.

 

FELIX card developed at BNL for ATLAS for LHC running at high-luminosity in 2020s.  Good working relationship with group at BNL involved in this.

 

sPHENIX DAQ bandwidth looks promising to accommodate full EIC data without triggering, i.e. full streaming readout.  Particle rate estimates from back-of-the-envelope physics calculations, and examined as a function of pseudorapidity using simulations.  Data rate estimates using GEANT simulations including calorimetry and tracking so far.  May become a section in the LOI.  If can demonstrate that not only detector subsystems and magnet from sPHENIX can be reused, but also DAQ, will be valuable addition.  Demonstrating that full streaming readout is possible will furthermore address triggering issues, i.e. no need for triggering—read out everything and process via software.

 

 

--

Christine A. Aidala
Associate Professor
Department of Physics
University of Michigan
(734) 764-7611

 

 

From: sPHENIX-cold-QCD-l [mailto:sphenix-cold-qcd-l-bounces AT lists.bnl.gov] On Behalf Of Nils Feege
Sent: Thursday, March 29, 2018 12:14 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: [Sphenix-cold-qcd-l] Next sPHENIX Cold QCD TG meeting on Monday, April 2nd, evening at 8:30pm ET

 

Dear Cold QCD enthusiasts,

 

our next meeting is scheduled for

 

Monday, April 2nd, 8:30pm ET.

 

The meeting is BlueJeans only (https://bluejeans.com/345777492) with the agenda evolving at https://indico.bnl.gov/event/4464.

 

If you would like to present something (either at this meeting or at the next one on 4/16), please let Christine and me know and we will happily put your name on the agenda.

 

We look forward to hearing you at the meeting.

 

Best,

Christine Aidala & Nils Feege

Conveners sPHENIX Cold QCD Topical Group

 

--

Dr. Nils Feege

Research Assistant Professor

 

SUNY at Stony Brook

Department of Physics & Astronomy

Stony Brook, NY 11794-3800

 

e-mail nils.feege AT stonybrook.edu

skype nils1920

phone +1-631-632-8710

 

www.linkedin.com/in/nilsfeege