sPHENIX is a new detector at RHIC.

[Ross Corliss <ross.corliss AT stonybrook.edu>]

Hi Nathan,

It looks solid.  Still, a few comments:

Light produced in the calorimeters *is* read out by Silicon Photomultipliers (SiPMs). 

There is one missing beat in the description of the calorimeter, namely that they measure the energy of particles from the collisions through the amount of light those particles emit.

Also, although 'ADC' is a term of craft, it might be more accessible to say that changes in the SiPM gain lead to changes in the apparent light yield, or similar, and so must be monitored/understood so the two effects can be told apart.  

Some description of what mechanisms are used to monitor the gain would also be welcome.

-Ross

==========
Dr. Ross Corliss
Research Assistant Professor
Center for Frontiers in Nuclear Science
Stony Brook University
virtual office:  https://stonybrook.zoom.us/my/rossoffice?pwd=ZmZ2SlRIMVFvUUJwbUkyOVNVTmE5QT09

On Aug 1, 2023, at 4:39 AM, Nathan Grau via sPHENIX-l <sphenix-l AT lists.bnl.gov> wrote:

Hi all,

Since this abstract overlaps with another, we have reworked it to be more specific to what Mirella has worked one.

Thanks,

Nathan

Stability of the Outer Hadronic Calorimeter in the sPHENIX Experiment Au+Au 2023 Run

Mirella Lajos

Collisions of relativistic heavy ions produce temperatures high enough to create a quark-gluon plasma (QGP), a state of matter not seen since the early universe. sPHENIX, the most recent experiment added to the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, is used to study the QGP. The calorimeter system of the detector, which includes in order or increasing radius the electromagnetic calorimeter, the inner hadronic calorimeter, and the outer hadronic calorimeter, can measure the energy of particles that emerge from the Au+Au collisions. Light produced in the calorimeters are read out by Silicon Photomultipliers (SiPMs). SiPMs gains are affected by radiation damage and temperature. Any variation of these could affect the raw ADC distributions. In this poster, we study how stable the outer hadronic calorimeter is through the 2023 Au+Au commissioning run.

On Mon, Jul 31, 2023 at 3:04 PM Nathan Grau <ngrau AT augie.edu> wrote:

Hi all,

One of my students, Mirella Lajos, would like to submit an abstract for the CEU at DNP on some work she has been doing on the commissioning. Abstracts are due Wednesday August 2 by 5 PM. Any and all comments are welcome.

Thanks,

Nathan

Commissioning of the Outer Hadronic Calorimeter in the sPHENIX Experiment Au+Au 2023 Run

Mirella Lajos

Collisions of relativistic heavy ions produce temperatures high enough to create quark-gluon plasma (QGP), a state of matter not seen since the early universe. sPHENIX, the most recent experiment added to the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, is used to study QGP. The calorimeter system of the detector can measure the energy of particles that spray out from gold ion collisions. In this poster, we show the current results of the commissioning, such as the stability of the Outer Hadronic Calorimeter throughout the 2023 Au+Au commissioning run.

--

Nathan Grau (he/him/his)

Associate Professor and Chair

Department of Physics

Augustana University

2001 S Summit Ave

Sioux Falls, SD 57197
(605) 274-5012

Strengths: Learner, Focus, Achiever, Strategic, Futuristic

--

Nathan Grau (he/him/his)

Associate Professor and Chair

Department of Physics

Augustana University

2001 S Summit Ave

Sioux Falls, SD 57197
(605) 274-5012

Strengths: Learner, Focus, Achiever, Strategic, Futuristic

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