Sphenix-calibration-l mailing list

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

Dear Hugo,

I apologize if you are already preparing an abstract, but on the assumption 
that you are fully occupied with TPOT commissioning, I propose the following: 
 

Characterizing Time-Averaged Distortions in the sPHENXI TPC with the TPC 
Outer Tracker, Hugo Pereira Da Costa (LANL)

The sPHENIX Time Projection Chamber (TPC) serves as the main tracking 
detector of the sPHENIX experiment, which began operating at the Relativistic 
Heavy Ion Collider at Brookhaven National Lab this year.  It operates with a 
quadruple-GEM avalanche stage which provides gain while restricting the flow 
of ions back into the chamber sufficiently to operate in streaming mode, 
without any additional gating.  However, in order to reach its design 
performance, the time-varying distortions due to the fields of the remaining 
ion backflow and primary ionization must be monitored and corrected.  The 
slowly varying component of the distortions is monitored by the TPC Outer 
Tracker (TPOT), a micromegas-based detector which provides an additional 
spacepoint for tracks within a limited azimuthal range.  This spacepoint 
enables a data-driven extraction of the distortion vectors within the 
detector, which can then be extrapolated to the entire chamber.  This poster 
presents the design of the TPOT and methods used to extract the apporpriate 
corrections to these moderate-timescale distortions.

-Ross

==========
Dr. Ross Corliss
Research Assistant Professor
Center for Frontiers in Nuclear Science
Stony Brook University
virtual office:  
https://urldefense.com/v3/__https://stonybrook.zoom.us/my/rossoffice?pwd=ZmZ2SlRIMVFvUUJwbUkyOVNVTmE5QT09__;!!P4SdNyxKAPE!CMS8BAloIx0K0Q2XITSm5OKZ4TC6lsxE3gajAGE1jwHSwdkVbd3MZldBtcoUBbsSnX0OwGeXDSjB6QKuSM4Qim4Lh7k7a0prevU0fKALjKGBaw$