Overview

The Calibration for EPD in Run22 pp 500 GeV collisions is planned to be done in a "live" calibration manner, which means that most calibration has been done by the calibration team when the STAR was still taking data. This would save a lot of effort to regenerate the fast offline data for the purpose of calibration.

Under high collision energy at 500 GeV, a small bunch of tiles consumes most of the time for multi-Landau fitting to get a good 1-MIP value or to just decide as “bad” tiles, but overall EPD behaves well and calibration is smooth for most tiles, which are consistent through each calibration window.

EPD calibration team (Ding Chen, Xiaoyu Liu, Erik Loyd, Skipper Kagamaster, Cameron Racz)

The ADC distribution

An Example of EPD calibration

Gain Equalization 
The calibration process can be rereferred to the Skipper's post in isobar data EPD calibration:
https://drupal.star.bnl.gov/STAR/blog/skk317/epd-calibration-isobar-final

Anomalies
The EPD tiles which see no/few ADC distributions which would be marked as "bad". e.g.

Status
A list of calibration results

Xiaoyu: 1/2-1/8, 2/6-2/12, 3/13-3/19:

Day 2-8: https://drupal.star.bnl.gov/STAR/blog/lxy1122/EPD-live-calibration-2022

Day 37-43: https://drupal.star.bnl.gov/STAR/blog/lxy1122/EPD-live-calibration-2022

Day 72-78: https://drupal.star.bnl.gov/STAR/blog/lxy1122/EPD-live-calibration-2022

 Skipper: 1/9-1/15, 2/13-2/19, 3/20-3/26

Erik: 1/16-1/22, 2/20-2/26, 3/27-4/2

Day16-22:  https://drupal.star.bnl.gov/STAR/blog/eloyd/Run22-EPD-Live-Calibration-day-16-22

Day51-57: https://drupal.star.bnl.gov/STAR/blog/eloyd/Run22-EPD-Live-Calibration-day-51-57

Day86 - 92: https://drupal.star.bnl.gov/STAR/blog/eloyd/Run22-EPD-Live-Calibration-day-86-92

Three weeks:
https://drupal.star.bnl.gov/STAR/blog/eloyd/Run22-EPD-Calibration-3-weeks

Cameron: 1/23-1/29, 2/27-3/5, 4/3-4/9

Day 23-29: https://drupal.star.bnl.gov/STAR/blog/cracz/Run-22-EPD-Calibrations-Days-23-29

Ding: 1/30-2/5, 3/6-3/12, 4/10-4/16

Day1 and before: https://drupal.star.bnl.gov/STAR/blog/dchen/Run22-EPD-Live-Calibration-day-351-001

Day30-36: https://drupal.star.bnl.gov/STAR/blog/dchen/Run22-EPD-Live-Calibration-day-30-36

Summary
The calibration is mostly done, which should be good for trigger and physics analysis. thanks to all the contributions from the calibration team. Feel free to reach out if you have any questions or comments.