Understanding the gain characteristics of GEMs inside the Hadron Blind Detector in PHENIX

W. Anderson, B. Azmoun, C. Y. Chi, Z. Citron, A. Dubey, J. M. Durham, Z. Fraenkel, T. Hemmick, J. Kamin, A. Kozlov, A. Milov, M. Naglis, R. Pisani, I. Ravinovich, T. Sakaguehi, D. Sharma, A. Sickles, I. Tserruya, C. Woody