Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning
Creators: name: Berkhout, Lindsay M.
name: Jacobs, Daniel C.
name: Abdurashidova, Zuhra
name: Adams, Tyrone
name: Aguirre, James E.
name: Alexander, Paul
name: Ali, Zaki S.
name: Baartman, Rushelle
name: Balfour, Yanga
name: Beardsley, Adam P.
name: Bernardi, Gianni
name: Billings, Tashalee S.
name: Bowman, Judd D.
name: Bradley, Richard F.
name: Bull, Philip
name: Burba, Jacob
name: Carey, Steven
name: Carilli, Chris L.
name: Chen, Kai-Feng
name: Cheng, Carina
name: Choudhuri, Samir
name: DeBoer, David R.
name: Acedo, Eloy de Lera
name: Dexter, Matt
name: Dillon, Joshua S.
name: Dynes, Scott
name: Eksteen, Nico
name: Ely, John
name: Ewall-Wice, Aaron
name: Fagnoni, Nicolas
name: Fritz, Randall
name: Furlanetto, Steven R.
name: Gale-Sides, Kingsley
name: Garsden, Hugh
name: Gehlot, Bharat Kumar
name: Ghosh, Abhik
name: Glendenning, Brian
name: Gorce, Adelie
name: Gorthi, Deepthi
name: Greig, Bradley
name: Grobbelaar, Jasper
name: Halday, Ziyaad
name: Hazelton, Bryna J.
name: Hewitt, Jacqueline N.
name: Hickish, Jack
name: Huang, Tian
name: Josaitis, Alec
name: Julius, Austin
name: Kariseb, MacCalvin
name: Kern, Nicholas S.
name: Kerrigan, Joshua
name: Kim, Honggeun
name: Kittiwisit, Piyanat
name: Kohn, Saul A.
name: Kolopanis, Matthew
name: Lanman, Adam
name: La Plante, Paul
name: Liu, Adrian
name: Loots, Anita
name: Ma, Yin-Zhe
name: MacMahon, David Harold Edward
name: Malan, Lourence
name: Malgas, Cresshim
name: Malgas, Keith
name: Marero, Bradley
name: Martinot, Zachary E.
name: Mesinger, Andrei
name: Molewa, Mathakane
name: Morales, Miguel F.
name: Mosiane, Tshegofalang
name: Murray, Steven G.
name: Neben, Abraham R.
name: Nikolic, Bojan
name: Nunhokee, Chuneeta Devi
name: Nuwegeld, Hans
name: Parsons, Aaron R.
name: Pascua, Robert
name: Patra, Nipanjana
name: Pieterse, Samantha
name: Qin, Yuxiang
name: Rath, Eleanor
name: Razavi-Ghods, Nima
name: Riley, Daniel
name: Robnett, James
name: Rosie, Kathryn
name: Santos, Mario G.
name: Sims, Peter
name: Singh, Saurabh
name: Storer, Dara
name: Swarts, Hilton
name: Tan, Jianrong
name: Thyagarajan, Nithyanandan
name: van Wyngaarden, Pieter
name: Williams, Peter K. G.
name: Zheng, Haoxuan
name: Xu, Zhilei
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: This paper presents the design and deployment of the Hydrogen Epoch of Reionization Array (HERA) phase II system. HERA is designed as a staged experiment targeting 21 cm emission measurements of the Epoch of Reionization. First results from the phase I array are published as of early 2022, and deployment of the phase II system is nearing completion. We describe the design of the phase II system and discuss progress on commissioning and future upgrades. As HERA is a designated Square Kilometer Array (SKA) pathfinder instrument, we also show a number of "case studies" that investigate systematics seen while commissioning the phase II system, which may be of use in the design and operation of future arrays. Common pathologies are likely to manifest in similar ways across instruments, and many of these sources of contamination can be mitigated once the source is identified.