Kavli Affiliate: Jacqueline N. Hewitt
| First 5 Authors: Lindsay M. Berkhout, Daniel C. Jacobs, Zuhra Abdurashidova, Tyrone Adams, James E. Aguirre
| Summary:
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.
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