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Current attempts to measure the 21cm Power Spectrum of neutral hydrogenduring the Epoch of Reionization are limited by systematics which producemeasured upper limits above both the thermal noise and the expectedcosmological signal. These systematics arise from a combination ofobservational, instrumental, and analysis effects. In order to furtherunderstand and mitigate these effects, it is instructive to explore differentaspects of existing datasets. One such aspect is the choice of observing field.To date, MWA EoR observations have largely focused on the EoR0 field. In thiswork, we present a new detailed analysis of the EoR1 field. The EoR1 field isone of the coldest regions of the Southern radio sky, but contains the verybright radio galaxy Fornax-A. The presence of this bright extended source inthe primary beam of the interferometer makes the calibration and analysis ofEoR1 particularly challenging. We demonstrate the effectiveness of a recentlydeveloped shapelet model of Fornax-A in improving the results from this field.We also describe and apply a series of data quality metrics which identify andremove systematically contaminated data. With substantially improved sourcemodels, upgraded analysis algorithms and enhanced data quality metrics, wedetermine EoR power spectrum upper limits based on analysis of the best$\sim$14-hours data observed during 2015 and 2014 at redshifts 6.5, 6.8 and7.1, with the lowest $2\sigma$ upper limit at z=6.5 of $\Delta^2 \leq (73.78~\mathrm{mK)^2}$ at $k=0.13~\mathrm{h~ Mpc^{-1}}$, improving on previous EoR1measurement results.

Epoch of Reionization Power Spectrum Limits from Murchison Widefield Array Data Targeted at EoR1 Field