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In its initial deployment, the Non-Imaging CHErenkov Array (NICHE)willmeasure the flux and nuclear composition of cosmic rays from below 10^16 eV to10^18 eV by using measurements of the amplitude and time-spread of theair-shower Cherenkov signal to achieve a robust event-by-event measurement ofXmax and energy. NICHE will have sufficient area and angular acceptance to havesignificant overlap with TA/TALE, within which NICHE is located, to allow forenergy cross-calibration. In order to quantify NICHE's ability to measure thecosmic ray nuclear composition, 4-component composition models were constructedbased upon a poly-gonato model of J. Hoerandel using simulated Xmaxdistributions of the composite composition as a function of energy. Thesecomposition distributions were then unfolded into individual components via ananalysis technique that included NICHE's simulated Xmax and energy resolutionperformance as a function of energy as well as the effects of finite eventstatistics. Details of the construction of the 4-component composition modelsand NICHE's ability to determine the individual components as a function ofenergy are presented.

The modeling of the nuclear composition measurement performance of the Non-Imaging CHErenkov Array (NICHE)