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The Primordial Inflation Explorer (PIXIE) is an Explorer-class missionconcept to measure the spectrum and polarization of the cosmic microwavebackground. Cosmological signals are small compared to the instantaneousinstrument noise, requiring strict control of instrumental signals. Theinstrument design provides multiple levels of null operation, signalmodulation, and signal differences, with only few-percent systematic errorsuppression required at each level. Jackknife tests based on discreteinstrument symmetries provide an independent means to identify, model, andremove remaining instrumental signals. We use detailed time-orderedsimulations, including realistic performance and tolerance parameters, toevaluate the instrument response to broad classes of systematic errors for bothspectral distortions and polarization. The largest systematic errors contributeadditional white noise at the few-percent level compared to the dominant photonnoise. Coherent instrumental effects which do not integrate down are smallerstill, and remain several orders of magnitude below the targeted cosmologicalsignals.

Systematic error mitigation for the PIXIE Fourier transform spectrometer