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Spider is a long-duration, balloon-borne polarimeter designed to measurelarge scale Cosmic Microwave Background (CMB) polarization with very highsensitivity and control of systematics. The instrument will map over half thesky with degree angular resolution in I, Q and U Stokes parameters, in fourfrequency bands from 96 to 275 GHz. Spider's ultimate goal is to detect theprimordial gravity wave signal imprinted on the CMB B-mode polarization. One ofthe challenges in achieving this goal is the minimization of the contaminationof B-modes by systematic effects. This paper explores a number of instrumentsystematics and observing strategies in order to optimize B-mode sensitivity.This is done by injecting realistic-amplitude, time-varying systematics in aset of simulated time-streams. Tests of the impact of detector noisecharacteristics, pointing jitter, payload pendulations, polarization angleoffsets, beam systematics and receiver gain drifts are shown. Spider's defaultobserving strategy is to spin continuously in azimuth, with polarizationmodulation achieved by either a rapidly spinning half-wave plate or a rapidlyspinning gondola and a slowly stepped half-wave plate. Although the latter ismore susceptible to systematics, results shown here indicate that either modeof operation can be used by Spider.

Spider Optimization: Probing the Systematics of a Large Scale B-Mode Experiment