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This work describes a new instrument optimized for a detection of the neutralhydrogen 21cm power spectrum between redshifts of 0.5-1.5: the Baryon AcousticOscillation Broadband and Broad-beam (BAOBAB) Array. BAOBAB will build on theefforts of a first generation of 21cm experiments which are targeting adetection of the signal from the Epoch of Reionization at z ~ 10. At z ~ 1, theemission from neutral hydrogen in self-shielded overdense halos also presentsan accessible signal, since the dominant, synchrotron foreground emission isconsiderably fainter than at redshift 10. The principle science driver forthese observations are Baryon Acoustic Oscillations in the matter powerspectrum which have the potential to act as a standard ruler and constrain thenature of dark energy. BAOBAB will fully correlate dual-polarization antennatiles over the 600-900MHz band with a frequency resolution of 300 kHz and asystem temperature of 50K. The number of antennas will grow in stageddeployments, and reconfigurations of the array will allow for both traditionalimaging and high power spectrum sensitivity operations. We present calculationsof the power spectrum sensitivity for various array sizes, with a 35-elementarray measuring the cosmic neutral hydrogen fraction as a function of redshift,and a 132-element system detecting the BAO features in the power spectrum,yielding a 1.8% error on the z ~ 1 distance scale, and, in turn, significantimprovements to constraints on the dark energy equation of state over anunprecedented range of redshifts from ~0.5-1.5.

The Baryon Acoustic Oscillation Broadband and Broad-beam Array: Design Overview and Sensitivity Forecasts