Optimization and sensitivity of the Keck Array
  The Keck Array (SPUD) began observing the cosmic microwave background's
polarization in the winter of 2011 at the South Pole. The Keck Array follows
the success of the predecessor experiments Bicep and Bicep2, using five on-axis
refracting telescopes. These have a combined imaging array of 2500
antenna-coupled TES bolometers read with a SQUID-based time domain multiplexing
system. We will discuss the detector noise and the optimization of the readout.
The achieved sensitivity of the Keck Array is 11.5 {\mu}K_(CMB)*sqrt{s} in the
2012 configuration.
