Open Access Publications from the University of California

## Measurement of the B-mode power spectrum with POLARBEAR

• Author(s): Steinbach, Bryan
This dissertation describes the design, integration and results of the first season of \pb observations. The receiver observed for 1 year with a noise-equivalent temperature (NET) of $22.8\mu K \sqrt{s}$ and mapped a 30 square degree area of the CMB, obtaining evidence for gravitational lensing in the BB power spectrum at a significance of $2\sigma$.