A Neutron Polarimeter for the Parity Violating Neutron Spin Rotation Measurement in Liquid $^{4}$He*

To better understand the N-N weak interaction, we performed an experiment on the NG-6 beamline at NCNR using polarized cold neutrons passing through a liquid $^{4}$He target to measure the parity violating spin rotation. This is the most sensitive neutron spin rotation experiment performed to date. The polarimeter is designed to isolate the parity-odd component of the rotation, cancel the Larmour precession background from residual magnetic fields to isolate the expected 10$^{-6}$ rad/m parity-odd signal, and reduce nonstatistical noise from neutron source intensity fluctuations. We will discuss the design and operation of the neutron polarimeter.