  CLOVER is an experiment which aims to detect the signature of gravitational
waves from inflation by measuring the B-mode polarization of the cosmic
microwave background. CLOVER consists of three telescopes operating at 97, 150,
and 220 GHz. The 97-GHz telescope has 160 horns in its focal plane while the
150 and 220-GHz telescopes have 256 horns each. The horns are arranged in a
hexagonal array and feed a polarimeter which uses finline-coupled TES
bolometers as detectors. To detect the two polarizations the 97-GHz telescope
has 320 detectors while the 150 and 220-GHz telescopes have 512 detectors each.
To achieve the required NEPs the detectors are cooled to 100 mK for the 97 and
150-GHz polarimeters and 230 mK for the 220-GHz polarimeter. Each detector is
fabricated as a single chip to guarantee fully functioning focal planes. The
detectors are contained in linear modules made of copper which form split-block
waveguides. The detector modules contain 16 or 20 detectors each for
compatibility with the hexagonal arrays of horns in the telescopes' focal
planes. Each detector module contains a time-division SQUID multiplexer to read
out the detectors. Further amplification of the multiplexed signals is provided
by SQUID series arrays. The first prototype detectors for CLOVER operate with a
bath temperature of 230 mK and are used to validate the detector design as well
as the polarimeter technology. We describe the design of the CLOVER detectors,
detector blocks, and readout, and give an update on the detector development.
