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CLOVER is an experiment which aims to detect the signature of gravitationalwaves from inflation by measuring the B-mode polarization of the cosmicmicrowave 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 the150 and 220-GHz telescopes have 256 horns each. The horns are arranged in ahexagonal array and feed a polarimeter which uses finline-coupled TESbolometers as detectors. To detect the two polarizations the 97-GHz telescopehas 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 and150-GHz polarimeters and 230 mK for the 220-GHz polarimeter. Each detector isfabricated as a single chip to guarantee fully functioning focal planes. Thedetectors are contained in linear modules made of copper which form split-blockwaveguides. The detector modules contain 16 or 20 detectors each forcompatibility with the hexagonal arrays of horns in the telescopes' focalplanes. Each detector module contains a time-division SQUID multiplexer to readout the detectors. Further amplification of the multiplexed signals is providedby SQUID series arrays. The first prototype detectors for CLOVER operate with abath temperature of 230 mK and are used to validate the detector design as wellas the polarimeter technology. We describe the design of the CLOVER detectors,detector blocks, and readout, and give an update on the detector development.Comment: 9 pages, 7 figures, SPIE Orlando 24-31 May 2006, Conference 627

TES imaging array technology for C ℓ OVER