TES imaging array technology for CℓOVER
2006
C e OVER 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. C e OVER 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 C e OVER 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 C e OVER detectors, detector blocks, and readout, and give an update
on the detector development.
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