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Performance of a microstrip-coupled TES imaging module for CMB Polarimetry

Audley, Michael D., Glowacka, D., Goldie, D. J., Tsaneva, V., Withington, S., Piccirillo, Lucio, Pisano, Giampaolo, Grimes, P., Yassin, G., Ade, Peter A. R., North, C., Irwin, K. D. and Halpern, M. 2010. Performance of a microstrip-coupled TES imaging module for CMB Polarimetry. Presented at: 21st International Symposium on Space Terahertz Technology, Oxford, UK 23-25 MARCH, 2010, Oxford, UK, 23-25 March 2010.

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We have developed a 16-element, 97GHz, lownoise Transition Edge Sensor (TES) module that can be packed easily into large-format polarimetric imaging arrays. The technology was developed originally for the lowfrequency instrument of the CLOVER experiment, which was aimed at searching for the signature of primordial gravitational waves in the polarisation state of the Cosmic Microwave Background Radiation. Each module contains 16 slotline and microstrip-coupled TES bolometers, allowing eight polarimetric pixels with external waveguide OMTs, along with time-domain multiplexed SQUID readout. Here we describe the design of the modules, and explain how they were realised in practice, detailing some of the technology developed along the way. Performance was measured by following two parallel paths: (i) detailed characterisation of individual detectors using an exceedingly well understood, fully modelled, analogue SQUID readout system, and (ii) simultaneous measurements of the entire module using CLOVER's multichannel readout electronics. We describe the results of measurements on one of the modules, with an emphasis on uniformity of performance, and we assess the effect of non-uniformity on the operation of a complete array. Although the technology was developed in the context of CLOVER, the work has consequences for many instruments including future space telescopes such as BPol.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Last Modified: 04 Jun 2017 04:13

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