Development of readout electronics for POLARBEAR-2 cosmic microwave background experiment
- The Univ. of Tokyo, Kashiwa (Japan)
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of California, Berkeley, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- McGill Univ., Montreal, QC (Canada)
- Univ. of California, San Diego, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Dalhousie Univ., Halifax (Canada)
The readout of transition-edge sensor (TES) bolometers with a large multiplexing factor is key for the next generation cosmic microwave background (CMB) experiment, Polarbear-2, having 7588 TES bolometers. To enable the large arrays, we have been developing a readout system with a multiplexing factor of 40 in the frequency domain. Extending that architecture to 40 bolometers requires an increase in the bandwidth of the SQUID electronics, above 4 MHz. This paper focuses on cryogenic readout and shows how it affects cross talk and the responsivity of the TES bolometers. A series resistance, such as equivalent series resistance of capacitors for LC filters, leads to non-linear response of the bolometers. A wiring inductance modulates a voltage across the bolometers and causes cross talk. They should be controlled well to reduce systematic errors in CMB observations. As a result, we have been developing a cryogenic readout with a low series impedance and have tuned bolometers in the middle of their transition at a high frequency (>3 MHz).
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1346074
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 184; ISSN 0022-2291
- Publisher:
- Plenum PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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