Abstract
We present new data on feedhorn-coupled transition-edge sensor devices fabricated for the second-generation receiver (ACTPol) for the Atacama cosmology telescope (ACT). First, we describe optical efficiency measurements of the latest ACTPol detector wafer, which has a 86±15 % average optical efficiency. Next, we discuss measurements of the TES resistance as a function of temperature and bias current (R (T, I)) using the ACTPol time-domain multiplexing electronics. Qualitative agreement between R (T, I) data at low bias current and the two-fluid model prediction is shown. Using the two-fluid model and low bias current R (T, I) data, α and β at our operating bias current are calculated.
Original language | English (US) |
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Pages (from-to) | 749-754 |
Number of pages | 6 |
Journal | Journal of Low Temperature Physics |
Volume | 176 |
Issue number | 5-6 |
DOIs | |
State | Published - Sep 2014 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics
Keywords
- ACTPol
- Atacama cosmology telescope
- Cosmic microwave background (CMB)
- Polarization
- Transition edge sensor (TES)