Measurements of AlMn TES bolometers well described by simple electrothermal model

Samantha Walker; Jason E. Austermann; James A. Beall; Bradley J. Dober; Shannon M. Duff; Gene C. Hilton; Johannes Hubmayr; Joel N. Ullom; Jeffrey L. Van Lanen; Michael R. Vissers

doi:10.1117/12.2576274

22 January 2021 Measurements of AlMn TES bolometers well described by simple electrothermal model

Samantha Walker, Jason E. Austermann, James A. Beall, Bradley J. Dober, Shannon M. Duff, Gene C. Hilton, Johannes Hubmayr, Joel N. Ullom, Jeffrey L. Van Lanen, Michael R. Vissers

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 1145326 (2021) https://doi.org/10.1117/12.2576274
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Cosmic microwave background (CMB) polarization experiments utilize arrays of low temperature detectors, such as superconducting transition-edge sensor (TES) bolometers. Voltage-biased TES bolometers must be embedded in a readout circuit that allows for stable operation. To ensure stability and to test our physical and electrothermal model of these devices, measurements aimed at characterizing the dynamics of the sensor over the range of detector bias and loading conditions relevant to our application are carried out for multiple bolometer designs. In this work, we present bolometer electrothermal properties derived from current-voltage curves, effective electrothermal time constant measurements, and complex impedance measurements of AlMn TES bolometers intended for the Ali CMB Polarization Telescope (AliCPT). All bolometers consist of 385nm thick 1400 ppma AlMn film with measured superconducting critical temperature T_c = 480 mK. The bolometers are well-described by a simple, one-pole electrothermal model with a natural time constant τ₀ that we adjust by varying the leg geometry and the amount of PdAu thermal ballast on the bolometer island. From these measurements, we determine that the volumetric heat capacity of sputtered PdAu (atomic percentages 67.6%/32.4%) at 480mK is 0.22 fJ/(K·μm³). Finally, we present the TES parameters as a function of operational resistance and over a range of loading conditions.

Citation Download Citation

Samantha Walker, Jason E. Austermann, James A. Beall, Bradley J. Dober, Shannon M. Duff, Gene C. Hilton, Johannes Hubmayr, Joel N. Ullom, Jeffrey L. Van Lanen, and Michael R. Vissers "Measurements of AlMn TES bolometers well described by simple electrothermal model", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 1145326 (22 January 2021); https://doi.org/10.1117/12.2576274

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available