High Impedance TES Bolometers for EDELWEISS

Superconducting Tes Bolometers above 1k

The discovery of High Tc superconductivity led to the exploration of current-biased superconducting bolometers cooled with liquid nitrogen and optimized to view 300K backgrounds at wavelengths beyond 10 μm. If such detectors reach the thermal fluctuation noise limit they would be a great improvement over room temperature pyroelectric detectors and thermopiles for many applications. The supercon...

A time domain multiplexer for large arrays of high impedance low temperature bolometers

Design and characterization of TES bolometers and SQUID readout electronics for a balloon-borne application

We present measurements of the electrical and thermal properties of new arrays of bolometeric detectors that were fabricated as part of a program to develop bolometers optimized for the low photon background of the EBEX balloon-borne experiment. An array consists of 140 spider-web transition edge sensor bolometers microfabricated on a 4” diameter silicon wafer. The designed average thermal cond...

A Kilopixel Array of TES Bolometers for ACT: Development, Testing, and First Light

The Millimeter Bolometer Array Camera (MBAC) will be installed on the 6-meter Atacama Cosmology Telescope (ACT) in late 2007. For the first season of observations, MBAC will comprise a 145 GHz diffraction-limited, 1024-pixel, focal plane array of Transition Edge Sensor (TES) Bolometers. This will be the largest array of pop-up-detector bolometers ever fielded as well as one of the largest array...

IF impedance and mixer gain of NbN hot electron bolometers

The intermediate frequency IF characteristics, the frequency dependent IF impedance, and the mixer conversion gain of a small area hot electron bolometer HEB have been measured and modeled. The device used is a twin slot antenna coupled NbN HEB mixer with a bridge area of 1 0.15 m2, and a critical temperature of 8.3 K. In the experiment the local oscillator frequency was 1.300 THz, and the IF 0...