Research Areas 

Cosmology, astrophysics, and fundamental physics: studying inflation, dark energy, dark matter, neutrinos, galaxy clusters, and galaxy evolution using cosmic microwave background (CMB) and sub-millimeter measurements. Detector arrays and applied superconductivity: low-temperature detector arrays, superconducting detectors, transition-edge sensor (TES) bolometers, SQUID measurement systems, device physics, sub-Kelvin refrigeration. Astronomical optics and receivers: optics design, optical coatings, material properties, cryogenic instruments.


Primary Collaborations 

ACTPol and Advanced ACTPol : Two phases of polarization-sensitive measurements using the 6-meter Atacama Cosmology Telescope (photo above) to probe inflation, neutrinos, early dark enegy, and galaxy clusters via the small angular scale CMB polarization. Initial ACTPol observations began in 2013. Advanced ACTPol observations began in 2016.

CCAT-prime: A new paradigm for the CCAT Observatory that is based on the high-throughput 6-meter aperture Fred Young Submillimeter Telescope (FYST), which evolved from designs described in Niemack (2016) and Parshley et al. (2018)

Simons Observatory: The ACT and Simons Array teams are joining to develop the next stage of CMB project!

CMB Stage IV: The ultimate ground-based CMB observatory will require many telescopes at multiple sites to achieve the exciting science described here. The CMB-S4 Concept Definition Task Force (CDT) was formed in Dec. 2016.

NIST Quantum Sensors: Developing CMB polarimenters, microwave detectors, and SQUID multiplexing techniques for readout of large superconducting detector arrays


Additional (and Past) Collaborations 

Atacama B-mode Search: An instrument with approximately 1/2 degree resolution to probe inflation via the large scale CMB polarization

BFORE (the B-mode Foreground Experiment): A proposed NASA balloon-borne observatory to measure the high-frequency foregrounds contaminating probes of large-angular-scale B-modes from inflation.

DeLITE (the DeLensing Inflation by Tomography Experiment): A proposed balloon-borne observatory to make a high signal-to-noise measurement of CMB gravitational lensing, enabling a sensitive search for "the smoking gun of inflation" - the signature of primordial inflationary gravity waves in the CMB polarization

SCUBA-2: A sub-millimeter instrument on the James Clerk Maxwell Telescope on Mauna Kea, Hawaii with the largest arrays of superconducting detectors in the world (~10,000 detectors total, operating at 450 and 850 microns).

SPTPol: A new receiver to measure CMB polarization on the 10-meter South Pole Telescope

Truce Collaboration: Developing feedhorn-coupled superconducting TES polarimeter arrays for CMB research

ZEUS-2: a second generation submillimeter grating spectrometer for the Caltech Submillimeter Observatory and the Atacama Pathfinder Experiment

350 GHz remote human imager: A millimeter-wave security video imaging system using transition-edge sensor detectors