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Research
My research career has been dedicated to the design and construction of cutting edge telescopes and their associated instruments. Early on I focused on optical and infrared instruments, but in more recent years I have concentrated on millimeter-wave instruments (primarily in Chile) for experimental cosmology. Below is a brief description of current projects I am involved in.
Simons Observatory
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The Simons Observatory is an experiment dedicated to the observation of the Cosmic Microwave Background. It is comprised of a large aperture telescope (6 meter primary and secondary, shown on right) and multiple small aperture (0.4 meter) telescopes. This suite of telescopes and their associated cameras are being deployed to Cerro Toco in the Atacama Desert in Chile at an altitude of 5300 meters. Some of the many goals of the Simons Observatory include searching for signatures of primordial gravitational waves, constraining the sum of the neutrino masses, and refining our understanding of galaxy clusters.
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Atacama Cosmology Telescope​
The Atacama Cosmology Telescope is a 6-meter telescope on Cerro Toco in the Atacama Dessert. It is located at an elevation of 5200 meters and was designed to make high-resolution measurements of the CMB temperature and polarization anisotropies and detect massive galaxy clusters via the thermal Sunyaev Zel'dovich (tSZ) effect. I co-led the design of three generations of receivers for ACT. These receivers, operating in the 100 milli-Kelvin scale, provided the first evidence of Dark Energy using only the CMB data as well as the first detection of the gravitational lensing of the cosmic microwave background. More information can be found at http://www.princeton.edu/act/.
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