We have developed and tested an antireflection (AR) coating method for silicon lenses used at cryogenic temperatures and millimeter wavelengths. Our particular application is a measurement of the cosmic microwave background. The coating consists of machined pieces of Cirlex glued to the silicon. The measured reflection from an AR-coated flat piece is less than 1.5% at the design wavelength. The coating has been applied to flats and lenses and has survived multiple thermal cycles from 300 to 4 K. We present the manufacturing method, the material properties, the tests performed, and estimates of the loss that can be achieved in practical lenses.
We present measurements of the auto- and cross-frequency correlation power
Spectra of the cosmic (sub)millimeter background at: 250, 350, and 500 um
(1200, 860, and 600 GHz) from observations made with the Balloon-borne Large
Aperture Submillimeter Telescope, BLAST; and at 1380 and 2030 um (218 and...
We present the angular power spectra derived from the 7-year maps
And discuss the cosmological conclusions that can be inferred from WMAP data
Alone. The third acoustic peak in the TT spectrum is now well measured by WMAP.
In the context of a flat LambdaCDM model, this improvement allows us to place...
We are at the dawn of a new era in which hundreds of square degrees of sky
Can be mapped with arcminute resolution and sensitivities measured in
MicroKelvin. Acquiring these data requires the use of special purpose
Telescopes such as the Atacama Cosmology Telescope (ACT), located in Chile, and
Pubget Updates sends you emails when Pubget finds new papers that match your search. Use Pubget Updates to get the latest articles for your specialty, written by a colleague, or published by your favorite journals.