http://cso.caltech.edu/wiki/ 2026-08-24T21:48:49+00:00 http://cso.caltech.edu/wiki/ http://cso.caltech.edu/wiki/lib/tpl/cso/images/favicon.ico text/html 2013-05-31T20:34:52+00:00 http://cso.caltech.edu/wiki/cso/instruments/cryogens?rev=1370032492&do=diff Cryogen usage Approximate cryogen consumption and service frequency for CSO instruments. Instrument Precool and Initial Subsequent Frequency LHe LN2 LHe LN2 Bolocam 85 80 25 5 daily Sharc II 60 110 text/html 2014-11-03T23:07:00+00:00 http://cso.caltech.edu/wiki/cso/instruments/instruments?rev=1415056020&do=diff Instruments [Instrumentation at the CSO] (brochure) The CSO consists of a 10.4 m diameter Leighton telescope housed in a compact dome at 4070 m altitude near the summit of Mauna Kea, Hawaii. Instruments mounted at the Cassegrain and Nasmyth foci support spectroscopy and continuum imaging at wavelengths between 2 mm and 350 μm. Observations are carried out at night. The median zenith precipitable water vapor (PWV) is about 2 mm and short wavelength (350 μm) observations are possible when th… text/html 2014-09-30T00:05:33+00:00 http://cso.caltech.edu/wiki/cso/instruments/tippers?rev=1412035533&do=diff Tipping Radiometers Two instruments use the skydip technique to measure the atmospheric transparency at the CSO. Both instruments were originally developed at the NRAO. One is a narrowband heterodyne radiometer tuned to 225 GHz. This has been operating almost continuously since it was installed in 1989. Versions of this instrument have been operated at other astronomical sites including the South Pole and the Chajnantor Plateau in Chile.