The 1.1 mm continuum camera, AzTEC, installed in the scientific-instruments room of the LMT.

AzTEC

AzTEC is a 144-pixel millimeter-wavelength camera that operates at 1.1 mm. The detector array is cooled to ~250 mK via a three-stage, closed-cycle 3He refrigerator. Radiation is coupled to Si-Ni “spider-web” bolometers, arranged in a close-packed hexagonal pattern, with an array of conical feedhorns separated by 1.4 λ. Scanning of the telescope or movements of the secondary mirror provide fully-sampled images.

The current optical design and coupling to the telescopes allows AzTEC to illuminate only the inner 32m of the primary surface, resulting in a FWHM beam-size of 8.5 arcsecs.

AzTEC was successfully installed and commissioned at the JCMT in June 2005, and undertook an extensive program of guest observations on the JCMT in November & December 2005. AzTEC has also operated as a guest instrument on the Atacama Submillimeter Telescope Experiment (ASTE) at the ALMA site in northern Chile for two winters (2007-2008). The AzTEC camera has been developed at UMass Amherst in collaboration with the BOLOCAM instrument team. More information about the instrument is available at the AzTEC website.

The following link provides AzTEC sensitivity and integration-time calculators, considering the latest values of surface accuracy and efficiency for the inner 32m diameter primary surface illuminated by AzTEC. These AzTEC calculators are also available in LMT-Hedwig, the LMT’s proposal submission system.