The Millimeter Bolometer Array Camera (MBAC) was commissioned in the fall of 2007 on the new 6-meter Atacama Cosmology Telescope (ACT). The MBAC on the ACT will map the temperature anisotropies of the Cosmic Microwave Background (CMB) with arc-minute resolution. For this ¯rst observing season, the MBAC contained a di®raction-limited, 32 by 32 element, focal plane array of Transition Edge Sensor (TES) bolometers for observations at 145 GHz. This array was coupled to the telescope with a series of cold, refractive, reimaging optics. To meet the performance speci¯cations, the MBAC employs four stages of cooling using closed-cycle 3He/4He sorption fridge systems in combination with pulse tube coolers. In this paper we present the design of the instrument and discuss its performance during the ¯rst observing season. Finally, we report on the status of the MBAC for the 2008 observing season, when the instrument will be upgraded to a total of three separate 1024-element arrays at 145 GHz, 220 GHz and 280 GHz.
Instrument design, characterization of the Millimeter Bolometer Array Camera on the Atacama Cosmology Telescope / D. S., S., P. A. R., A., C., A., M., A., J., A., Battistelli, E.S., B., B., J., C., A. J., D., S., D., S., D., M. J., D., S. R., D., W. B., D., R., D., T., E.H., R. P., F., J. W., F., X., G., A., H., et al.. - 7020:(2008), pp. 702008-702008-12. (SPIE FRANCIA ) [10.1117/12.789876].
Instrument design, characterization of the Millimeter Bolometer Array Camera on the Atacama Cosmology Telescope
BATTISTELLI, Elia Stefano;
2008
Abstract
The Millimeter Bolometer Array Camera (MBAC) was commissioned in the fall of 2007 on the new 6-meter Atacama Cosmology Telescope (ACT). The MBAC on the ACT will map the temperature anisotropies of the Cosmic Microwave Background (CMB) with arc-minute resolution. For this ¯rst observing season, the MBAC contained a di®raction-limited, 32 by 32 element, focal plane array of Transition Edge Sensor (TES) bolometers for observations at 145 GHz. This array was coupled to the telescope with a series of cold, refractive, reimaging optics. To meet the performance speci¯cations, the MBAC employs four stages of cooling using closed-cycle 3He/4He sorption fridge systems in combination with pulse tube coolers. In this paper we present the design of the instrument and discuss its performance during the ¯rst observing season. Finally, we report on the status of the MBAC for the 2008 observing season, when the instrument will be upgraded to a total of three separate 1024-element arrays at 145 GHz, 220 GHz and 280 GHz.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
