Optics Study for ALMA Receivers

ALMA Memo No. 324 Proposal for ALMA Front End Optics

Antenna beam pattern evaluation of ALMA band 9 subsystem

This report describes band 9 beam pattern measurements which were made at NA ALMA front end integration center during the visit of ALMA band 9 group representatives from 2 to 7 of June 2008. The Band 9 cartridge system was mounted within ALMA front end cryostat #2 and the overall system included the cryostat window and filters. Measurement set-up, experiment condition and sequence and results o...

Some biological parameters of Silver Crucian carp, Carassius auratus, in the international wetlands of Alma-Gol and Ala-Gol (Golestan Province, Iran)

In the present study, age, growth and reproduction of Carassius auratus were investigated in the Alma-Gol and Ala-Gol (northern Iran) from September 2000 to August 2002. Among the total of 1450 specimens, the estimated ages ranged from 0+ to 8+ years. C. auratus showed an allometric growth, negatively in Alma-Gol and positively in Ala-Gol. The von Bertalanffy growth curves were fitted to mean t...

ALMA Receiver Optics Design

A Workshop was held in Tucson in September 2000 to define a layout for the optics and dewar. Section 3 lists the design goals for the Workshop, and the configuration that emerged is detailed in this document. This includes the overall arrangement, and the details of the optics of the individual Bands. These bands are those defined by Wootten et al. [1] and endorsed with minor adjustment for Ban...

An SIS-based sideband-separating heterodyne mixer optimized for the 600 to 720 GHz band

The Atacama Large Millimeter Array (ALMA) is the largest radio astronomical enterprise ever proposed. When completed, each of its 64 constituting radio-telescopes will be able to hold 10 heterodyne receivers covering the spectroscopic windows allowed by the atmospheric transmission at the construction site, the altiplanos of the northern Chilean Andes. In contrast to the sideband-separating (2S...