[asac][almanews] ALMA Memo 502 Released

[Stacy Oliver]

ALMA Memo # 502

ALMA Band 6 Prototype Cartridge: Design and Performance 

G. A. Ediss, M. Carter*, J. Cheng, J. E. Effland, W. Grammer, 
N. Horner, Jr., A. R. Kerr, D. Koller, E. F. Lauria, G. Morris, 
S-K. Pan, G. Reiland and M. Sullivan 

National Radio Astronomy Observatory 

*Institut de Radio Astronomique Millimetrique
300 rue de la Piscine
38406 St. Martin d'Heres, France 

2004-06-21

Keywords: millimeter-wave receivers, superconductor-insulator-superconductor
devices, radio astronomy 

This paper describes the design and performance of the initial Band 6
(211-275 GHz) ALMA cartridges. The incoming beam is coupled by 4-K
reflecting optics to a scalar horn followed by an orthomode transducer. Each
polarization is down-converted in a sideband-separating SIS mixer integrated
with a pair of 4-12 GHz IF preamplifiers. Stringent thermal management and
LO loss requirements are satisfied by using an overmoded stainless-steel
waveguide between the LO triplers on the 100-K stage and the 4-K mixers. For
ease of maintenance, all connections into the vacuum vessel are "blind
mating." 

View a pdf version of ALMA Memo #502. 
http://www.alma.nrao.edu/memos/html-memos/alma502/memo502.pdf

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