2015A&A...577A.129B


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET22:55:56

2015A&A...577A.129B - Astronomy and Astrophysics, volume 577A, 129-129 (2015/5-1)

The ALMA Band 9 receiver. Design, construction, characterization, and first light.

BARYSHEV A.M., HESPER R., MENA F.P., KLAPWIJK T.M., VAN KEMPEN T.A., HOGERHEIJDE M.R., JACKSON B.D., ADEMA J., GERLOFSMA G.J., BEKEMA M.E., BARKHOF J., DE HAAN-STIJKEL L.H.R., VAN DEN BEMT M., KOOPS A., KEIZER K., PIETERS C., KOOPS VAN HET JAGT J., SCHAEFFER H.H.A., ZIJLSTRA T., KROUG M., LODEWIJK C.F.J., WIELINGA K., BOLAND W., DE GRAAUW M.W.M., VAN DISHOECK E.F., JAGER H. and WILD W.

Abstract (from CDS):

We describe the design, construction, and characterization of the Band 9 heterodyne receivers (600-720GHz) for the Atacama Large Millimeter/submillimeter Array (ALMA). First-light Band 9 data, obtained during ALMA commissioning and science verification phases, are presented as well. The ALMA Band 9 receiver units (so-called ''cartridges''), which are installed in the telescope's front end, have been designed to detect and down-convert two orthogonal linear polarization components of the light collected by the ALMA antennas. The light entering the front end is refocused with a compact arrangement of mirrors, which is fully contained within the cartridge. The arrangement contains a grid to separate the polarizations and two beam splitters to combine each resulting beam with a local oscillator signal. The combined beams are fed into independent double-sideband mixers, each with a corrugated feedhorn coupling the radiation by way of a waveguide with backshort cavity into an impedance-tuned superconductor-insulator-superconductor (SIS) junction that performs the heterodyne down-conversion. Finally, the generated intermediate frequency (IF) signals are amplified by cryogenic and room-temperature HEMT amplifiers and exported to the telescope's IF back end for further processing and, finally, correlation. The receivers have been constructed and tested in the laboratory and they show an excellent performance, complying with ALMA requirements. Performance statistics on all 73 Band 9 receivers are reported. Importantly, two different tunnel-barrier technologies (necessitating different tuning circuits) for the SIS junctions have been used, namely conventional AlOx barriers and the more recent high-current-density AlN barriers. On-sky characterization and tests of the performance of the Band 9 cartridges are presented using commissioning data. Continuum and line images of the low-mass protobinary IRAS 16293-2422 are presented which were obtained as part of the ALMA science verification program. An 8GHz wide Band 9 spectrum extracted over a 0.3"x0.3" region near source B, containing more than 100 emission lines, illustrates the quality of the data.

Abstract Copyright:

Journal keyword(s): instrumentation: detectors - methods: laboratory: solid state - methods: observational - submillimeter: general

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4176 2
2 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1084 3
3 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 738 2
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2049 1
5 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4559 2
6 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 804 2
7 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 725 0
8 QSO J0730-116 QSO 07 30 19.11247420 -11 41 12.6005110     20.30 20.3   ~ 269 1
9 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 243 0
10 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1076 1
11 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 712 0

    Equat.    Gal    SGal    Ecl

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