Development of ALMA Band 4 (125-163 GHz) receiver
Development of ALMA Band 4 (125-163 GHz) receiver
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DOI：
10.1093/pasj/psu026
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发表时间：
2014-06-01
影响因子：
2.3
通讯作者：
Uzawa, Yoshinori
中科院分区：
文献类型：
--
作者：
Asayama, Shin'ichiro;Takahashi, Toshikazu;Uzawa, Yoshinori
我们研制了一种用于阿塔卡马大毫米/亚毫米阵列(ALMA)4波段的双极化接收机。覆盖125到163 GHz频谱窗口的频段4是构成ALMA前端的十个频段之一。频带4接收器由三个元件组成：热光学元件、冷盒组件和热盒组件。冷盒包括馈电喇叭、正交模换能器、边带分离(2Sb)超导体-绝缘体-超导体混频器、冷中频(IF)放大器、IF隔离器、偏置保护电路板和组件互连。中频带宽为4-8 GHz。作为试生产模型制造的第一批8个接收器在严格的ALMA要求下表现出了优异的性能。在对安装在ALMA天线上的4波段接收机进行的现场性能测试中，成功地获得了稳定的天文条纹和闭合相位。我们建立良好的频带4接收器将有助于天文学研究的各个领域，如高红移星系的探测，正常场星系中冷分子介质的表征，以及天体化学，包括氚物种的观测。
We have developed a dual-polarization receiver for Band 4 of the Atacama Large Millimeter/submillimeter Array (ALMA). Band 4, which covers the 125 to 163 GHz spectral window, is one of the ten bands that form the ALMA Front End. The Band 4 receiver consists of three elements: a warm optics, a cold cartridge assembly, and a warm cartridge assembly. The cold cartridge includes a feed horn, an orthomode transducer, sideband-separating (2SB) superconductor-insulator-superconductor mixers, cold intermediate frequency (IF) amplifiers, IF isolators, bias-protection circuit boards, and component interconnections. The IF bandwidth is 4-8 GHz. The first eight receivers manufactured as preproduction models have demonstrated excellent performance within the stringent ALMA requirements. Stable astronomical fringes and closure phase have been successfully achieved during field performance tests of the Band 4 receivers installed in the ALMA antennas. Our well-established Band 4 receivers will contribute to various fields of astronomical research, such as the detection of high-redshift galaxies, characterization of cold molecular medium in normal field galaxies, and astrochemistry including observations of deuterated species.