The ALMA Band 9 receiver : Design, construction, characterization, and first light
The ALMA Band 9 receiver : Design, construction, characterization, and first light
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ALMA Band 9 接收器：设计、构造、特性描述和第一束光
DOI：
10.1051/0004-6361/201425529
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发表时间：
2015
影响因子：
6.5
通讯作者：
W. Wild
中科院分区：
文献类型：
--
作者：
A. Baryshev;R. Hesper;F. Mena;T. Klapwijk;T. V. Kempen;M. Hogerheijde;B. Jackson;J. Adema;G. Gerlofsma;M. Bekema;J. Barkhof;L. D. Haan;M. V. D. Bemt;A. Koops;K. Keizer;C. Pieters;J. Jagt;H. Schaeffer;T. Zijlstra;M. Kroug;C. Lodewijk;K. Wielinga;W. Boland;M. D. Graauw;E. Dishoeck;H. Jager;W. Wild
目标。我们描述的设计，施工，和频段9外差接收机（600-720 GHz）的阿塔卡马大毫米/亚毫米阵列（阿尔马）的特性。还介绍了在阿尔马试运行和科学验证阶段获得的第一个波段9的数据。方法.安装在望远镜前端的阿尔马波段9接收器单元（所谓的“墨盒”）被设计用于检测和下变频由阿尔马天线收集的光的两个正交线性偏振分量。进入前端的光线通过紧凑的反射镜排列重新聚焦，这些反射镜完全包含在墨盒内。该装置包含一个分离偏振的栅格和两个将每个产生的光束与本地振荡器信号联合收割机组合的分束器。合并后的光束被送入独立的双边带混频器，每个都有一个波纹喇叭耦合辐射的方式，通过一个波导与backshort腔到一个阻抗调谐的超导体-绝缘体-超导体（SIS）结，执行外差下变频。最后，产生的中频（IF）信号由低温和室温HEMT放大器放大，并输出到望远镜的IF后端进行进一步处理，最后进行相关处理。结果该接收机已在实验室中进行了构造和测试，它们表现出优异的性能，符合阿尔马的要求。报告了所有73个波段9接收机的性能统计数据。重要的是，两种不同的隧道势垒技术（需要不同的调谐电路）的SIS结已被使用，即传统的AlOx势垒和最近的高电流密度AlN势垒。在天空中的表征和测试的乐队9墨盒的性能使用调试数据。本文给出了作为阿尔马科学验证计划的一部分获得的低质量原双星IRAS 16293-2422的连续谱和线像。在源B附近的0：300 _0：300区域上提取的8 GHz宽带9光谱（包含100多条发射线）说明了数据的质量。
Aims. We describe the design, construction, and characterization of the Band 9 heterodyne receivers (600–720 GHz) 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. Methods. 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. Results. 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 di_erent tunnel-barrier technologies (necessitating di_erent 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 8 GHz wide Band 9 spectrum extracted over a 0:300 _0:300 region near source B, containing more than 100 emission lines, illustrates the quality of the data.