ALMA北美集成中心前端测试系统
ALMA North American Integration Center Front-End Test System
摘要：
阿塔卡玛大型毫米波/亚毫米波（ALMA）阵列前端（FE）系统是信号接收、转换、处理和记录的复杂链中的第一个元件。该项目将需要70个前端。前端设计用于接收10个不同频段的信号。在运营的初始阶段，天线将配备六个波段。这些是频带3（84-116 GHz）、频带4（125-163 GHz）、频带6（211-275 GHz）、频带7（275-373 GHz）、频带8（385-500 GHz）和频带9（602-720 GHz）。计划在ALMA运营的后期阶段为天线配备缺失的频段，在建设项目结束前使用几个频段5（163-211 GHz）和频段10（787-950 GHz）接收器。ALMA前端远优于任何现有的接收机系统; ALMA原型的副产品正在提高现有毫米和亚毫米观测站的灵敏度。前端单元由许多元件组成，在欧洲，北美和东亚的不同地点生产，并在几个前端集成中心（FEIC）集成，以确保及时将所有单元交付给智利。北美射电天文台（NA-FEIC）位于美国弗吉尼亚州夏洛茨维尔的国家射电天文台。本文介绍了在NA FEIC使用的测试装置的设计和性能，以检查前端的性能，集成后和装运到智利之前。
英文摘要：
The Atacama Large Millimeter/submillimeter (ALMA) Array Front End (FE) system is the first element in a complex chain of signal receiving, conversion, processing and recording. 70 Front Ends will be required for the project. The Front End is designed to receive signals in ten different frequency bands. In the initial phase of operations, the antennas will be fully equipped with six bands. These are Band 3 (84-116 GHz), Band 4 (125-163 GHz), Band 6 (211-275 GHz), Band 7 (275-373 GHz), Band 8 (385-500 GHz) and Band 9 (602-720 GHz). It is planned to equip the antennas with the missing bands at a later stage of ALMA operations, with a few Band 5 (163-211 GHz) and Band 10 (787-950 GHz) receivers in use before the end of the construction project. The ALMA Front End is far superior to any existing receiver systems; spin-offs of the ALMA prototypes are leading to improved sensitivities in existing millimeter and submillimeter observatories. The Front End units are comprised of numerous elements, produced at different locations in Europe, North America and East Asia and are integrated at several Front End integration centers (FEIC) to insure timely delivery of all the units to Chile. The North American FEIC (NA FEIC) is at the National Radio Astronomy Observatory facility in Charlottesville, Virginia, USA. This paper describes the design and performance of the test set used at the NA FEIC to check the performance of the Front Ends, following integration and prior to shipment to Chile.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
