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arXiv 1008.2871astro-ph.IM
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平方公里阵列:第一阶段的概念设计

Square Kilometre Array: a concept design for Phase 1

M. A. Garrett, J. M. Cordes, D. R. Deboer, J. L. Jonas, S. Rawlings, R. T. Schilizzi

摘要:

中低频的SKA将分两个不同的阶段构建,第一阶段是第二阶段的子集。本文件定义了SKA第1阶段(SKA_1)的主要科学目标和基线技术概念。SKA_1的主要科学目标将是研究从黑暗时代到现在的宇宙中中性氢的历史和作用,并将中子星用作基础物理的探测器。SKA_1的基线技术概念将包括一个工作频率高达450 MHz的稀疏孔径阵列,以及一个天线阵列,最初工作频率高达3 GHz,但天线表面精度能够达到10 GHz。一个相关的先进仪器计划(AIP)允许进一步开发目前正在研究的新技术。建设将在2016-2019年进行,总资本成本为3.5亿\texteuro,包括应急元素。SKA_1望远镜的成本估计目前正在由SKA项目开发办公室(SPDO)牵头进行一项更详细和彻底的成本计算工作。SKA_1的3.5亿\texteuro是一个受成本限制的上限;额外的意外开支是为了缩小项目的总体范围。SKA_1的设计预计将随着主要费用估计数,特别是两个地点的基础设施费用的改进而不断发展。SKA_1设施将在灵敏度、调查速度、图像保真度、时间分辨率和视野方面向前迈进一大步。它将开辟探索空间的新领域,并展示支撑SKA第2阶段(SKA_2)的科学和技术。

英文摘要:

The SKA at mid and low frequencies will be constructed in two distinct phases, the first being a subset of the second. This document defines the main scientific goals and baseline technical concept for the SKA Phase 1 (SKA_1). The major science goals for SKA_1 will be to study the history and role of neutral Hydrogen in the Universe from the dark ages to the present-day, and to employ pulsars as probes of fundamental physics. The baseline technical concept of SKA_1 will include a sparse aperture array operating at frequencies up to 450 MHz, and an array of dishes, initially operating at frequencies up to 3 GHz but capable of 10 GHz in terms of antenna surface accuracy. An associated Advanced Instrumentation Program (AIP) allows further development of new technologies currently under investigation. Construction will take place in 2016-2019 at a total capital cost of 350M\texteuro, including an element for contingency. The cost estimates of the SKA_1 telescope are now the subject of a more detailed and thorough costing exercise led by the SKA Project Development Office (SPDO). The 350 M\texteuro total for SKA_1 is a cost-constrained cap; an additional contingency is to reduce the overall scope of the project. The design of the SKA_1 is expected to evolve as the major cost estimates are refined, in particular the infrastructure costs at the two sites. The SKA_1 facility will represent a major step forward in terms of sensitivity, survey speed, image fidelity, temporal resolution and field-of-view. It will open up new areas of discovery space and demonstrate the science and technology underpinning the SKA Phase 2 (SKA_2).

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。

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