1. CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;
2. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
|95.55.Jz||Radio telescopes and instrumentation; heterodyne receivers|
|95.85.-e||Astronomical observations (additional primary heading(s) must be chosen with these entries to represent the astronomical objects and/or properties studied)|
|07.57.Kp||Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors (see also 85.60.Gz Photodetectors in electronic and magnetic devices, and 95.55.Rg Photoconductors and bolometers in astronomy)|
|07.05.Kf||Data analysis: algorithms and implementation; data management (for data analysis in nuclear physics, see 29.85.-c)|
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) was completed with its main structure installed on September 25, 2016, after which it entered the commissioning phase. This paper aims to introduce the commissioning progress of the FAST over the past two years. To improve its operational reliability and ensure effective observation time, FAST has been equipped with a real-time information system for the active reflector system and hierarchical commissioning scheme for the feed support system, which ultimately achieves safe operation of the two systems. For meeting the high-performance indices, a high-precision measurement system was set up based on the effective control methods that were implemented for the active reflector system and feed support system. Since the commissioning of the FAST, a low-frequency ultra-wideband receiver and 19-beam
the National Natural Science Foundation of China(Grant,Nos.,11673039,11573044,11673002,11803051,11503048,11203048)
the Youth Innovation Promotion Association CAS; the Open Project Program of the Key Laboratory of FAST
Chinese Academy of Sciences
the National Key Research and Development Program of China(Grant,No.2017YFA0402600)
CAS “Light of West China” Program
the Young Researcher Grant of National Astronomical Observatories
Chinese Academy of Sciences. The FAST FELLOWSHIP is supported by Special Funding for Advanced Users
budgeted and administrated by Center for Astronomical Mega-Science
Chinese Academy of Sciences(CAMS)
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11673039, 11573044, 11673002, 11803051, 11503048, and 11203048), the Youth Innovation Promotion Association CAS, the Open Project Program of the Key Laboratory of FAST, NAOC, Chinese Academy of Sciences, the National Key Research and Development Program of China (Grant No. 2017YFA0402600), the CAS “Light of West China” Program, the Young Researcher Grant of National Astronomical Observatories, Chinese Academy of Sciences. The FAST FELLOWSHIP was supported by the Special Funding for Advanced Users, budgeted and administrated by Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS).
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(Color online) Overview of the FAST telescope.
(Color online) Deformation distance analysis of spherical reflector to paraboloid. (a) Geometric optical principle of the FAST and (b) deviation from the spherical surface to paraboloid within a 300-m aperture [
(Color online) Active reflector system. (a) Ring beam and cable net model and (b) a cross node and its tie-down cable with actuator.
(Color online) Design of the feed support system of the FAST. (a) Main mechanisms of the feed support system and (b) main structure and mechanisms of the feed cabin.
(Color online) The 19-beam
(Color online) Composition of the real-time information system of the active reflector system.
(Color online) Semi-physical simulation platform of the cable-driven parallel robot.
(Color online) Semi-physical simulation model [
(Color online) Continuous trial observation of the radio source 3C286 on November 17, 2017.
(Color online) Accuracy decompositions of the FAST.
(Color online) Position distribution of the measurement foundations.
Mutual aiming technology of the total station.
(Color online) Observation control net (measurement foundation Nos. 1 to 23).
(Color online) Elevation residual error.
(Color online) Horizontal angle residual error.
(Color online) Horizontal distance residual error.
(Color online) Distribution of the total station target. (a) Distribution of the mesh node; (b) total station target on the mesh node.
Open-loop control system of the active reflector system.
(Color online) Surface error of the basic spherical surface.
(Color online) Surface errors of the four paraboloids. Surface error is RMS
Control strategy of the feed support system.
Natural frequency of the cable-driven parallel robot.
Experiment results in observation of the feed support system.
(Color online) Low-frequency, wideband receiver (Dewar and warm electronics) on the telescope feed cabin.
(Color online) QRFH of the wideband receiver on the FAST.
(Color online) Return loss of the QRFH of the FAST wideband receiver.
(Color online) Assembled FAST-CSIRO 19-beam 1.05-
(Color online) Frequency coverage of the 19-beam 1.05-
(Color online) The 19-beam backend diagram, updated from Zhu
(Color online) Temperature variation of the high-intensity noise diode measured by beam 1 of the 19-beam,
(Color online) System temperature as a function of frequency and ZA when drifting across 3C286.
(Color online) Telescope efficiency as a function of frequency and ZA when drifting across 3C286.
(Color online) System temperature as a function of frequency and ZA when tracking 3C286 and the OFF position of 3C286.
(Color online) Telescope efficiency as a function of frequency and ZA when tracking 3C286 and the OFF position of 3C286.
(Color online) Beam pattern of beam 1 at
(Color online) Beam size as a function of frequency for beams 8, 2, 1, 5, and 14 of the 19-beam receiver.
(Color online) Beam size as a function of ZA at four frequencies (1100, 1200, 1300, and
(Color online) Observation results of the pointing calibration.
Acceptance indices (commissioning indices)
Diameter of the spherical reflector
ZA up to 40° tracking
ZA up to 40° tracking
System noise temperature
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