The Miyun 50m radio telescope and possible upgrading project Jin Chengjin & Zhang Juyong Miyun Radio Astronomy Group, NAOC 2003, 11, 03 Contents: Brief history of the Miyun 50m project The current status The possible upgrading plan Brief history: • The Miyun Station was founded in 1960s. • The MSRT and the Miyun 15m telescope Scientific motives for building a new 50m radio telescope: • Long-time monitoring of pulsars • Gravitational wave detection • IPS observations • A VLBI unit The conceptual design in the beginning (~2001,11): • L-band telescope • Metal mesh • Light weight Some improvement afterwards (~2002,3): Chinese Lunar project • S/X band • Metal plate + mesh • Much stronger The status: • The contract was signed in Oct, 2002. • The technical design has been finished. • In parallel, we have organized several technical reviews for the antenna design. • The prospection was completed. • The antenna is schedueled to be completed in the first half of 2005. The technical review meetings: • Reviewed by domestic experts (2002, 4) • Reviewed by experts from Germany, the UK and Australia (2002, 6) • Reviewed by structure engineer from NRAO (2003,2) Constructive comments & suggestions The 15-m Radio Telescope This telescope was built in 1992. The first pulsar observation was performed with this 15- m telescope. The prospecting apparatus(2003, 7): 50m Telescope Design Specifications: Dish diameter ： 50 m Mounting ： Altitude-Azimuth Surface ： metal plate + metal mesh Metal plate : inner 30m Wire mesh : outer part RMS surface accuracy ： 1.0mm (inner 30m) 3mm (outer part) Short wavelength limit ： 2.0cm(15 GHz) (inner 30m) Pointing accuracy ： 19 arcsec Slew rates (elevation) ： 0.5 degree per second Slew rates (azimuth) ： 1.0 degree per second Optics ： Prime focus f/D = 0.35 Possible upgrading plan: • The reflecting surface • The pointing accuracy • The optics Goal: up to 43GHz The reflecting surface • Active surface The pointing accuracy: • Pointing model & A new servo system The optics: • Secondary focus • Enough space and weight load The upgrading plan: • A doctor student is working on this project.
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