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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:.
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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.
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.