As the focal panel of 4000 light positioning unit base base, the shape is a ball of 1.75 m ball radius of 20 m, and 4000 axles are toward the pores of the ball. At the time of installation, the angle of the main optical axis (the focal panel center method) and the horizontal direction is 25 degrees. The optical fiber arrangement is an equilateral triangle arrangement. Preliminary board size and unit number: plate thickness: 0.12M board diameter: 1.77M unit range: 1.75M Head: 10mm total unit number: 4145 Center and Support occupation unit: 143 (Center 7 Support 136) actual installation unit : 4002 Unit diameter: 21mm unit spacing: 25.6mm fiber unit effective coverage diameter: 33mm adopts four-point support, optimal position at R0.6885M. The focal panel reserves a hole having a diameter of 58 mm, and four apertures having a diameter of 120 mm are reserved at R0.6885M. The support rod uses a 45 station.
