The Space High-cadence Observing Telescope (SHOT) is proposed to operate at the frequency band of 1 ∼ 3 THz. It will have a wide field of view to achieve a large sky area imaging survey and gather more information about the dynamic universe. A prototype telescope with 500 mm aperture will be established and tested at the preliminary stage. The telescope adopts a dual-reflector system. Considering the lightweight design, topology optimization of three cases of reflectors with aluminum, SiC and CFRP are carried out to supply a reference of the initial structure design and material option. In the initial design, the aluminum secondary reflector is supported by a steel cylinder and connected to the support structure of the main reflector using steel tripods. The back side of the main reflector is mostly distributed with triangular holes and supported through three points. The main reflector adopts SiC. To further improve the performance, the multiple-objective size optimization is conducted according to the finite element analysis results. The total weight of the optimal structure is only 8.62 kg, 31% less than the initial design. The surface deformation rms is 2.18 μm by loading gravity and 50 K temperature difference. The stiffness of the structure is also sufficient.
Kinetic inductance detectors (KID) have great potential in astronomical observation, such as searching for exoplanets, because of their low noise, fast response and photon counting characteristics. In this paper, we present the design process and simulation results of a microstrip line coupled KIDs array for near-infrared astronomical observation. Compared with coplanar waveguide (CPW) feedlines, microstrip feedlines do not require air bridges, which simplify fabrication process. In the design part, we mainly focus on the impedance transforming networks, the KID structure, and the frequency crosstalk simulations. The test array has a total of 104 resonators with 8 rows and 13 columns, which ranges from 4.899 GHz to 6.194 GHz. The pitch size is about 200 µm and the frequency crosstalk is less than 50 kHz in simulation.
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