Development of a prototype of the Tomo-e Gozen wide-field CMOS camera


The Tomo-e Gozen is an extremely wide-field optical camera for the Kiso 1.0-m Schmidt telescope. It is capable of taking consecutive frames with a field-of-view of 20 deg$^2$ and a sub-second time-resolution, which are achieved by 84 chips of 2k$\times$1k CMOS sensor. This camera adopts unconventional designs including a lightweight structure, a nonvacuumed and naturally-air cooled system, front-side-illuminated CMOS sensors with microlens arrays, a sensor alignment along a spherical focal plane of the telescope, and massive readout electronics. To develop technical components necessary for the Tomo-e Gozen and confirm a feasibility of its basic design, we have developed a prototype-model (PM) of the Tomo-e Gozen prior to the final-model (FM). The Tomo-e PM is equipped with eight chips of the CMOS sensor arranged in a line along the RA direction, covering a sky area of 2.0 deg$^2$. The maximum frame rate is 2 fps. The total data production rate is 80 MByte sec$^{-1}$ at 2 fps, corresponding to approximately 3 TByte night$^{-1}$. After laboratory testing, we have successfully obtained consecutive movie data at 2 fps with the Tomo-e PM in the first commissioning run conducted in the end of 2015.

Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy