Optical design of the front mirrors is shown in the upper figure, and the aberration correction system is shown in the lower figure. When compared with the upper figure in Fig. 2 of Ref. 2 , the greatest difference is that the mirrors (both the flat mirror and the aspheric mirror) are made from Zerodur and are coated with aluminum, while in the J-WOD, they are made from stainless steel and are coated with gold. Also, the primary mirror has a diameter of about 65 mm compared with the diameter of 120 mm required for the J-WOD mirror, which means that the optical system only has a total maximum diameter of 140 mm.
The MTF (upper) and the encircled energy (lower) of the designed optical system.
The designed CTF (top left) versus the measured IMD, showing the contrast at various spatial frequencies at different positions.
The FOV of the optical system in EAST, as measured by the v710.
Visible image of the plasma-wall interaction in HT-7 during a disruption event on shot #117750.
Technical specification data of the pco.dimax for application to the EAST high-speed camera system (Ref. 7 ).
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