Progress report on CHICO-X upgrade

CHICO-X upgrade project was approved by DOE/NP in FY17 and is funded over a three-year period beginning in FY18. The first-year effort focuses on the redesign of detector chamber and pixelated position-sensing board, to be fully integrated into GRETA. The preliminary design will be completed by the end of FY18 and the final design will be achieved after checking the compatibility with the GRETA mounting frame. The major changes include the sliding O-ring seal for the pressure window and the integrated design for detector chamber. The extra space freed from the reconfigured pixelated position-sensing board, which has a shorter coverage of scattering angle, allows a more solid contact between the anode and the transmission line by modifying the pressing mechanism. Some detailed design will be presented.