The new progress in injector and positron source of STCF

A proposal has been made for the construction of a new generation of high-luminosity electron-positron colliders known as the Super Tau-Charm Facility (STCF) in China. The STCF aims to achieve a luminosity exceeding [Formula: see text][Formula: see text]cm[Formula: see text][Formula: see text]s[Formula: see text] and will operate within a center-of-mass energy range of 2 to 7[Formula: see text]GeV. Given the design challenges of the STCF collider ring, swap-out injection has been proposed as an alternative method for achieving the desired luminosity. Consequently, the STCF injector will explore both off-axis injection and swap-out injection methods concurrently. This paper will detail the ongoing research progress on these two injection techniques.