The drift chamber project for the Super Charm-Tau Factory detector

The Budker Institute of Nuclear Physics is actively developing a drift chamber project with a small hexagonal cell for the Super Charm-Tau Factory. A Monte-Carlo simulation of pions flight through detector has been done to estimate the drift chamber momentum resolution. To evaluate the spatial resolution of the drift chamber a small prototype has been developed. The spatial resolution measurements have been performed using cosmic particles. This experiment is carried out for $𝐻𝑒/𝐶_3𝐻_8$ $(60/40)$ and $𝐻𝑒/𝐶_2𝐻_6$ $(50/50)$ gas mixtures at different gas gains. The obtained average spatial resolution for both mixtures is less than 100 $\mu$m for gains greater than $5 · 10^4$.