Research on the Processing Technology of RF Shield Bellows for High Energy Photon Source Storage Ring

The RF shield bellows of storage ring is composed of circular structure and circular main body with slit structure. For every shield finger there is a mating spring finger that exerts
$123\pm 25$
grams of contact force. The surface of SS stube and spring finger is silver plated with a thickness of
$5-10\mu m$
. The silver plated spring finger has a good self-lubricating function. The spring finger, contact finger and SS stube form a good friction structure. The internal ultra-high vacuum degree of the shield bellows is better than
$1.6\times 10^{-10}Torr$
, and the vacuum leakage rate of the weld and the shield bellows is better than
$1\times 10^{-11}\ Torr-L/s$
.