| | KEKB HER(high Energy ring) operating stably by
using 8 superconducting cavities. The Maximum current
is more than 1.4 A, so the HOM(higher order mode)
power of each cavity is as high as 16 kW, and the beam
power of 400kW is handled by each cavity. To increase
beam current more than 2 A and future Super KEKB
project, HOM dampers of 3 mm thick ferrite have been
constructed to test higher absorbing power of more than
40 kW. The construction of input coupler for 500 kW
operation power is also starting with new industry TiNOx
coating. | |