| Paper | Title | Page |
|---|
| TUP39 | Basic Research on the 1.3 GHZ Superconducting Cavity for the ERL Main Linacs | 219 |
| | - T. Furuya, S. Sakanaka, T. Suwada, T. Takahashi, K. Umemori
KEK - H. Sakai, K. Shinoe
ISSP - M. Sawamura
JAEA
| |
| | Feasibility study of the superconducting cavity for 1.3
GHz ERL (Energy Recovery Linac) main linacs has
started under the collaboration of KEK, JAEA and
University of Tokyo. The development effort was
concentrated to optimize the cavity shape to sufficiently
suppress the beam instabilities for the desired accelerating
beam of 100 mA with the recovery beam of 100 mA. Our
final shape has a 9-cell structure with beam pipes of a
large diameter on both sides. BBU simulation on dipole
modes showed the BBU current limit of more than 600
mA without any randomize of HOM frequencies. HOM
power absorbed by the dampers is estimated as 100 W for
monopole modes. For the damping of quadrupole modes a
new idea of mode conversion using an eccentric fluted
beam pipe (EFB) is proposed and simulated. This simple
way can take out the quadrupoles to the beam pipe easily.
For the establishment of a manufacturing process and the
performance of the cavity shape, two single cavities one
of which has the EFB have been fabricated and measured.
Shape optimizing study, fabrication and some
measurement results will be presented. | |