Abstract

The new design of the CTF3 mid-linac PETS, capable to produce 150 MW rf power, will be presented. The recent development of the CLIC HDS and better understanding of the rf power limitations certainly require a revision of the CLIC PETS design. The evaluation and current status of the new CLIC PETS will be discussed.

Igor presented the new tapered, damped design for the CTF3 mid-linac PETS that is build from 4 quadrants. The CATIA design was checked with HFSS at different stages. A new tank will be build to replace the present one, alignment features will have to be included for proper positioning of the PETS.
It could possibly be ready for installation during the 2006/07 shutdown.

The layout of the CLIC PETS has changed considerably since the new HDS structure is shorter (96 vs 243mm). The new PETS has a reduced a/λ , 245mm active length and will generate 360MW for <170A drive beam current. The phase advance was optimized for HOM damping and is 72°/cell. The power extractor is much shorter (~15mm) and they are included in the mechanical block for two PETS that are build in one common piece. The matching section design is ongoing. The PETS active length is just big enough for the ON/OFF mechanism, actuators with pressurized air have been tested to allow a movement of the tuning wedges in 15ms.
The new design can be adapted with a modified length for the PETS to be used in CLEX.