Title :
High power coupler issues in normal conducting and superconducting accelerator applications
Author_Institution :
KEK, Tsukuba, Japan
Abstract :
The ceramic material (Al2O3) commonly used for the klystron output coupler in normal conducting, and for an input coupler to superconducting cavities is one of the most troublesome parts in accelerator applications. But the performance can be improved very much by starting with high purity (>99.9%) alumina powder of controlled grain-size (0.1~0.5-μm), and reducing the magnesium (Mg) sintering-binder to lower the dielectric loss to the order of 10-4 at S-band frequencies. It has been confirmed that the new ceramic can stand a peak S-band frequency RF power of up to 300 MW and 2.5 μsec pulse width
Keywords :
accelerator RF systems; accelerator cavities; alumina; klystrons; Al2O3; Mg; S-band frequencies; ceramic material; dielectric loss; input coupler; klystron output coupler; normal conducting accelerator applications; peak S-band frequency RF power; sintering-binder; superconducting accelerator applications; Ceramics; Conducting materials; Dielectric losses; Klystrons; Magnesium; Performance loss; Powders; Radio frequency; Space vector pulse width modulation; Superconducting materials;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795753
