Multipactor Suppression In Dielectric Loaded Accelerating Structures Using Vacuum Channel Surface Modification

Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology. We propose a research program to study the methods for suppressing it that includes exploration of different geometrical modifications with combination of thin film coating of a low multipactoring material on the dielectric surface. Six X-band dielectric test structures will be built, instrumented, and cold tested preparatory to high power measurements in Phase II. The overall objective for the proposed Phase I program is the evaluation, design, and fabrication of DLA test structures for the high power multipactor experiments to be performed. We plan to study new multipactor suppression techniques that work by spoiling the resonance condition. Phase I will culminate in low power bench measurements of the test DLA structures. Applications and benefits: Eliminating multipactor effects in dielectric accelerators will allow higher power and higher efficiency operation of these machines