Engineering meta-materials and material structures for high power RF devices
Abstract
Transition metal oxides with high work function and opto-electronic properties are of utmost interest in several advanced applications, such as photonics and thermochromic as well as protective coatings. RF cavities are crucial elements of any accelerator. Energy compensation, acceleration and bunching are just a few of the many tasks that are played by RF devices in the accelerators- linear or circular. However, RF cavities are affected by many issues, e.g., instabilities or high gradients. Degassing is another challenging issue that may induce arc discharges, degradation of vacuum condition and, as a consequence, lowering of the cavity performance. Furthermore, the surface roughness of these structures may generate electric charges and a locally confined E field that may induce discharge phenomena. The latter also depends on the work function (WF) of the metallic element used in the device. On the other hand, the field emission (FE) of electrons under high electric fields from the skin depth of the metallic body of RF devices, not only provokes further discharging and surface damage to a cavity, but also reduces the accelerator performances. The proposed projects will systematically approach discussed issues, exploiting the construction of meta-heterojunctions using high work function metal oxides in junction with the metallic elements in order to improve the performance of the device. The main focus of the project will be on the investigation of engineered heterostructures and characterization of high WF materials and engineering of high conductivity devices; Surface roughness reduction; Grain boundary modification and percolation phenomena and field-secondary electron emission mitigation.This project is an interdisciplinary project between two main interests of the U.S. air force and space force, including the Aerospace composite materials and Aerospace materials for extreme conditions. The results of this project will deepen the understanding of the interface dynamics of the innovative meta structures as well as their fundamental properties under extreme conditions. The information can be exploited in the satellite technologies as well as novel superior structures with multifunctional performances.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 22, 2024
- Source ID
- FA86552317004
Entities
People
- Javad Rezvani
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Camerino