Finite Element-Based Dark Current Modeling with the Analyst Code

New high-energy physics accelerators are very expensive to design and build; therefore, predicting and correcting potential failure mechanisms early in the design process can have a substantial impact on overall machine development costs. In particular, understanding and suppressing dark current generation is an important part of designing a variety of high field-gradient structures, including radio-frequency electron guns, slow-wave structures, and power feed systems. For example, dark current modeling is needed for the design of the Machine Protection System for International Linear Collider Main Linac. To address this need, this project will develop a first-of-its-kind design capability for use in dark current amelioration for accelerator, microwave tube, and other particle beam applications. The capability will leverage an existing capability, implemented for multipacting analysis, in a commercial finite-element analysis package. Commercial Applications and other Benefits as described by the awardee: Anticipated public benefits include lower development costs for new high-energy particle colliders and improved first-pass designs for high-power microwave tubes. These benefits would help the U. S. microwave tube industry compete in a worldwide marketplace.