End-to-end analysis using MICHELLE and TESLA codes

The 2.5D large-signal code TESLA is capable of accurate and efficient modeling of linear-beam vacuum electronic amplifiers, such as klystrons and multiple-beam klystrons (MBKs), extended interaction klystrons (EIKs), inductive output tubes (IOTs) and coupled cavity traveling-wave tubes (CC-TWTs). The demanding computational accuracy in the designs of modern vacuum amplifiers requires a monolithic approach in the modeling of the entire device, so called "end-to-end analysis". In this work we will report a new approach to perform such analysis. This approach is based on using the gun-collector code MICHELLE and the latest version of the code TESLA. We added in TESLA the capability to import and process detailed electron beam distributions given by the gun-code MICHELLE. The given initial distribution of particles can be de-populated to keep their total number reasonably low to take advantage of the performance advantages of the TESLA model. After the TESLA large-signal simulation, the spent-beam information can be exported back into MICHELLE to perform the collector simulation. To support currently available time-dependent simulations by MICHELLE we are working to include in TESLA the time-dependent electron beam data processing as well. We will show TESLA simulations of a few different devices with electron beam distributions imported from the gun-code.