Evaluating emission characteristics of field emission cathodes over long pulse durations
POSTER
Abstract
The cathode test stand (CTS) at LANL is designed for voltages up to 500kV and utilizes a PFN which can deliver pulse durations up to 2.6 μs. We are able to measure the emission characteristics of various field emitters on the CTS over a large range of long pulse lengths. Diagnostics include cathode emission imaging, current density (J(x,y)) and emittance measurements with a scintillator coupled with a pepperpot mask and temporal characterization with B-dots and E-dots. In addition, a multi-frame camera has been employed, providing the ability to track J(x,y) on the scintillator throughout time. Here, we will show the extracted characteristics of a given cathode material for several pulse durations. In addition, we describe the correlation between the beam brightness and cathode material.
*This work was supported by the National Nuclear Security Administration of U.S. Department of Energy under contract 89233218CNA000001.This work was partially supported by the US Department of Energy, Office of Science, High Energy Physics under Cooperative Agreement award number DE-SC0018362 and Michigan State University.
Presenters
-
Madison R Howard
- Michigan State University