caa a22 4500 477123120 CHVBK 20180405111642.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1007/BF02677894 doi (NATIONALLICENCE)springer-10.1007/BF02677894 Use of the BFCPIC and BFCRAY codes to describe space charge limited emission in electron guns for gyrotrons [Elektronische Daten] [E. Borie, S. Illy, T. Westermann] Numerical modelling of an electron gun in the space charge limited regime requires determining the current density distribution as well as the electric fields and electron trajectories. This is a rather complicated self-consistent problem, since the space charge influences the electric field, which in turn influences the electron trajectories. Previous simulations of magnetron electron guns using the BFCPIC and BFCRAY codes used a simple emission model (constant current density) that is approximately valid for thermionic emission. The code has been modified to include space charge limited emission. Several different ways of doing this are considered. One of the models considered uses Gauss's law to force the electric field on the emitter to vanish; it was used in the original version of BFCPIC for the simulation of ion diodes. A second is based on the use of Child's law (locally), which may be more appropriate for extension to fully electromagnetic particle-in-cell (PIC) codes. Calculations were performed with both models, and the results compared with each other and with experiments performed at FZK. Plenum Publishing Corporation, 1997 Borie E. Forschungszentrum Karlsruhe, ITP, Association EURATOM-FZK, P.O. Box 3640, D-76021, Karlsruhe, Germany aut Illy S. Forschungszentrum Karlsruhe, ITP, Association EURATOM-FZK, P.O. Box 3640, D-76021, Karlsruhe, Germany aut Westermann T. Fachhochschule Karlsruhe, P.O. Box 2440, D-76012, Karlsruhe, Germany aut International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 1-22 0195-9271 18:1<1 1997 18 10762 https://doi.org/10.1007/BF02677894 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02677894 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Borie E. Forschungszentrum Karlsruhe, ITP, Association EURATOM-FZK, P.O. Box 3640, D-76021, Karlsruhe, Germany aut NATIONALLICENCE 700 1- Illy S. Forschungszentrum Karlsruhe, ITP, Association EURATOM-FZK, P.O. Box 3640, D-76021, Karlsruhe, Germany aut NATIONALLICENCE 700 1- Westermann T. Fachhochschule Karlsruhe, P.O. Box 2440, D-76012, Karlsruhe, Germany aut NATIONALLICENCE 773 0- International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 1-22 0195-9271 18:1<1 1997 18 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer