PPPS 2019

1P10 - Unification of thermionic, field and space charge limited emission

24 Jun 2019, 13:00

1h 30m

Universal Center

Poster 1.1 Basic Phenomena; Posters Fundamental Research and Basic Processes and Power Electronics

Speaker

Ms Sarah Lang (Purdue University)

Description

A recent theoretical study unified field emission modeled by Fowler-Nordheim (FN) and space charge limited emissions (SCLE) with and without collisions modeled by Mott-Gurney (MG) and Child-Langmuir (CL), respectively [1]. This study showed the existence of a triple point, where the three asymptotic solutions matched, and the ubiquitous nature of CL at high voltages, even at high pressure [1]. Theoretical work has also connected FN to thermionic emission modeled by the Richardson-Laue-Dushman (RLD) equation using a general thermal-field emission (GTFE) equation [2]. This presentation explores the potential connection of the GTFE with SCLE, particularly the existence of the triple point as GTFE approaches FN. Experimental implications will be discussed.

Work supported by a Purdue Doctoral Fellowship and the Air Force Office of Scientific Research under award number FA9550-18-1-0218.

1. A. M. Darr, A. M. Loveless, and A. L. Garner, “Unification of field emission and space charge limited emission with collisions,” Appl. Phys. Lett., vol. 114, no. 1, 2019, Art. no. 014103.
2. K. L. Jensen, “A tutorial on electron sources,” IEEE Trans. Plasma Sci., vol. 46, no. 6, pp. 1881-1899, 2018.