Fusion Message Board

In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.

Subject: Re: Diamond electron emitters (fabrication of)
Date: Jul 13, 3:21 pm
Poster: Jim Lux

On Jul 13, 3:21 pm, Jim Lux wrote:

> There is a very short article at http://www.lerc.nasa.gov/WWW/RT1995/5000/5620k.htm about CsI doped diamond material which have a secondary electron emission co-efficient of 60 as opposed to 2-4 for most materials used in these applications.

I've taken a look at a couple of the references cited in the above web page, specifically the Appl. Phys. Lett. paper from 1995 where they actually do the CsI.

The polycrystalline diamond was deposited on a Molybdenum substrate using a microwave plasma with a hot filament assist. Then, they put a very thin layer of a Metal Halid (10-100 nm) onto the diamond with vapor deposition (standard evaporation?). They make a mention of the "ease" with which CVD diamond films can be deposited (sure, with a UHV setup and a lab full of equipment?). Anyway, the reference they cite for the ease is J.D. Angus Y.Wang, and M. Sunkara, Annu. Rev. Mater. Sci. v21, p221 (1991). I'll try and find that reference