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Quantum Efficiency from photocathodes and Yield from diamond secondary emitters are affected by scattering during electron transport in bulk material. The emission distribution is required to predict how current density and emittance from these sources affect beam transport in Particle-in-Cell codes, particularly MICHELLE. Monte Carlo is used to augment a standard Three-Step-Model (TSM) based model...
We report progress in mounting small thin diamond sheets over holes in larger substrates in a manner that allows electron beam amplification. In addition to a physical mount, our bonding method must be compatible with the creation and maintenance of the negative electron affinity surface and operation at elevated temperatures. We use a transient liquid phase bonding method wherein the constituent...
A diamond current amplifier is being developed that can be biased to generate an internal electric field needed for high transport efficiency and emission gain. In the process, a bonded diamond structure has been successfully fabricated that provides mechanical support for the microns-thick diamond film and that allows for the use of processing techniques needed to fabricate the biased device. Emission...
We report on photoemission images from NEA diamond using sub-bandgap and near-bandgap photon energies. Emission can be stimulated with photon wavelengths as low as 365 nm, but the low-energy emission disappears after heating the diamond to 700°C, while emission stimulated with 254 and 224 nm photons remains. In both cases the emission occurs only where the concentration of bulk point defects is low...
Electron transport through thin film semiconductors is common to both the development of semiconductor photocathodes and to secondary emission electron sources. We discuss the modeling and numerical simulation of such transport in the presence of scattering and loss mechanisms, to enable predictive estimations of energy distributions, time response, and the nature of the distribution of the emitted...
Secondary-electron-emission measurements are used to examine the transport and emission characteristics of an 8.3-micron-thick diamond amplifier film. Superior transport and emission properties are confirmed for the single-crystal CVD diamond compared to previously-studied polycrystalline diamond. In particular, low-energy secondary electrons are emitted from the conduction band even after diffusing...
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