Conveners
2.5 Codes and Modeling and 2.8 THz Sources, Radiation, and Applications
- Ian Rittersdorf
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Sergey Averkin (Tech-X Corporation)27/06/2019, 13:302.5 Codes and ModelingOral
Global models have become a popular tool for estimating volume-averaged plasma parameters such as number densities of plasma components, or electron temperature in partially-ionized plasmas of practical interest (with possibly thousands of chemical species and hundreds of thousands of chemical reaction paths in the discharge). Due to the usage of a volume-averaged approximation, global models...
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Mr Matthew Abide (Texas Tech University)27/06/2019, 13:452.5 Codes and ModelingOral
The development of a low-impedance magnetically insulated line oscillator (MILO) driven by a compact Marx generator developed by Texas Tech University is discussed. The goals of the project aim to develop a MILO operating within the S-Band that can provide an RF peak output power of greater than 1 GW with greater than 10% efficiency. The device design followed a set of base design equations...
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John Petillo (Leidos)27/06/2019, 14:002.5 Codes and ModelingOral
The Miram curve for a specific cathode surface describes the normalized current density as a function of cathode temperature. Understanding and predicting this curve is key to understand the performance vs. lifetime of many electrons gun sources [1]. As the cathode lifetime decreases rapidly with increased operating temperature, in many practical devices, the electron gun is operated just...
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John Petillo (Leidos)27/06/2019, 14:152.5 Codes and ModelingOral
The surfaces of electron sources exhibit non-planar features (intentional ordered arrays here but the methods apply also random surface roughness), the dimensions of which are typically microscale and therefore much smaller than the active emission area [1, 2, 3]: because emission area is already small by comparison to device dimensions, such differences in magnitude are a challenge to beam...
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Julian Picard (Massachusetts Institute of Technology)27/06/2019, 14:302.8 THz Sources, Radiation & ApplicationsOral
This work presents a laser-driven semiconductor switch (LDSS) employing silicon (Si) and gallium arsenide (GaAs) wafers that has been used to produce nanosecond-scale pulses from a 3 μs, 110 GHz gyrotron at the megawatt power level. Photoconductivity was induced in the wafers using a 532 nm Nd:YAG laser, which produces 6 ns, 230 mJ pulses. Irradiation of a single Si wafer by the laser produced...
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Prof. Sergey Baryshev (Department of Electrical and Computer Engineering, Michigan State University)27/06/2019, 14:452.8 THz Sources, Radiation & ApplicationsOral
High peak power tunable THz sources are enabling tools for medicine and materials science, non-destructive evaluation, space exploration. There is a special class of military and defense applications that includes THz communication, atmosphere monitoring, stand-off weapon and contraband detection, crowd screening. All applications require highest possible power to increase the detection...
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Mohamed Othman (SLAC National Accelerator Laboratory)27/06/2019, 15:002.8 THz Sources, Radiation & ApplicationsOral
Probing structural dynamics at atomic spatial and ultrashort temporal scales reveals unprecedented details of nature’s fundamental behavior, allowing for better understanding of intricate energy-matter interaction occurring at such scales. Ultrafast electron diffraction (UED), is the ideal choice to capture information from atomic-scale initiated by a pump laser and probed by MeV electrons....
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Prof. Sergiy Cherenshchykov27/06/2019, 15:152.8 THz Sources, Radiation & ApplicationsEither
Increasing of electron beam current density is important problem in development of a THz generator. Howeever a conventional thermionic cathode have limited current density. Experiments with magnetron gun with transaction on plasma mode are described. The gun has a metall cathode with a diameter of 6 mm and a length nearly 70 mm. The cathode was coaxially mounted inside a stainless tube with a...
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