Study of a laser-heated electron gun

Roy, P.K.; Moon, Ahsa; Mima, Kunioki; Nakai, S.; Fujita, Masayuki; Imasaki, K.; Yamanaka, Chiyoe; Yasuda, Eiji; Watanabe, Takeshi; Ohigashi, Nobuhisa; Okuda, Y.; Tsunawaki, Yoshiaki

doi:10.1063/1.1147577

Cited by 15 publications

(2 citation statements)

References 19 publications

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“…Це полегшує конструювання пристроїв з емітерами частинок, що знаходяться під високим потенціалом або ізольовані від індуктора герметичними оболонками. Таку ж властивість мають пристрої з лазерним нагріванням емітера [12], але вони складніші та менш універсальні.…”

Section: Iunclassified

Physical-Topological Modeling of Electronic Devices with Induction Heating of Particle Emitters

Shynkarenko

Maikut

Tsybulskyi

et al. 2022

Microsyst., Electron. & Acoust.

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The general principles of physical and topological modeling and construction of algorithms for calculations of a wide range of electronic devices with induction heating of functional elements up to temperatures at which thermoelectronic emission and/or evaporation of the working substance in the atomized state are considered. The direction of physical-topological modeling was chosen due to the possibility of detailed analysis, based on the primary principles for related physical processes in devices, taking into account the impact of physical properties of functional elements and their design and topological (i.e. geometric) parameters. Thus, the results are obtained by solving a system of fundamental equations, which usually include Newton's and Maxwell's equations, the conservation laws of particles, charge, energy and momentum, as well as material properties, boundary and initial conditions. The set of equations is determined by the number of processes that significantly affect the operation of devices. The construction of the device model is based on the consistent hierarchy of elementary physical processes with the sequential transfer of the results of calculations for lower-level models to higher-level models in the form of initial conditions. The original mathematical models of elementary processes are represented by systems of integral-differential equations with partial derivatives in continuous space and continuous time and belong to the class of distributed mathematical models. Methods for solving the system of equations are considered. On the example of a vacuum metal evaporator with induction heating for thermovacuum coating deposition, the procedure of decomposition of the general physical process in the evaporator with a concentrator as a step-down transformer is given and the hierarchy of elementary processes is clarified. Typical initial and boundary conditions for calculating related physical processes are determined. The available application computer soft packages for the calculation of physical and topological models of various induction devices are considered. In the final part of the article it is considered the structure and structure of physical-topological models of devices with induction heating of particle emitters: i) the thermoionic metal evaporator with ionization of vapor by electrons emitted by a thermocathode from an alloy with low electron output, the cathode is made in the form of an insert on the upper end of the crucible, and ii) the X-ray tube with an inductively heated thermoelectron cathode. Calculation results of the electromagnetic field and current distribution, heat exchange in vapor and electron emitters and their emission fluxes, as well as the trajectories of emitted electrons are presented. Analysis of electron trajectories allowed to optimize the topology and design of these devices.

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Section: Iunclassified

Physical-Topological Modeling of Electronic Devices with Induction Heating of Particle Emitters

Shynkarenko

Maikut

Tsybulskyi

et al. 2022

Microsyst., Electron. & Acoust.

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“…A Kimball Physics electron gun, model EGG-3101, steptuned, 0 -10 kV, 0 -10 A electron current using a LaB 6 cathode 16,17 was used. The gun has a thermal energy spread ͑⌬E͒ of ϳ4 eV with a Gaussian beam profile, and ±0.01% / h beam stability.…”

Section: A Electron Gunmentioning

confidence: 99%

Electron-beam diagnostic for space-charge measurement of an ion beam

Roy

Henestroza

et al. 2005

Review of Scientific Instruments

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A nonperturbing electron-beam diagnostic system for measuring the charge distribution of an ion beam is developed for heavy ion fusion beam physics studies. Conventional diagnostics require temporary insertion of sensors into the beam, but such diagnostics stop the beam, or significantly alter its properties. In this diagnostic a low energy, low current electron beam is swept transversely across the ion beam; the measured electron-beam deflection is used to infer the charge density profile of the ion beam. The initial application of this diagnostic is to the neutralized transport experiment (NTX), which is exploring the physics of space-charge-dominated beam focusing onto a small spot using a neutralizing plasma. Design and development of this diagnostic and performance with the NTX ion beamline is presented.

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