A LabView‐based hot cathode electron source simulator with no‐boundary condition computation method

Kania, Bartosz

doi:10.1002/jnm.2174

Cited by 3 publications

(1 citation statement)

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“…, I en . The resistances r i of individual elements and the values of the intensity I ei of the emission current depend on the temperature of the individual cathode elements, which can be determined using the cathode temperature distribution [14]. The current intensity I ei is described by the Richardson-Dushmann equation: The cathode is divided into n elementary parts with the resistance values r1, r2, …, rn, which at a fixed value of the heating voltage Vh give an emission current with the intensity According to the diagram shown in Figure 1b, the intensity of the cathode current I ci flowing through the i-th element can be expressed as follows:…”

Section: Modeling Of the Emission Current-to-voltage Conversion In Th...mentioning

confidence: 99%

Conversion Method of Thermionic Emission Current to Voltage for High-Voltage Sources of Electrons

et al. 2021

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The stability of the electron thermionic emission current is one of the most important requirements for electron sources used, inter alia, in evaporators, production of rare gas excimers, and electron beam objects for high energy physics. In emission current control systems, a negative feedback signal, directly proportional to the emission current is transferred from the high-voltage anode circuit to the low-voltage cathode circuit. This technique, especially for high-voltage sources of electrons, requires the use of galvanic isolation. Alternatively, a method of converting the emission current to voltage in the cathode power supply circuit was proposed. It uses a linear cathode current intensity distribution and multiplicative-additive processing of two voltage signals, directly proportional to the values of cathode current intensity. The simulation results show that a relatively high conversion accuracy can be obtained for low values of the electron work function of the cathode material. The results of experimental tests of the dynamic parameters of the electron source and the steady-state Ie-V characteristic of the converter are presented. The implementation of the proposed Ie-V conversion method facilitates the design of the emission current controller, especially for high-voltage sources of electrons, because a negative feedback loop between the anode and cathode circuits is not required, all controller sub-components are at a common electrostatic potential.

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Section: Modeling Of the Emission Current-to-voltage Conversion In Th...mentioning

confidence: 99%

Conversion Method of Thermionic Emission Current to Voltage for High-Voltage Sources of Electrons

et al. 2021

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System identification of a hot cathode electron source: Time domain approach

Kania

Sikora

2018

AIP Advances

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Electron sources with a hot cathode operating in consumption or generation modes are widely used in many vacuum devices as gas ion sources, thermionic energy converters. The main aim of this work is to get information how dynamic properties of the electron source changes within full range of work, therefore the identification of a hot cathode electron source using the step signal and the time domain approach to know dynamic parameters (DC incremental transconductance, time constant, delay time) of the electron source in full range of its operation is made. In the first part, an open-loop system identification using step response method was conducted. For the electron source with a thoriated tungsten cathode (d=0.1 mm, l=45 mm) operating in the range 1 μA to 1 mA, the time constant T varies from 0.71 s to 0.35 s, the delay time T0 from 0.04 s to 0.01 s and the DC incremental transconductance g0 from 0 to 0.0056 S, respectively. In the next step, an approximation of obtained characteristics is made and ultimate gains of thermionic emission current automatic control system for each fixed operating point are estimated. The results of similar investigations for electron sources with an yttrium oxide coated iridium cathode and a tungsten cathode have also been shown. Presented system identification approach can be successfully applied to other types of the hot cathode electron sources.

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Thermionic emission controller with PID algorithm

Kania

Sikora

2016

2016 MIXDES - 23rd International Conference Mixed Design of Integrated Circuits and Systems

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A LabView‐based hot cathode electron source simulator with no‐boundary condition computation method

Cited by 3 publications

References 7 publications

Conversion Method of Thermionic Emission Current to Voltage for High-Voltage Sources of Electrons

Conversion Method of Thermionic Emission Current to Voltage for High-Voltage Sources of Electrons

System identification of a hot cathode electron source: Time domain approach

Thermionic emission controller with PID algorithm

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