Modelling and simulation of axial-virtual cathode oscillator using matlab simulink

This thesis presents the modelling and simulation of an Axial-Virtual Cathode Oscillator (Axial-VIRCATOR), using the MATLAB Simulink software package. One dimensional model of VIRCATOR has been implemented by using mathematical model based on Child-Langmuir Law that describes the charge, charge dens...

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Main Author:	Moustafa Hussein, Ahmed Abdalla
Format:	Thesis
Language:	English
Published:	2022
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/102417/1/AhmedAbdallaMoustafaMFS2022.pdf.pdf
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spelling	my-utm-ep.1024172023-08-28T06:28:17Z Modelling and simulation of axial-virtual cathode oscillator using matlab simulink 2022 Moustafa Hussein, Ahmed Abdalla QC Physics This thesis presents the modelling and simulation of an Axial-Virtual Cathode Oscillator (Axial-VIRCATOR), using the MATLAB Simulink software package. One dimensional model of VIRCATOR has been implemented by using mathematical model based on Child-Langmuir Law that describes the charge, charge density, current, voltage, power and efficiency of the VIRCATOR as a function of its mechanical parameters. Hence, the Axial-VIRCATOR model was chosen where its mechanical parameters such as cathode radius, anode-cathode (A/K) gap and tube diameter were evaluated. In order to adjust the tuning characteristics of the VIRCATOR tube which need to achieve the optimal output microwave power, energy and efficiency, the operation's frequencies were chosen carefully to be 4.0, 6.0, 6.3 and 8.0 GHz. Thus are the most crucial of factors to be investigated in this work. Other quantities such as the beam current, beam radius, cathode radius and transparency were derived in the analytical model and found to be in agreement with the simulation results which influencing the power efficiency, such as the anodetransparency factor Ta and the dispersion factor. Analysis results showed significant improvement of the efficiency, output power and the radiated energy of microwave output which are 43.94%, 11.64 GW and 2.4 Joules (1.5x10 13 MeV) respectively. This was achieved by carefully choosing the resonance characteristics of the VIRCATOR tube especially the influence of the relativistic component in the charge density solution, which shows a close approximation to the input current closest to the relativistic beam. The results showed by the simulation were compared to an up to date experimental publications and found to be compatible. An error calculation criterion has been implemented which shows minimum error values of -0.01 dB for the input voltage of 600 kV and this was agreed with the relativistic solution considered in this work. 2022 Thesis http://eprints.utm.my/id/eprint/102417/ http://eprints.utm.my/id/eprint/102417/1/AhmedAbdallaMoustafaMFS2022.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:149138 masters Universiti Teknologi Malaysia Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Moustafa Hussein, Ahmed Abdalla Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
description	This thesis presents the modelling and simulation of an Axial-Virtual Cathode Oscillator (Axial-VIRCATOR), using the MATLAB Simulink software package. One dimensional model of VIRCATOR has been implemented by using mathematical model based on Child-Langmuir Law that describes the charge, charge density, current, voltage, power and efficiency of the VIRCATOR as a function of its mechanical parameters. Hence, the Axial-VIRCATOR model was chosen where its mechanical parameters such as cathode radius, anode-cathode (A/K) gap and tube diameter were evaluated. In order to adjust the tuning characteristics of the VIRCATOR tube which need to achieve the optimal output microwave power, energy and efficiency, the operation's frequencies were chosen carefully to be 4.0, 6.0, 6.3 and 8.0 GHz. Thus are the most crucial of factors to be investigated in this work. Other quantities such as the beam current, beam radius, cathode radius and transparency were derived in the analytical model and found to be in agreement with the simulation results which influencing the power efficiency, such as the anodetransparency factor Ta and the dispersion factor. Analysis results showed significant improvement of the efficiency, output power and the radiated energy of microwave output which are 43.94%, 11.64 GW and 2.4 Joules (1.5x10 13 MeV) respectively. This was achieved by carefully choosing the resonance characteristics of the VIRCATOR tube especially the influence of the relativistic component in the charge density solution, which shows a close approximation to the input current closest to the relativistic beam. The results showed by the simulation were compared to an up to date experimental publications and found to be compatible. An error calculation criterion has been implemented which shows minimum error values of -0.01 dB for the input voltage of 600 kV and this was agreed with the relativistic solution considered in this work.
format	Thesis
qualification_level	Master's degree
author	Moustafa Hussein, Ahmed Abdalla
author_facet	Moustafa Hussein, Ahmed Abdalla
author_sort	Moustafa Hussein, Ahmed Abdalla
title	Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
title_short	Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
title_full	Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
title_fullStr	Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
title_full_unstemmed	Modelling and simulation of axial-virtual cathode oscillator using matlab simulink
title_sort	modelling and simulation of axial-virtual cathode oscillator using matlab simulink
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Science
publishDate	2022
url	http://eprints.utm.my/id/eprint/102417/1/AhmedAbdallaMoustafaMFS2022.pdf.pdf
_version_	1776100918010314752

Modelling and simulation of axial-virtual cathode oscillator using matlab simulink

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