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High-frequency Power Amplifiers for Ion-beam Accelerators.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	High-frequency Power Amplifiers for Ion-beam Accelerators./
Author:	Hou, Yuetao.
Description:	1 online resource (154 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Electrical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798382841922

High-frequency Power Amplifiers for Ion-beam Accelerators.
Hou, Yuetao.

High-frequency Power Amplifiers for Ion-beam Accelerators. - 1 online resource (154 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

Thesis (Ph.D.)--Cornell University, 2024.

Includes bibliographical references

Ion-beam accelerators have been widely used in applications such as medical therapy, ion implantation and nuclear fusion. Compact and low-cost ion-beam accelerator enables wider adoption of these technologies. Multiple-Electrostatic-Quadrupole-Array Linear Accelerator (MEQALAC) has been proposed and has the potential to make a low-cost compact tabletop particle accelerator. Such accelerator needs to be driven by high-frequency power amplifiers that generate high voltages. This thesis provides steady-state modeling, circuit architectures, design methodologies and hardware implementation of an evolution of high-frequency high-efficiency compact switch-mode power amplifiers that generate voltage at kilo-volt scale suitable for MEQALAC. First, a Class-D power amplifier with a novel capacitive shunt branch is proposed and designed which achieves 10 kV output voltage with reduced transistor current. Class-E power amplifiers are then employed for frequencies beyond 27-MHz. A widely applicable steady-state model for Class-E inverter is proposed based on the Laplace-Based Steady-State Modeling (LBSM) approach. The value of this model is demonstrated by using it to design a finite-input-inductor Class-E inverter with constant output voltage in which the input inductance is selected to resonate with the shunt capacitance enabling constant output voltage and Zero-Voltage-Switching (ZVS) for a range of loading conditions. The proposed approach results in an accurate selection of the inductance value of the input inductor. This approach to inductance value selection is much faster than but equally accurate to a simulation-based approach.Moreover, a novel optimization approach is proposed to optimize the dimensions of an aircore toroidal inductor and improve system efficiency. A toroidal inductor with an outer diameter of 8.4 cm and an operating frequency of 50 MHz optimized using this approach achieves a quality-factor of 595. To extend the thermal limit of the power amplifier and improve its reliability and operation time in vacuum, a stacked power amplifier architecture using air-core transformers is proposed to combine multiple inverters. A 27-MHz compact power amplifier is built based on the proposed architecture and design methodology. This power amplifier generates more than 6 kV output voltage from 20 V dc input voltage, featuring a voltage gain of more than 399, while operating at greater than 5% duty ratio in vacuum.Finally, a novel vertically stacked piezoelectric transformer structure with piezoelectric resonator and substrate is proposed. Two generations of prototype piezoelectric transformers are built and tested to verify the proposed structure which achieves 3 - 6 voltage gain at MHz operating frequency with less than 6mmx6mm area and up to 80V voltage rating. The piezoelectric transformers show potential to replace magnetics used in the conventional power amplifiers. Limitations of the prototype piezoelectric transformer voltage rating is discussed which leads to future work. The piezoelectric resonator used in building the piezoelectric transformers is studied in DC-DC power conversion. A merged switched-capacitor piezoelectric-resonator based DC-DC converter is proposed which achieves high efficiency across a wide range of conversion ratio.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798382841922Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

High voltageIndex Terms--Genre/Form:

554714
Electronic books.

High-frequency Power Amplifiers for Ion-beam Accelerators.
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520 $a Ion-beam accelerators have been widely used in applications such as medical therapy, ion implantation and nuclear fusion. Compact and low-cost ion-beam accelerator enables wider adoption of these technologies. Multiple-Electrostatic-Quadrupole-Array Linear Accelerator (MEQALAC) has been proposed and has the potential to make a low-cost compact tabletop particle accelerator. Such accelerator needs to be driven by high-frequency power amplifiers that generate high voltages. This thesis provides steady-state modeling, circuit architectures, design methodologies and hardware implementation of an evolution of high-frequency high-efficiency compact switch-mode power amplifiers that generate voltage at kilo-volt scale suitable for MEQALAC. First, a Class-D power amplifier with a novel capacitive shunt branch is proposed and designed which achieves 10 kV output voltage with reduced transistor current. Class-E power amplifiers are then employed for frequencies beyond 27-MHz. A widely applicable steady-state model for Class-E inverter is proposed based on the Laplace-Based Steady-State Modeling (LBSM) approach. The value of this model is demonstrated by using it to design a finite-input-inductor Class-E inverter with constant output voltage in which the input inductance is selected to resonate with the shunt capacitance enabling constant output voltage and Zero-Voltage-Switching (ZVS) for a range of loading conditions. The proposed approach results in an accurate selection of the inductance value of the input inductor. This approach to inductance value selection is much faster than but equally accurate to a simulation-based approach.Moreover, a novel optimization approach is proposed to optimize the dimensions of an aircore toroidal inductor and improve system efficiency. A toroidal inductor with an outer diameter of 8.4 cm and an operating frequency of 50 MHz optimized using this approach achieves a quality-factor of 595. To extend the thermal limit of the power amplifier and improve its reliability and operation time in vacuum, a stacked power amplifier architecture using air-core transformers is proposed to combine multiple inverters. A 27-MHz compact power amplifier is built based on the proposed architecture and design methodology. This power amplifier generates more than 6 kV output voltage from 20 V dc input voltage, featuring a voltage gain of more than 399, while operating at greater than 5% duty ratio in vacuum.Finally, a novel vertically stacked piezoelectric transformer structure with piezoelectric resonator and substrate is proposed. Two generations of prototype piezoelectric transformers are built and tested to verify the proposed structure which achieves 3 - 6 voltage gain at MHz operating frequency with less than 6mmx6mm area and up to 80V voltage rating. The piezoelectric transformers show potential to replace magnetics used in the conventional power amplifiers. Limitations of the prototype piezoelectric transformer voltage rating is discussed which leads to future work. The piezoelectric resonator used in building the piezoelectric transformers is studied in DC-DC power conversion. A merged switched-capacitor piezoelectric-resonator based DC-DC converter is proposed which achieves high efficiency across a wide range of conversion ratio.
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653 $a Power amplifiers
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