Diagnosis of high powered pulsed plasmas for the synthesis of new materials

Summary

New high speed optical and electronic diagnostics methods will be developed to probe ultra fast plasma phenomena in promising new plasma discharges for the synthesis of metastable materials.

Supervisor(s)

Professor Marcela Bilek

Research Location

School of Physics

Program Type

Masters/PHD

Synopsis

High power pulsed magnetron sputtering (HIPPIMS) is a new method for producing a highly ionised flux of material from a solid target for coating applications. Indications are that it produces a high ionized flux (approaching that of the cathodic arc described above). The nature of the plasma produced when high power pulses are applied to a sputtering target will underpin commercial application of this source for materials synthesis and is still not understood. In this project high speed optical and electronic diagnostic tools capable of probing the rapidly changing discharge will be developed and deployed. The optical method will be high speed high dispersion optical spectroscopy involving coupling a Fizeau interferometer to a spectrograph and high speed intensified CCD camera. This will enable the analysis of line shapes associated with species in the plasma to determine their densities and velocities. Complementary information will be obtained by time and energy resolved mass spectrometry. Langmuir probes will be used to investigate the electron temperature. The ultimate aim is to understand whether the discharge is similar to a high current arc or is a new kind of glow discharge operating at a much higher current density than previously known. An arc involves a localised emission site on either the cathode or the anode whereas a glow discharge has a distributed current on the electrodes. A glow discharge is more controlled than an arc and does not produce macroparticles.The Applied and Plasma group has recently developed and commissioned a high current (1-5 kA) pulsed cathodic arc plasma source. This source is the only one of its kind and produces a much higher instantaneous ion flux than any other deposition system currently available. The range of parameters which can be accessed make it an ideal instrument for investigating the basic physics of plasma transport in magnetic and electric fields. This project will utilize high-tech plasma diagnostic equipment, such as time resolved Langmuir probes, microwave and laser interferometry and tomography, and CIS spectroscopy) developed in collaboration with the fusion research group at the ANU, Canberra, on a two million dollar ARC infrastructure grant awarded to the consortium. The questions to be investigated include the identification of instabilities associated with transport of a high density fully ionized drifting plasma in magnetic fields, the development of enhanced charged states in the rapidly expanding plasma region. Recent simulation work has predicted that the charge state distribution is coupled to the energy distribution in a specific way and we are now in a unique position to test this.
 

Additional Information

This research field is very large and rapidly evolving so there are a number of projects available for PhD, Masters and Honours students. Students involved in the work will learn how to design, build and use a range of high tech diagnostic instruments, including high resolution spectrometers, a range of interferometers, electrostatic probes and mass energy analyzers. Top up scholarships are available for students with sufficiently high grades or other relevant experience.

HDR Inherent Requirements
In addition to the academic requirements set out in the Science Postgraduate Handbook, you may be required to satisfy a number of inherent requirements to complete this degree. Example of inherent requirement may include:

- Confidential disclosure and registration of a disability that may hinder your performance in your degree;
- Confidential disclosure of a pre-existing or current medical condition that may hinder your performance in your degree (e.g. heart disease, pace-maker, significant immune suppression, diabetes, vertigo, etc.);
- Ability to perform independently and/or with minimal supervision;
- Ability to undertake certain physical tasks (e.g. heavy lifting);
- Ability to undertake observatory, sensory and communication tasks;
- Ability to spend time at remote sites (e.g. One Tree Island, Narrabri and Camden);
- Ability to work in confined spaces or at heights;
- Ability to operate heavy machinery (e.g. farming equipment);
- Hold or acquire an Australian driver’s licence;
- Hold a current scuba diving license;
- Hold a current Working with Children Check;
- Meet initial and ongoing immunisation requirements (e.g. Q-Fever, Vaccinia virus, Hepatitis, etc.)

You must consult with your nominated supervisor regarding any identified inherent requirements before completing your application.

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Keywords

physics, plasma physics, high power pulsed discharges, time resolved plasma diagnostics, electron temperature, ion energy, plasma density, novel methods for the deposition of thin films

Opportunity ID

The opportunity ID for this research opportunity is: 712

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