Posted on 17 September 2018
Tim’s work showed that the more intense spectral lines emitted from a 20 cm long capillary plasma have intensities approaching that of a black-body and hence can be used for temperature measurements of the plasma. The capillary plasma source was bought using funds provided by the University of York Research Priming Fund in 2015 and is mainly being used to produce laser output in the extreme ultra-violet. The laser is sited in the York Plasma Institute laboratory building. Working alongside PhD student Sarah Wilson with help from PhD student Joe Branson, Tim collected and analysed spectra emitted from the plasma used to create the laser output from the capillary. He showed that the Rayleigh-Jeans form of black-body emission provided an upper limit to some observed spectral line intensities. It is well known that black-body emission varies with the temperature of the emitter, but laboratory plasmas are usually not sufficiently large enough or dense enough for the emission to be black-body. The project was supervised by Professor Greg Tallents who commented: ‘It is particularly gratifying for an undergraduate project to result in work suitable for publication. Tim Page in collaboration with my PhD student Sarah Wilson and PhD student Joe Branson, who is supervised by Erik Wagenaars, successfully analysed the spectra from the capillary laser. By making a comparison to other temperature measurement techniques, Tim demonstrated that the black-body method of temperature determination was viable for the long and dense capillary plasma.’
More details of the temperature measurement are available in the publication:
T. Page, S. A. Wilson, J. Branson, E. Wagenaars and G. J. Tallents 2018 J. Quantitative Spectroscopy and Radiative Transfer DOI: 10.1016/j.jqsrt.2018.09.005.