Use this URL to cite or link to this record in EThOS:
Title: Optical measurements on a stabilised linear pinched discharge
Author: Hall, Thomas Anthony
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1968
Availability of Full Text:
Access from EThOS:
Access from Institution:
In this thesis we discuss a new method for measuring magnetic field in a plasma, using the Zeeman effect on the spectral emission lines. An analysis of the instrument is given, and some results, obtained with it, are presented. These results were obtained on a Bz stabilised linear pinched discharge and they show that, under certain conditions, appreciable field compression is experienced. The accuracy of these results is discussed and a comparison is made with those taken with a conventional magnetic probe. These show good agreement with the Zeeman effect instrument. The second part of this thesis presents a method for obtaining time resolved electron density distributions. A Mach-Zehnder interferometer is used for this purpose, in conjunction with a ruby laser light source and the construction of these are described. Results obtained with this apparatus are presented for the same conditions used in the first part and a definite correlation is established between the two sets of results. A simple model of the Bz stabilized pinch is proposed, in which it is attempted to explain these two sets of experimental 2 3 results. The snowplough model of the unstabilised linear pinch is used as a basis for this model and some further assumptions are made to take account of the stabilising field. The experimental results, on the whole, tend to give higher values of compression than this model predicts. However, a modification to the simple snowplough model reduces this discrepancy considerably. In conclusion, suggestions are made that would explain the remaining difference.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available