T.W. Hartquist - Böcker

The reader has been introduced to a number of topics, taken from Toka- mak research, in order to trace the the development of applications of spec- troscopy in controlled fusion research over the last 35 years, from the early toroidal devices like ZETA to present-day Tokamaks. The subject of plasma spectroscopy has grown in sophistication in terms of the expansion of the atomic processes which have to be considered and their associated data base, the complexity of the experimental techniques and the wide range of diag- nostic applications. Plasma spectroscopy has increased our appreciation of the subtle role of impurities in determining much of the plasma behaviour. Control of impurities, by techniques such as wall conditioning, magnetic divertors, pellet or atomic beam injection and radiation mantles, offers a wealth of future investigations. Acknowledgements The author would like to acknowledge the help and inspiration he has derived from his students past and present in writing this article. In particular he is indebted toM O'Mullane for his technical help in preparing the manuscript and whose research work is featured in the sections on MARFEs and ion transport.References Abbey, A. F., Barnsley, R., Dunn, J., Lea, S. N. and Peacock, N.J.: 1993, UVand X-ray Spectroscopy of Laboratory and Astrophysical Plasmas. (editors, E Silver and S. Khan) Cambridge University Press, 493. Afrosimov, V. V., Gordeev, Y.S. et al.: 1979, J.E. T.P. Lett. 28, 501. Alper, B.: 1995, p.r.ivate communication, JET.

John Dyson has contributed to the study of the hydrodynamic processes that govern a wide variety of astrophysical sources which he has helped explain. In this volume dedicated to him, introductory reviews to a number of the key processes and to the sources themselves are given by leading experts. The mechanisms in which the multi-component natures of media affect their dynamics receive particular attention, but the roles of hydromagnetic effects are also highlighted. The importance of cosmic ray moderation and mass transfer between different thermal phases for cosmic ray moderation and mass transfer between different thermal phases for the evolution of flows are amongst the topics treated. The main types of regions considered include those where stars form, the circumstellar environments of evolved stars, the larger scale interstellar structures caused by the mass loss of stars, and those where the lines of AGNs form.The reviews complement one another and together provide a coherent introduction to the astrophysics of diffuse sources suitable for postgraduate students and researchers in astrophysics. Individual reviews stand alone and are suitable for an audience that includes advanced undergraduates doing final year projects.

The reader has been introduced to a number of topics, taken from Toka- mak research, in order to trace the the development of applications of spec- troscopy in controlled fusion research over the last 35 years, from the early toroidal devices like ZETA to present-day Tokamaks. The subject of plasma spectroscopy has grown in sophistication in terms of the expansion of the atomic processes which have to be considered and their associated data base, the complexity of the experimental techniques and the wide range of diag- nostic applications. Plasma spectroscopy has increased our appreciation of the subtle role of impurities in determining much of the plasma behaviour. Control of impurities, by techniques such as wall conditioning, magnetic divertors, pellet or atomic beam injection and radiation mantles, offers a wealth of future investigations. Acknowledgements The author would like to acknowledge the help and inspiration he has derived from his students past and present in writing this article. In particular he is indebted toM O'Mullane for his technical help in preparing the manuscript and whose research work is featured in the sections on MARFEs and ion transport.References Abbey, A. F., Barnsley, R., Dunn, J., Lea, S. N. and Peacock, N.J.: 1993, UVand X-ray Spectroscopy of Laboratory and Astrophysical Plasmas. (editors, E Silver and S. Khan) Cambridge University Press, 493. Afrosimov, V. V., Gordeev, Y.S. et al.: 1979, J.E. T.P. Lett. 28, 501. Alper, B.: 1995, p.r.ivate communication, JET.