Reflectometry techniques for density profile measurements on fusion plasmas
Reflectometry applied to the measurement of density profiles on fusion plasmas has been subject to many recent developments. After a brief reminder of the principles of reflectometry, the theoretical accuracy of reflectometry measurements is discussed. The main difficulties limiting the performance, namely the plasma fluctuations and the quality of the transmission lines, are analysed. The different techniques used for reflectometry are then presented grouped into three different categories, depending on the frequency spectrum of the probing wave: single frequency, few discrete frequencies, or broad spectrum. The present status and achievements of actual implementations of these techniques are shown, with an analysis of their respective limitations and merits, as well as foreseen developments. A discussion of the various reflectometry techniques is made, in particular for their ability to cope with plasma fluctuations and complex transmission lines, in view of the application to next step machines and very severe environments.
Bibliographic Reference: Report: EUR-CEA-FC-1568 EN (1996) 37pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
Record Number: 199610882 / Last updated on: 1996-09-16
Original language: en
Available languages: en