The ITER Thomson scattering core LIDAR diagnostic

G.A. Naylor, R. Scannell, M. Beurskens, M.J. Walsh, I. Pastor, A.J.H. Donné, B. Snijders, W. Biel, B. Meszaros, L. Giudicotti, R. Pasqualotto, L. Marot

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Abstract

The central electron temperature and density of the ITER plasma may be determined by Thomson scattering. A LIDAR topology is proposed in order to minimize the port access required of the ITER vacuum vessel. By using a LIDAR technique, a profile of the electron temperature and density can be determined with a resolution of about 7 cm in the central region of the plasma by using a short pulse laser ( ∼ 300 ps). Requirements for advanced plasma control indicate that such measurements should be taken at a rate of 100 Hz during a plasma shot. The limited collection cone angle possible on the ITER reactor implies the use of a high pulse energy laser ( ∼ 5 J at 1 μm). The combination of very high average power and peak power required represents a serious challenge for current laser technology. Schemes able to provide this level of laser performance will be presented along with efficient and cost effective methods of maximizing the collected light while minimizing the collection of background light by the use of an axicon element. © 2012 IOP Publishing Ltd and Sissa Medialab srl.
Original languageEnglish
Article numberC03043
Pages (from-to)-
JournalJournal of Instrumentation
Volume7
Issue number3
DOIs
Publication statusPublished - Mar 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Mathematical Physics

Cite this

Naylor, G. A., Scannell, R., Beurskens, M., Walsh, M. J., Pastor, I., Donné, A. J. H., ... Marot, L. (2012). The ITER Thomson scattering core LIDAR diagnostic. Journal of Instrumentation, 7(3), -. [C03043]. https://doi.org/10.1088/1748-0221/7/03/C03043