Print Email Facebook Twitter The ITER Thomson scattering core LIDAR diagnostic Title The ITER Thomson scattering core LIDAR diagnostic Author Naylor, G.A. Scannell, R. Beurskens, M. Walsh, M.J. Pastor, I. Donné, A.J.H. Snijders, B. Biel, W. Meszaros, B. Giudicotti, L. Pasqualotto, R. Marot, L. Publication year 2012 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. Subject Physics & ElectronicsOPT - OpticsTS - Technical SciencesHigh Tech Systems & MaterialsElectronicsIndustrial InnovationOpticsPlasma diagnostics - interferometry, spectroscopy and imagingPlasma diagnostics probes To reference this document use: http://resolver.tudelft.nl/uuid:6bd52292-0656-4431-ae73-5a8c336eab3b TNO identifier 452791 ISSN 1748-0221 Source Journal of Instrumentation, 7 (3), 1-12 Article number C03043 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.