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New Approach to Laser Diagnostics

#0172


New Approach to Laser Diagnostics (LIDAR and LII techniques).

Tech Area / Field

  • INS-MEA/Measuring Instruments/Instrumentation

Status
8 Project completed

Registration date
27.02.1994

Completion date
21.06.1999

Senior Project Manager
Lapidus O V

Leading Institute
Russian Academy of Sciences / Physical Technical Institute, Russia, St Petersburg

Supporting institutes

  • BIFO Ltd, Russia, Moscow\nVNIIEF, Russia, N. Novgorod reg., Sarov\nVavilov State Optical Institute (GOI), Russia, St Petersburg

Collaborators

  • Universität Stuttgart / Institut für Plasmaforschung, Germany, Stuttgart\nJAERI / Naka Fusion Research Establishment, Japan, Naka\nJoint European Torus (JET) / Joint Undertaking, UK, Abingdon

Project summary

Two fundamental methods of plasma study by Thomson scattering and laser induced fluorescence are to be revised and developed in the frame of present project in order to expand the area of diagnostics application.

The advanced Thomson scattering diagnostics has been developed in the Ioffe Institute. The new scheme was based on the laser multipass plasma probing in order to increase considerably the scattered radiation at the same laser output.

The diagnostic equipment pieces appropriate for high spatial and spectral resolution LIDAR experiments were designed.

We have also developed a new diagnostic approach alternative to LIF (laser induced fluorescence). This method is based on a laser induced ionization (LII) of the upper atomic states. The ramp down of spontaneous emission from the corresponding upper levels, i.e. the burning out signal, was used to determine the current state of hydrogen atomic level populations in plasma. The first experiments carried out in FT-1 tokamak proved this imethod to be promising in fusion and plasma processing experiments.

A scope of researches is to be conducted at Ioffe Institute in collaboration with Institute of Experimental Physics (Arzamas) Research Institute of Laser Physics ("Vavilov State Optical Institute", St.Petersburg) and BIFO LID Company (Moscow) to upgrade the respective diagnostic systems. New technologies and solutions concerning probe lasers, streak camera and grating polychromators are to be delivered. The project successful development relies on the experience and leading role of the listed institutions in the involved subsystems production. The project makes possible to draw the scientists and engineers, formerly engaged in building of special-purpose laser installations, into peaceful alternative activity on the problem of Nuclear Fusion.


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