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Fusion Products Measurements


Fusion Products Measurements and Elementary Atomic Process Studies.

Tech Area / Field

  • FUS-OTH/Other/Fusion

8 Project completed

Registration date

Completion date

Senior Project Manager
Tocheny L V

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

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov


  • JAERI / Naka Fusion Research Establishment, Japan, Naka

Project summary

A.F.Ioffe Physico-Technical Institute, St.-Petersburg, Russia, Head of loffe Institute - academician Zh.Alferov, Institution project leader - prof.V.Afrosimov; Russian Research Institute of Experimental Physics, Arsarnas-16, Russia, Head of Institute - prof. V.Belugin, Institution project leader - A.Bessarab.

As a result of fusion reactions in deuterium-tritium plasma fast a-particles with the energy about 1 MeV/nucleon are formed. It is obvious that to provide sufficiently high fusion reaction rate is possible only by having corresponding amount of fast hydrogen ions in plasma. Therefore it is of a great importance to elucidate the mechanism of energy transfer from fusion products to plasma particles and as a result of this transfer the bulk plasma heating which determines the possibility to achieve self supported plasma burning.

The main diagnostics of a-particles which are being developed now are based on the analysis of the fluxes of helium atoms or of He-ion radiation emitted by plasma and arising from the processes of two- and one-electron capture by a-particles, correspondingly. Besides there is developing a new diagnostics of plasma current density profile which enables to measure the so-called q-factor and is important for the regime control of Tokamah plasma devices. This diagnostics needs data on the cross sections of dissociation and kinematics of appearing fragments at collisions of fast hydrogen molecules with plasma particles. Proposal for q-measurement on JT-60 by active neutral particle diagnostics will be prepared including a specification of the diagnostic equipment needed as well as expected spatial and time resolution and accuracy of the measurements.

The installations available at atomic collision physics and cyclotron laboratories of the loffe Institute enable to get practically all the data needed for the functioning of abovementioned diagnostics.

These facilities can produce also beams of fast hydrogen and helium atoms with exactly known intensity and energy for the calibration of neutral particle analyzers.

In the frame of this project the measurement can be fulfilled including one electron capture by a-particles with 0.1-1 MeV/nucleon energy into 2p- and 2s-states of formed He ion as well as registration of He 304A line intensity applied to charge exchange radiation diagnostics of a-particles. The cross-section of one- and two- electron capture and loss at collisions of helium particles with different atoms also will be measured. The calculations of two electron capture by a-particles from plasma impurity ions are planned with the use of many electron wave functions and for the energy region up to 10 keV/nucleon where quasimolecular model of interaction is valid.

Thus, the necessary supplements are planned to the data base required for the analysis plasma heating by charged fusion products and for those plasma diagnostics which are founded on the elementary processes of interaction between particles.

Total person-months of effort weapons scientists - 97.5 months. Total project coast - $ 90 000.


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