Neutron spectrometry for plasma rotation

G. Gorini, J. Källne, L. Ballabio

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The principles of neutron spectrometry for determination of the toroidal rotation velocity (Vt) of the plasma in tokamaks are discussed. Comparison is made with photon spectroscopy which shows that neutron spectroscopy can be used as a rotation diagnostic and that its applicability depends on the availability of high neutron fluxes and the development of methods to measure the neutron energy with very high precision. It is found that neutron spectroscopy could be a feasible rotation diagnostic for burning fusion plasmas to be produced in the next generation tokamaks such as ITER. It is proposed that Vtshould be derived from the difference spectrum obtained from the simultaneous measurement of neutrons emitted tangentially in two opposite directions. The problems connected with the calibration and stability requirements on the neutron spectrometer system for Vtmeasurements are illustrated and possible technical solutions discussed. © 1997 American Institute of Physics.
Original languageEnglish
Pages (from-to)561 - 564
Number of pages4
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 1997
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Gorini, G., Källne, J., & Ballabio, L. (1997). Neutron spectrometry for plasma rotation. Review of Scientific Instruments, 68(1), 561 - 564.