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The separation pattern of Balmer lines measured in fast hydrogen beams in tokamaks can be used, as has recently been demonstrated on JET, for local identification of the magnetic field direction. But the technique used on JET makes use of the intensity of the multiplet components and thus relies on the availability of plasma models and effective cross sections of sufficient quality, and this makes it prone to error. In this report a method using polarisation measurements is described, which largely eliminates doubtful data. An estimate of the residual experimental error is presented.

Additional information

Authors: VOSLAMBER D, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez- Durance (FR)
Bibliographic Reference: Paper presented: Conférence sur la Physique des Plasmas et l'Optique Quantique, Garching (DE), March 12-16, 1990
Availability: Available from (1) as Paper DE 35454 ORA
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