Proof of principle experiment of a fast He0 beam production for alpha particle diagnostics

A test stand of a fast neutral helium beam device has been developed for proof of principle experiments to produce a candidate beam of alpha particle diagnostics method for ITER. A fast He0 beam will be produced and its qualities will be diagnosed on the test stand. In addition, it is also important to produce an intense and stable He- beam from a negative ion source in the test stand because a fast He0 beam have to be produced from an accelerated He- beam. In this article, the method of the fast He0 beam production, and the experimental results on the einzel lens effect for He+ beam transport in the negative ion source are shown. Several experiments on the test stand, which are necessary to clarify the availability of the alpha particle diagnostics method, are described. (author)