TJ-II:Magnetic surface mapping

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The fluorescent rod system used for flux surface mapping experiments at TJ-II.

After construction of TJ-II was completed, the accuracy of the magnetic field was checked by measuring the vacuum flux surface mapping and comparing to theoretical predictions. The mapping was done at a magnetic field strength of 10% of the nominal value. The detection process involved imaging [1] the spots produced by electrons, emitted from an electron gun, when these intersected an array of fluorescent rods that swept the vacuum vessel cross section. [2] The agreement was found to be good. [3]

Flux surfaces. Left column: measured. Right column: calculated. Top row: n=4, m=3. Middle row: n=8, m=5. Bottom row: n=3, m=2. [3]