Neutral probe beam q-profile measurements in PDX and PBX-M

Kugel, H. W.; Gammel, G. M.; Kaita, R.; Reusch, M. F.; Roberts, D. W.
August 1988
Review of Scientific Instruments;Aug1988, Vol. 59 Issue 8, p1635
Academic Journal
Using the fast ion diagnostic experiment technique, a neutral probe beam (NPB) can be aimed to inject tangent to a magnetic surface. The resultant ion orbit shifts, due to conservation of canonical toroidal angular momentum, can be measured with a multi-sight-line charge exchange analyzer to yield direct measurements of radial magnetic flux profiles, current-density profiles, the radial position of the magnetic axis, flux surface inner and outer edges, q profiles, and central-q time dependencies. An extensive error analysis was performed on previous PDX q measurements in circular plasmas and the resulting estimated contributions of various systematic effects are discussed. Preliminary results of fast ion orbit shift measurements at early times in indented PBXM plasmas are given. Methods for increasing the absolute experimental precision of similar measurements in progress on PBX-M are discussed.


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