A STUDY FOR THE INSTALLATION OF THE TEXT HEAVY-ION BEAM PROBE ON DIII-D

An assessment of the feasibility of installing the TEXT 2 MeV heavy-io n beam probe on the DIII-D tokamak has been completed. Detailed drawin gs of the machine cross section were imported into the CAD application AutoCAD. A set of programs written in AutoLisp were used to generate trajectories. Displays of the accessible cross section of the plasma, scan Lines for the entire range of primary beam energy and injection a ngle ranges, and sample-volume dimensions can be rapidly generated. Be cause of the large deflection between the primary input beam and the e mergent secondary beam, either the analyzer needs to be tracked over a +/-20 degrees angle or secondary poloidal deflector plates need to be installed at the exit port. Toroidal deflector plates will be install ed at both the injection and exit ports to compensate for toroidal dis placements and deflections. The sample volumes generated by this proce dure are within a few centimeters of the locations derived from a full three-dimensional calculation. (C) 1997 American Institute of Physics .