Characteristics of compact solid-target charge exchange analyzers for energetic ion diagnostics on tokamaks

Compact electrostatic charge exchange analyzers (18×18×13 cm) have been constructed for installation in areas of high magnetic fields and restricted access near tokamak fusion devices. The analyzers employed carbon stripping foils, and have been calibrated for proton and deuteron energies between 1 and 70 keV. They have been successfully used to study charge exchange losses in auxiliary-heated tokamak plasmas and were found to be ideally suited to supplement the larger and more complex gas-cell analyzers by providing additional spatial and temporal information at a modest effort and cost.