| Paper | Title | Page |
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| MOPAB19 | Space-Charge Compensation of Intense Ion Beams by Nonneutral Plasma Columns | 67 |
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Gabor lenses were conceived to focus a passing ion beam using the electrical field of a confined nonneutral plasma column. Beside its application as focusing device, in Gabor lenses space-charge effects can be studied in detail. The influence of the electron distribution on emittance and space-charge dominated ion beams was investigated in beam transport experiments*. In this contribution we want to emphasize one result of these experiments. The measurements indicated a strong contribution of secondary electrons on beam dynamics. Secondary electrons are produced within the transport channel, particularly by interaction of the beam with the surface of the slit-grid emittance scanner. This might lead to an increase of the filling degree and to an improved focusing performance of the lens. Assuming that the loss and production rates within the lens volume and the transport channel determine the equilibrium state of the nonneutral plasma column, the electron cloud was characterized as a function of the external fields and the residual gas pressure in small-scale table top experiments. In this contribution experimental results will be presented in comparison with numerical simulations.
* K. Schulte, “Studies on the focusing performance of a Gabor lens depending on nonneutral plasma properties”, PhD thesis, 2013. |
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