Highly Charged Ion Transmission Through Individual Insulating Glass Capillaries

In this thesis projects highly charged ion transmission through individualinsulating glass capillaries was studied at CIMAP (CAEN, France). Both27keV Ar9+low energy and71MeV Xe]9+high energy ion beams were injectedinto glass capillaries and transmitted after which they were detected by a twodimensional delay line anode position sensitive detector (PSD). Moreover, ineach experiment two types of capillaries have been compared. These are thetapered-shaped capillary with taper angle varying along the capillary axis andthe conical-shaped capillary with the taper angle being constant all along thecapillary axis.In the low energy range transmission, guiding, and beam blocking are ob?served in our experiments for the two types of capillary at injected intensitiesof1，5,10pA. For the tapered capillary a blocking electrostatic ifeld located atthe tapered part is invoked for interpreting the blocking phenomenon. The timeevolution of conical capillary guiding is observed in details at an injected inten?sity of~10pA and a scenario including several charge patches is introduced forexplaining the dynamical evolution.In the MeV energy range, the obtained ’doughnut’ shape images on thePSD for the conical capillary and the halo structure for the tapered capillaryare attributed to small angle Rutherford scattering. Furthermore, energy loss isrevealed by time of lfight spectra, taking the advantage of the10MHz pulsedincident beam. A simulation based on cascade Rutherford scattering for heavyions is consistent with the experimental results. This result shows clearly thatthe guiding process does not hold for such high energy ions.