This research demonstrates the capability of controlled, focused ion beam (FIB)–assisted tailoring of morphologies in both multiwall carbon nanotubes (CNTs) and Y junction nonlinear CNT systems through defect engineering. We have shown that a 30 keV FIB Ga ion beam at low ion milling currents of 1 pA can be used to partially reduce the CNT diameter, to provide electrical conduction bottleneck m...

Ion-induced beam instabilities and tune shifts are critical issues for the electron damping ring of the International Linear Collider (ILC). To avoid conventional ion trapping, a long gap is introduced in the electron beam by omitting a number of successive bunches out of a long train. However, the beam can still suffer from the fast ion instability, driven by ions that last only for a single p...

and electron plasma frequency, respectively, and b b v c is the directed ion beam velocity normalized to the speed of light. The electromagnetic field perturbations excited by the ion beam pulse in this regime are calculated analytically, and verified by comparison with the numerical simulations. The degrees of beam charge neutralization and current neutralization are estimated, and the transv...

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The electron beam ion source MAXEBIS from Frankfurt University has been installed in a test beam setup at GSI to deliver highly charged ions for HITRAP [1] and to serve for charge state breeding experiments. Two ion sources dedicated to the production of singly charged ions for external ion injection have been connected to a so-called multi passage spectrometer (MPS), which is an integral part ...

This work presents the latest results of an ongoing effort to simulate the extraction from ECR ion sources and the Low Energy Beam Transport (LEBT). Its aim is to help understand the influence of parameters like initial ion distributions at the extraction aperture, ion temperatures and beam neutralization on the quality of the beam and to provide a design-tool for extractionand transport-system...

BACKGROUND AND PURPOSE To understand the mechanisms involved in the strong killing effect of carbon-ion beam irradiation on cancer cells with TP53 tumor suppressor gene deficiencies. MATERIALS AND METHODS DNA damage responses after carbon-ion beam or X-ray irradiation in isogenic HCT116 colorectal cancer cell lines with and without TP53 (p53+/+ and p53-/-, respectively) were analyzed as follo...

Three-dimensional molecular dynamics simulations of ion beam assisted deposition ~IBAD! are performed to determine the mechanisms of crystallographic texture selection during the IBAD of polycrystalline films. A face centered cubic bicrystal consisting of @111# and @110# oriented grains is grown while an ion beam bombards the growing film at normal incidence. As the film grows, the grain bounda...

Electron cooling at the injection energy of the heavy ion synchrotron SIS results in beam pulses of higher intensity and exceptional quality. The beam parameters after cooling have been measured and verify a reduction of the phase space volume by more than three orders of magnitude. Beam transfer of the cooled ion beam is much easier because of the reduced emittance. The time required to fill t...

A new type of a pulsed ion beam accelerator named “bipolar pulse accelerator (BPA) ”has been proposed to improve the purity of the intense pulsed ion beam. In order to confirm the principle of the BPA, we have developed a bipolar pulse generator and a prototype of the accelerator. When the bipolar pulse generator was operated at 70 % of the full charge condition, the bipolar pulse with the firs...