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• W89560911 abstract "DESIGN OF THE EXTRACTION SYSTEM OF THE SUPERCONDUCTING ECR ION SOURCE VENUS* M.A. Leitner ∗∗ , D.C. Wutte, C.M. Lyneis LBNL, Berkeley, CA 94720, USA Center Solenoid Lens [0.479 m] Ion Source Injection [-0.52 m] Plasma Outlet Hole [0 m] Analyzing Magnet Entrance [1.303 m] Abstract A new, very high magnetic field superconducting ECR ion source, VENUS, is under construction at the LBNL 88-Inch Cyclotron [1,2]. The paper describes the VENUS extraction system and discusses the ion beam formation in the strong axial magnetic field (3 T) of the ECR ion source. Emittance values as expected from theory, which assumes a uniform plasma density across the plasma outlet hole, are compared with actual measurements from the AECR-U ion source. Results indicate that highly charged heavier ions are concentrated on the source axis. They are extracted from an “effective” plasma outlet hole, whose smaller radius must be included in ion optics simulations. Ion Beam Axial Magnetic Field [T] Superposition Source Field Solenoid Field 1 SOURCE DESIGN The magnet structure of VENUS, which consists of three superconducting axial coils and six superconducting radial coils in a sextupole configuration, will generate a maximum axial field of 4 Tesla at the injection side and 3 Tesla at the extraction side. The maximum sextupole field is 2 Tesla at the plasma chamber wall. These high magnetic fields are designed to allow operation with 28 GHz ECR-heating frequency, twice the frequency of current ECR sources. Since the plasma density is expected to scale as frequency squared we anticipate to extract significantly more intense (factor of 4 to 5) ion beams than presently achievable by ECR ion sources. To transport these intense heavy ion beams the extraction system and mass-analyzing system of the ion source is designed for a proton-equivalent current of 25 mA at 30 kV extraction voltage. Ion Source Center Axis [m] Figure 1: Magnetic field distribution of the VENUS ion source, its extraction region, and a subsequent solenoid lens for matching the ion beam to the analyzing magnet. azimuthal momentum in the ion beam, which leads to a considerable emittance increase. 2.1 Influence of the magnetic field The VENUS extraction region has been simulated and optimized with IGUN [3], an axi-symmetric ion optics code for plasma extraction allowing the inclusion of multiple charge states with different space charge contributions. A charge state distribution (from the existing AECR-U ion source) scaled up to the expected higher beam intensities of 25 mA proton-equivalent current has been used as input to the simulations. Calculations have been performed by simulating only a single charge state of interest. The space charge contribution of the whole charge state distribution has been normalized to the equivalent current of the simulated charge state. This method is explained in reference [4]. It has been shown [4] that such a procedure allows an accurate extraction simulation in the presence of a strong axial magnetic field. In addition, simulations using multiple charge states have been performed to investigate the space charge effects due to the mass dependent focusing action of the magnetic field. For an ECR extraction system two main contributions to the ion beam emittance have to be considered: (1) the ion beam temperature and (2) the induced beam rotation due to the decreasing axial magnetic field. 2 EXTRACTION Figure 1 shows the magnetic field distribution of the ion source, its extraction region, and a subsequent solenoid lens for matching the ion beam to the analyzing magnet. Extraction and beam formation take place in a strong (up to 3T) axial magnetic field, which leads to significantly different focusing properties for the different ion masses and charge states of the extracted beam. Due to the large size of the cryostat (including the iron yoke) the extracted ion beam has to be transported without additional focusing element for ~48 cm. In this region the magnetic field drops from 3 to zero Tesla inducing a strong * This work was supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Nuclear Physics Division of the U.S. Department of Energy under Contract DE AC03-76SF00098. ** MLeitner@lbl.gov ; http://ecrgroup.lbl.gov" @default.
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• W89560911 date "2001-05-07" @default.
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• W89560911 title "Design of the extraction system and beamline of the superconducting ECR ion source VENUS" @default.
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