Simulations of negative ion extraction from a multi-aperture ion source in the presence of the magnetic filter |
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| Authors: | M. Turek J. Sielanko |
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| Affiliation: | 1. Institute of Physics, Maria Curie-Sk?odowska University, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin, Poland;2. Institute of Computer Science, Maria Curie-Sk?odowska University, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin, Poland;1. Department of Physics, University of Helsinki, P.O. Box 43, Helsinki FI-00014, Finland;2. School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK;3. School of Computing, Science and Engineering, University of Salford, Manchester M5 4WT, UK;1. Rudjer Boskovic Institute, Bijeni?ka 54, 10000 Zagreb, Croatia;2. Center for Accelerator Science, ANSTO, Locked bag 2001, Kirrawee Dc, NSW 2232, Australia;3. Jozef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia;1. Department of Crystal Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary;2. Research Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary;3. MDF-Lab, “Nello Carrara” Institute of Applied Physics, IFAC-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy;4. “Enrico Fermi” Center for Study and Research, Piazza del Viminale 2, 00184 Roma, Italy;1. University of California, San Diego, 9500 Gilman Drive #0417, La Jolla, CA 92093, USA;2. Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA;3. Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany;1. CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France;2. ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul Lez Durance, France;1. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, People''s Republic of China;2. Collaborative Innovation Center of Quantum Matter, Beijing 100084, People''s Republic of China |
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| Abstract: | The particle-in-cell method based numerical model of negative ion beam extraction from a large volume multi-aperture ion source is briefly described. The model takes into account the influence of the transversal magnetic field and diffusion of electrons across the field. The current-voltage curves for H- ions and electrons are presented. The results are compared for the three cases: without filter field; with the field but without diffusion; and with the field and electron diffusion. The presence of the magnetic filter field increases H? yields significantly (by 200%). A random-walk electron diffusion model enables electrons to travel through the magnetic field, which reduces a nonphysical effect of excessive electron aggregation in the filter region. The changes of filter width do not alter H? current more than 10%. |
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