Diagnosis and dynamics in a simple low energy medium current electron beam channel |
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| Affiliation: | 1. NILPRP, Acc. Lab., RO-77125 Bucharest, Romania;2. National Institute for Lasers Plasma and Radiation Physics, Institute for Space Sciences, Atomistilor 111, P.O. Box MG-23, RO-77125 Bucharest, Romania;3. ICPE Electrostatica S.A., RO-74204 Bucharest, Romania;1. ICRR, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan;2. High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;1. Université de Lyon, F-69622 Lyon, France;2. Creatis, CNRS UMR 5220, F-69622 Villeurbanne, France;3. Centre de Lutte Contre le Cancer Léon Bérard, F-69373 Lyon, France;4. IPNL, CNRS UMR 5822, F-69622 Villeurbanne, France;5. CNDRI, INSA-Lyon, F-69621 Villeurbanne Cedex, France;6. IBA, B-1348 Louvain-la-Neuve, Belgium;1. Laboratory of Microbial Ecology and Technology, Department of Biological and Chemical Engineering, National Institute of Applied Sciences and Technology (INSAT), 2 Boulevard de la Terre, B.P. 676, 1080 Tunis, University of Carthage, Tunisia;2. National Center for Nuclear Sciences and Technologies (CNSTN), Tunis cedex, 2020, Tunisia;3. Mediterranean Institute of Ecology and Palaeoecology UMR CNRS/IRD 193, IMEP Case 441, FST Saint Jérôme, Université Paul Cézanne, Av. Escadrille Normandie-Niemen, 13397 Marseille cedex 20, France |
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| Abstract: | We present a simple experimental setup and an associated method enabling both the non-destructive diagnosis and the calculation of the beam evolution in a low energy medium current electron beam channel, where the space-charge and emittance effects are comparable. The diagnosis makes use of an axially symmetric magnetic lens while a second lens is added to increase the flexibility in the beam processing. The paper emphasizes the three steps involved in the method: the evaluation of the lenses' magnetic field by numerical simulation, the beam diagnosis, and the computation of the beam envelope. The calculation of the magnetic field is based on the finite element method. Subsequently, the beam parameters at the electron source exit – emittance and cross-over radius and position – are found with the modified three gradient method. Finally, the beam dynamics are modeled with the K–V equation adapted for the particular case of axial symmetry. The results obtained in this paper can be used to optimize technological processes, such as welding, hardening, cladding, and surface alloying. |
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