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| THCO-C01 |
ECRIS's Extraction: A New Way to Increase the Brightness of a Beam
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224 |
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- L. Maunoury, C. Pierret
CIMAP, Caen
- J. Y. Pacquet
GANIL, Caen
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Funding: European network ITS LEIF: Contract Number 026015
One of the goals pursued by the people working on ion sources is to provide the highest beam intensity in the smallest emittance. As the computer power has increased so fast for the last years, it is possible nowadays to simulate with more accuracy the extraction of the ECR ion sources taking into account the several Physics processes involved in the beam creation. From the last chapter of the paper written by R. Leroy and coworkers [1], it has been shown experimentally that the intensity of a beam can be improved significantly by biasing the plasma electrode. The idea was to use the isolated plasma electrode as a 'biased disk'. We have calculated the influence on the extracted ion trajectories of this additional potential (from +3 V down to -100 V). The simulations have been computed for the MONO1000 and SUPERSHyPIE ion sources. All the simulations showed an increase of the brightness of the beam with more or less gain depending on the extraction voltage and the extraction conditions. A recent experiment performed on the MONO1000 ECRIS has confirmed the feasibility of this method: a gain of 40% in terms of emittance has been obtained on an 84Kr1+ beam.
[1] R. Leroy et al., Proceedings of the 12th International Workshop on ECR Ion Sources, April 25-27, 1995, RIKEN, Japan
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Slides
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| MOPO-15 |
Permanent Magnets Under Irradiation and Radioactive Alkali Ion Beam Development for SPIRAL I
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102 |
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- M. Dubois, J. A. Alcantara Nunez, R. Alves Conde, C. Barue, C. Canet, M. Dupuis, J. L. Flambard, R. Frigot, P. Jardin, C. Leboucher, N. Lecesne, P. Lecomte, P. Leherissier, F. Lemagnen, J. Y. Pacquet, A. Pichard, M. G. Saint-Laurent
GANIL, Caen
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Up to now, eighteen Target Ion Source Systems (TISS) have been built and used for the production of radioactive ion beams on SPIRAL I facility, based on the Isotope Separator On Line method. The TISS's are composed of a helium or argon target and of the fully permanent magnet ECRIS Nanogan III. After irradiation and a period of two years for radioactive decay, the irradiated TISS is dismounted and if its magnetic field is still suitable, the magnetic systems is renewed and associated to a new target. Thereby thirty two runs have been performed using new or renewed TISS's. Sometimes, the measurement of the magnetic field after irradiation shows a degradation of the permanent magnet. The feed-back of our experience is reported here. In a second part, we present the progress on the NanoNaKE setup, which aims to extend the radioactive ion beams on SPIRAL I to the alkali elements, by associating a surface ion source to the Nanogan III ECRIS via a compact 1+ ion beam line. The main issues and difficulties are discussed and the preliminary solutions are described.
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Poster
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