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| TUCO-A03 |
60 GHz Electron Cyclotron Resonance Ion Source for Beta-Beams
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131 |
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- T. Thuillier, C. Fourel, J. Giraud, T. Lamy, L. Latrasse
LPSC, Grenoble
- F. Debray, J. M. Dumas, P. Sala, C. Trophime
GHMFL, Grenoble
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Electron Cyclotron Resonance Ion Sources (ECRIS) are very efficient to produce continuous and pulsed ion beams. The ECRIS scaling laws show that the plasma density increases as the square of the microwave frequency. Consequently, the efficiency, the average charge of the ionic charge state distribution and the extracted currents increase as well. LPSC is developing a 60 GHz pulsed ion source prototype. In order to have efficient ionization, the ion source volume has to be small, and due to the frequency value, the magnetic field has to be high (6 T at the injection, 3 T at the extraction, a closed surface with |B| = 2.1 T and a magnetic mirror of 4 T). The generation of the high magnetic field requires the use of helix techniques developed at GHMFL. As a first approach, a cusp structure has been chosen. 2D and 3D simulations were used to define the geometry of the helixes. Calculus has shown that it is necessary to use 2 groups of 2 coaxial helixes. An aluminum helix prototype has been machined to test at low current density the accuracy of the calculations. The axial magnetic field of the prototype was measured and results are in very good agreement with the numerical values.
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Slides
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| WECO-A01 |
New Configuration and Results with the LPSC Charge Breeder
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180 |
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- T. Lamy, J. Angot, C. Fourel, T. Thuillier
LPSC, Grenoble
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Funding: This work is supported by EU within the EURONS network under Contract No. RII3-506065.
A 1+ surface ionisation source has been used to produce Sodium and Rubidium beams in order to compare the PHOENIX Booster capture efficiency for different ion masses but with the same beam optics. Yields of 1.9% for 23Na6+ and 3.5% for 85Rb15+, with charge breeding times of 8,6ms/q and 4,6ms/q respectively have been measured. 1+ and n+ emittance measurements are presented along with the capture sensitivity to different parameters (DeltaV plots). Technical modifications have been performed to the charge breeder : replacement of the plasma chamber to allow a double frequency operating (14 + 18 GHz), modification of the injection magnetic plug to reinforce the axial magnetic field and correct its dissymmetry in the 1+ beam deceleration zone, insulation improvement to allow 60kV operation for the SPIRAL2 project. First charge breeding experimental results at 14 and 18GHz in the new configuration are presented and discussed for Rb beams
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Slides
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