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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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| TUIO02 |
Reflections on the life of Richard Geller
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179 |
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A review of the life of Richard Geller.
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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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| WECO-A02 |
Status of the ECRIS Charge State Breeding Project at TRIUMF
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183 |
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- F. Ames, R. A. Baartman, P. G. Bricault, K. Jayamanna, M. McDonald, P. Schmor
TRIUMF, Vancouver
- T. Lamy
LPSC, Grenoble
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Efficient and fast charge state breeding is an important parameter for the acceleration of radioactive ions at ISOL facilities. Most on-line ion sources produce only singly charged ions but efficient accelerators require high charge states. Tests of an ECRIS as charge breeder (14 GHz PHOENIX from Pantechnik) have been performed on a test bench at TRIUMF mainly focussing on the optimization of the efficiency and breeding time. After this the source has been moved on-line to the ISAC facility. Mass separated beams of radioactive ions from the on-line ion sources can be directed into the source as well as ions from a Cs test ion source. The latter will be used for commissioning the system and setting up and optimizing the performance of the source as well as the transport of the highly charged ions to the accelerator. A summary of the results obtained at the test bench and first results from the on line commissioning will be presented.
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Slides
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