| Paper | Title | Page |
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| MOPO-15 | Permanent Magnets Under Irradiation and Radioactive Alkali Ion Beam Development for SPIRAL I | 102 |
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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 | |
| WECO-B02 | The Light Ion Guide CB-ECRIS Project at the Texas A&M University Cyclotron Institute | 194 |
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| Texas AM is currently configuring a scheme for the production of radioactive-ion beams that incorporates a light-ion guide (LIG) coupled with an ECRIS constructed for charge-boosting (CB-ECRIS). This scheme is part of an upgrade to the Cyclotron Institute and is intended to produce radioactive beams suitable for injection into the K500 superconducting cyclotron. The principle of operation is the following: the primary beam interacts with a production target placed in the gas cell. A continuous flow of helium gas maintains a constant pressure of 500 mbar maximum in the cell. Recoils are thermalized in the helium buffer gas and ejected from the cell within the gas flow through a small exit hole. The positively charged recoil ions (1+) are guided into a 2.5 m long rf-only hexapole and will be transported in this manner on-axis into the CB-ECRIS. The CB-ECRIS will operate at 14.5 GHz and has been specially constructed by Scientific Solutions of San Diego, California for charge-boosting. An overall image of the entire project will be presented with details on different construction phases. Specific measurements and results will be presented as well as future developments. | ||
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Slides | |
| WECO-B03 | MISTIC: Radiation Hard ECRIS | 198 |
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The ISAC RIB facility at TRIUMF utilizes up to 100 μA from the 500 MeV H- cyclotron to produce RIB using the ISOL method. At the moment, a hot surface, a laser and a FEBIAD ion source are used to produce RIB. These ion sources are not suitable for gaseous elements like Ne, C, O, N and F which are key nuclei in nuclear astrophysics research at TRIUMF. However, these elements can be ionized efficiently by an ECRIS. By combining a high frequency electromagnetic wave and a magnetic confinement, the ECRIS can produce high energy electrons essential for efficient ionization of these elements. To this end, a prototype ECRIS called MISTIC (Monocharged Ion Source for TRIUMF and ISAC Complex) has been build at TRIUMF using a design similar to the one developed at GANIL [1]. Conventional ECRIS cannot be used at ISAC because of the high radiation field created when high energy proton beam impinges the target. In order to achieve a radiation hard ion source, electromagnetic coils replace the permanent magnets. Preliminary tests for Ne, Kr and Xe showed that MISTIC is very stable over a large range of frequencies, magnetic field configurations and pressures.
[1] GANIL (Grand Accelerateur National d'Ions Lourds), Bd Henri Becquerel, B. P. 55027, 14076 CAEN Cedex 5, France |