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| TUCO-A01 |
Conceptual Design of a 56 GHz ECR Ion Source Magnet Structure
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127 |
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- C. M. Lyneis, S. Caspi, P. Ferracin, D. Leitner, S. Prestemon, G. L. Sabbi, D. S. Todd, F. Trillaud
LBNL, Berkeley, California
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Funding: This work was supported by the Director, Office of Science, OFfice of High Energy and Nuclear Physics, Division of Nuclear Physics, US Department of Energy under Contract No. DE-AC02-05CH11231.
The development of a 4th Generation ECR ion source, which could operate at 56 GHz twice that of 3rd Generation sources, presents several technical challenges.* The greatest challenge is to produce a magnet structure with sufficient field strength to adequately confine the plasma. A design study is underway to determine the feasibility and engineering issues associated with a magnet structure that could produce 8 T at injection, 6 T at extraction and 4 T radially. The initial analysis shows that peak fields in the superconductor would be roughly 12 to 14 T and this is above Bc2 for NbTi but less than Bc2 for Nb3Sn. We are evaluating two possible designs; the classic design, where the sextupole coils are places inside the solenoids and the inverted design where the sextupole is placed outside the solenoid magnets. The preliminary results of the ongoing study are being presented and discussed.
* Claude M Lyneis, D. Leitner, D. S. Todd, G. Sabbi, S. Prestemon, S Caspi and P. Ferracin, Rev. Sci. Instrum. 79, 02A321 (2008)
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Slides
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| TUCO-A02 |
Gasdynamic ECR Sources of Multicharged Ions
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128 |
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- V. Skalyga, A. Bokhanov, S. Golubev, I. Izotov, A. Mansfeld, S. Razin, V. Sidorov, V. Zorin
IAP/RAS, Nizhny Novgorod
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А new type of pulsed sources of multicharged ions(MCI), namely, a gasdynamic ECR source is proposed. Its main difference from the classical ECR ion sources is a different, quasi-gasdynamic regime of plasma confinement in a magnetic trap. Plasma was produced and heated by radiation of a pulsed gyrotrons with the frequencies of 37.5 and 75 GHz in magnetic traps of various configurations. Plasma confinement in quasi-gasdynamic regime under such conditions was studied. It was demonstrated that with such a confinement regime it is possible to generate multicharged ions and create intense(more than 1 А/cm2) ion fluxes through the trap plugs. Creation of intense plasma fluxes allows one to extract high-current MCI beams of high brightness. Transverse homogeneity of a plasma flux makes it possible to use a multi-aperture extraction system for the formation of broad intense MCI beams. MCI beams with current up to 150mA and normalized emittance lower than 1 π·mm·mrad were produced. Comparison of results of calculations and data of experiments shows that they are in a good agreement, which allows us to predict creation of a new type of ECR source.
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Slides
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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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