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TUO2AB02 |
Halo Matching for High Intensity Linacs and Dedicated Diagnostics | |
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| Minimizing beam losses is one of the biggest challenge of very high power linac (MW range). In some cases, beam matching concentrating on minimizing emittance growth is not the most appropriate approach; a direct matching of the halo itself is preferable. We propose a method consisting in minimizing the beam extent, using the Particle Swarm Optimization algorithm that is well suitable to nonlinear systems governed by many parameters. In this article, an application of halo matching simulations is given in the case of the IFMIF superconducting linac. Development of dedicated diagnostics for in-situ implementation of this method on linacs are briefly presented. The beam diagnostic types and locations needed for machine tuning with halo matching are detailed. | ||
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Slides TUO2AB02 [7.922 MB] | |
WEO4LR01 |
New Methods and Concepts for Very High Intensity Beams | |
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| For very high intensity beams, not only beam power but also space charge is a concern, so that both aspects should be taken into considerations for any analysis. Beam blowup due to space charge forces can be mitigated by bringing closer the focusing and accelerating components, making the beam diagnostic implementation difficult. A clear strategy for beam diagnostic has to be defined. Beam halo is no longer negligible but plays a significant role in the dynamic of the beam and in the particle loss process. Beam optimization must take it into account and beam characterization must describe not only the core part but also the halo one. This paper presents the new concepts and methods for beam analysis, beam diagnostics, beam optimization and beam characterization. | ||
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Slides WEO4LR01 [3.342 MB] | |
| THO2LR04 | Catalogue of Losses for the Linear IFMIF Prototype Accelerator | 360 |
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| One major activity of the EVEDA (Engineering Validation and Engineering Design Activities) phase of the IFMIF (International Fusion Materials Irradiation Facility) project consists in building, testing and operating, in Japan, a 125 mA/9 MeV deuteron accelerator, called LIPAc, which has been developed in Europe. For the accelerator safety aspects, a precise knowledge of beam loss location and power deposition is crucial, especially for a high intensity, high power accelerator like LIPAc. This paper presents the beam dynamics simulations allowing to estimate beam losses in different situations of the accelerator lifetime: starting from scratch, beam commissioning, tuning or exploration, routine operation, sudden failure. Some results of these studies are given and commented on. Recommendations for hot point protection, beam stop velocity, beam power limitation are given accordingly. | ||
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Slides THO2LR04 [2.790 MB] | |