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MOPPA026 |
The Deflecting Cavities (Wobbler) Assembling for High-Energy Heavy Ion Hollow Beam Formation | |
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Funding: "Rosatom", contract #N.4e.45.90.1065 The study of high-energy-density in matter (HEDM) is one of the most challenging and interesting topics in modern physics. An intense ion beam can be used to achieve low-entropy compression of a sample material like hydrogen or ice that is enclosed in a heavy cylindrical tamper shell. Such a target will be driven by a hollow beam with an annular focal spot. This experiment was called LAPLAS (Laboratory Planetary Sciences) at the FAIR project*. In the experiment, it will be possible to achieve physical conditions that exist in the interior of giant planets, Jupiter and Saturn. Another goal of the LAPLAS experiment will be to study the problem of hydrogen metallization. In order to make a hollow beam with an annular focal spot it has been proposed to rotate the ion beam around the longitudinal axis with a high frequency using a radio frequency deflecting system (Wobbler). The Wobbler consisted of two four-cell H-mode deflecting cavities with a resonant frequency of 297 MHz is under development. The deflecting cavities of the Wobbler system were manufactured and assembled. The measured electro-dynamics characteristics of the cavities as well as methods used for the cavities frequency tuning are presented. * High Energy Density Matter Research Using Intense Heavy Ion Beams at the Future FAIR Facility at Darmstadt, N A Tahir et. al., IFSA2007 |
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| TUPPB018 | Simulation of Hollow Ion Beam Formation Line | 353 |
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Heavy ion beams can be used for the matter extreme state generation*, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper** system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP***, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly.
* V. Fortov et al. NIM A 415, p.20 (1998). ** S. Minaev et al. NIM A 620, р.99 (2010). *** S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010). |
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