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The VINCY Cyclotron has to accelerate ions operating with the harmonic number of the RF voltage equal to 1, 2, 3 and 4. Two different central region configurations have been designed in order to satisfy the need for the broad ranges of ion species and energies that are expected to be obtained from the machine. The latest design of the spiral inflec...
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... 8: Radial betatron amplitude estimation. In Figure 8 estimated radial amplitudes are at the level of ~ 1.2 mm near the final radius, which provides a needed high quality of the beam at the extraction. Concluding one can note that the ion beam centring, phase slip (Figure 9) and energy gain as well as the emitances (Figure 10 and Table 2) and transmission coefficient (~40%) were found to be satisfactory.
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Compact superconducting isochronous cyclotron C400 [1] has been designed at IBA (Belgium) in collaboration with the JINR (Dubna). This cyclotron will be used for radiotherapy with proton, helium or carbon ions. The ions extracted from the source and transported with the axial line are bent into the median plane of the cyclotron by a spiral inflecto...
A superconducting cyclotron C400 able to accelerate carbon ions up to 400 MeV/amu and H2+ up to 260 MeV/amu has been designed at IBA (Belgium) in collaboration with JINR (Russia). The ions extracted from the source and transported with the axial line are bent into the median plane of the cyclotron by a spiral inflector. The optimal design of the in...
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... It is need to take into account the space charge beams effect by the high intensity beam modeling and optimization [1][2][3][4][5]. ...
... The particle tracing in the structure selected by TRACE3D calculation was performed, using the information on the output beam from the cyclotron. A beam simulation taking into account the space charge effects was conducted by the home-made CBDA code [2]. Space charge effects were estimated using the PIC approach with 20,000 micro-particles, presenting the bunched beam. ...
... The results are given inTable 2. It can be seen that the necessary dispersion of the beam on energy was produced in the injection channel as to eliminate a mismatch between the injection parameters and the beam, i.e. beam widening in the ring [4]. The improved qualities of the injected beam as compared to the previous case [2] permits a substantial (by a factor of 4, up to ~ 40%) increase in the intensity of the particles captured into the ring [4].Figure 6: Dispersion estimation at injection point, 130 µA beam intensity. ...
A source of 1.75 MeV protons was designed for detection of explosives using the gamma ray resonant absorption technique [1]. The facility consists of a compact cyclotron, a beam delivery system (BDS) and a storage ring. Given the marginal request for the beam intensity and quality, H¯ ions were selected for acceleration in the cyclotron aiming at the high efficiency extraction by electrostatic deflector. The tracking calculations in the cyclotron were performed with the beam space charge effects taken into account [2]. The parameter selection of the BDS structure elements by the TRACE3D code [3] was performed. Dispersion control at the injection point to the ring was provided by insertion of dedicated structure elements in the injection channel. The set of the optical elements is wide enough to regulate the beam parameters at the target point (beta functions and dispersion) to cope with expected experimental uncertainties in the settings of the cyclotron and storage ring. The overall performance of the facility was optimized by adjusting the corresponding parameters of the cyclotron and the BDS in order to provide a necessary intensity and quality of the beam for injection to the storage ring.
A novel method for efficient analysis of ion beam acceleration in an isochronous cyclotron is proposed. Numerical simulation is used to perform multiple beam dynamics analyses on the conveniently chosen subsets of data; consequently, the total quantity of studied data is significantly reduced. The obtained results provide direct insight into beam behavior and quality of acceleration. Therefore, the analysis is not only efficient, but detailed and systematic as well. It is used to assess the impact of the accelerated orbit optimization to the enhancement of acceleration efficiency when study is extended from a single test ion to the complete ion beam consideration.
This paper describes the modeling and optimization of the parameters of the structural elements of the compact cyclotron.
In particular, the optimization of the centering procedure by selection of the accelerated ion central trajectory and the
corresponding inflector parameter is considered.
During the design of a cyclotron the time and attention dedicated to the injection and extraction of a beam usually overcome those devoted to the acceleration. However, the efficiency of the accelerating process largely contributes to the overall efficiency of the machine because the beam spends the most time in the accelerating region. A thorough and systematic study of the influence of beam parameters on the overall quality of acceleration is performed. The conditions for the optimal acceleration are determined and the method for defining the complete continuous sets of input parameters providing such acceleration is proposed.
