Abstracts Brochure - 2nd International Particle Accelerator Conference

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at both energies bunching leads to severe beam loss. The estimated transverse space charge tune shifts during the rf bunching indicate that resonance crossing might be responsible for the observed the beam loss. The influence of the tune shift will be further evaluated through resonance measurements. Sub Classification: A11 Beam Cooling Poster Panel 43 ID: 3291 - WEPS080 Magnet Design and Particle Tracking of Helium Ion FFAG Accelerator, Huanli Luo (USTC/NSRL, Hefei, Anhui) - As helium ion source, the periodic focusing structure model of Helium ion (He+) FFAG (Fixed-Field Alternating Gradient) accelerator was designed, providing He+ beam with higher beam current at a lower cost, which could be used for the study of the impact of Helium embitterment on fusion reactor envelope material. A radial sector scaling FFAG accelerator type with eight super-periods and a conventional magnetic lattice structure, a triplet focusing lattice- DFD combination, is adopted for He+ FFAG accelerator. In this paper, magnetic lattice is optimizing by analytical and numerical techniques. A large-aperture magnet is designed by using a 3D magnetic field simulation code OPERA-3D. Runge- Kutta tracking code used specifically for FFAG accelerator based on MATLAB language was used to track the particle in the magnetic field generated by OPERA-3D, followed by linear and nonlinear beam dynamics study. Some results of magnet design, particle tracking and dynamics study are presented in the article. Sub Classification: A12 FFAG, Cyclotrons Poster Panel 44 ID: 2030 - WEPS098 Combined Momentum Collimation Method in High-intensity Rapid Cycling Proton Synchrotrons, Jin-Fang Chen, Jingyu Tang, Ye Zou (IHEP Beijing, Beijing) - A new momentum collimation method – so-called combined momentum collimation method in high-intensity synchrotrons is proposed and studied here, which makes use two-stage collimation in both the longitudinal and the transverse phase planes. The primary collimator is placed at a high-dispersion location of an arc, and the longitudinal and transverse secondary collimators are in the same arc and in the down-stream dispersion-free long straight section, respectively. The particles with positive momentum deviations will be scattered and � 13 degraded by a carbon scraper and then cleaned mainly by the transverse collimators, whereas the particles with negative momentum deviations will be scattered by a tantalum scraper and mainly cleaned by the longitudinal secondary collimators in the successive turns. Numerical simulation results using TURTLE and ORBIT codes show that this method gives high collimation efficiency for medium-energy synchrotrons. The studies have also shown two interesting effects: one is that the momentum collimation is strongly dependent on the transverse beam correlation; the other is that the material for the primary collimator plays an important role in the method. This work was supported by the National Natural Science Foundation of China (10975150, 10775153), the CAS Knowledge Innovation Program-“CSNS R&D Studies”. Funding Agency Sub Classification: A15 High Intensity Accelerators Poster Panel 45 ID: 2909 - THPS021 Methods to Obtain High Intensity Proton Ion Beams with Low Emittance from ECR Ion Source at Peking University, Haitao Ren (Graduate University, Beijing), Zhiyu Guo, Pengnan Lu, Shi Xiang Peng, Zhi Zhong Song, Jin Xiang Yu, Meng Zhang, Jie Zhao, Quanfeng Zhou (PKU/IHIP, Beijing), Jia-er Chen (PKU/IHIP, Beijing; NSFC, Beijing) - With the development of accelerator technology, to obtain an ion beam with high intensity and low emittance is becoming one of the main goals of research for ion sources. At Peking University we have developed several 2.45 GHz electron cyclotron resonance (ECR) ion sources for different projects and we paid close attention to the beam intensity increasing as well as the beam emittance reduction. Methods are adopted to improve beam intensity by increasing the density of plasma inside the discharge chamber, optimizing the geometry pinch effect and the perveance at the extraction aperture. To suppress the emmitance increasing of an extracted beam, the shape of the electrodes as well as the voltage of suppression electrode are carefully selected With these efforts, a 120 mA total proton beam has been extracted from the permanent magnet ECR ion source at 50 kV, and the measured normalized rms emittance is less than 0.2 pi.mm.mrad. The beam current density at the extraction aperture is about 420 mA/cm2. Sub Classification: T01 Proton and Ion Sources
Poster Panel 46 ID: 1786 - THPS033 Skew Quadrupole Effects on Multi-turn injection Efficiency in SIS18, Wafa Mahmood Daqa, Ingo Hofmann, Jurgen Struckmeier (GSI, Darmstadt) - One goal of the SIS18 upgrade scheme is concerned about improving the multi-turn injection (MTI) efficiency, in order to reach the required intensities at the targets and to operate effectively as a booster for SIS100. To improve the limitation of the MTI scheme, there were successful attempts in AGS and PS boosters, to use the skew injection scheme and later it was suggested for SIS18. The strength of the skew quadrupoles is optimized together with the horizontal tune, the difference in horizontal to vertical tunes, the � 14 incoming beam parameters and the geometrical limitation of SIS lattice. A good optimization implies the emittance exchange, due to linear coupling, to take place partially and just before the return of the beamlet back to its original position at the septum. The present work was done by simulation using the code PARMTRA and compared with measurements. The results show that, depending on the working point, the skew injection scheme can improve the MTI efficiency from 5% up to 15%, taking into account the loss on the septum from inside and on the vertical acceptance. Funding Agency DAAD ( Deutscher Akademischer Austausch Dienst) Sub Classification: T12 Beam Injection/Extraction and Transport
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Abstracts Brochure - 2nd International Particle Accelerator Conference

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