Abstracts Brochure - 2nd International Particle Accelerator Conference

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een probed, the injection energy (450 GeV) and the collision energy (3.5 TeV). The results obtained are presented. For high LHC bunch intensities the Beam-Beam force is strong enough to expect orbit effects if the two beams do not collide head-on but with a crossing angle. As a consequence the closed orbit changes. The closed orbit of an unperturbed machine with respect to a machine where the Beam- Beam force become more and more important has been studied and the results are presented. Sub Classification: D02 Non-linear Dynamics - Resonances, Tracking, Higher Order Poster Panel 55 ID: 3038 - WEPC068 The Spin Aberration of Polarized Beam in the Electrostatic Ring, Yurij Senichev, Rudolf Maier, Denis Zyuzin (FZJ, Jülich) - Analytical solution for components of the spin vector is recorded in the form of transform matrixes for different electrostatic elements. These matrixes are used for numerical simulation of spin motion in the electrostatic ring for arbitrary particle in a similar way to phase motion. By this method we investigate behaviour of spin at different initial spin orientation and different beam energy. For a beam with nonzero transverse emittance at particle passage through a non-uniform electric field, for example an electric focusing lens, the orientation of a spin vector becomes function of phase variables that leads to the spin aberration. We investigate this process analytically and numerically. Sub Classification D02 Non-linear Dynamics - Resonances, Tracking, Higher Order Poster Panel 56 ID: 3778 - MOPS029 Experiments with a Fast Chopper System for Intense Ion Beams, Hannes Dinter, Martin Droba, Marcel Lotz, Oliver Meusel, Ilja Mueller, Daniel Noll, Ulrich Ratzinger, Kathrin Schulte, Christopher Wagner, Christoph Wiesner (IAP, Frankfurt am Main) - Chopper systems are used to pulse charged particle beams. In most cases, electric deflection systems are used to generate beam pulses of defined lengths and appropriate repetition rates. At high beam intensities, the field distribution of the chopper system needs to be adapted precisely to the beam dynamics in order to avoid aberrations. An additional challenge is a robust design which guarantees reliable operation. For the Frankfurt Neutron Source FRANZ, an E×B chopper system is being developed which combines static magnetic deflection with a pulsed electric field in a Wien filter � 17 configuration. It will generate proton pulses with a flat top of 50 ns at a repetition rate of 250 kHz for 120 keV, 200 mA beams. For the electric deflection, pre-experiments with static and pulsed fields were performed using a helium ion beam. In pulsed mode operation, ion beams of different energies were deflected with voltages of up to ±6 kV and the resulting response was measured using a beam current transformer. A comparison between experiments and theoretical calculations as well as numerical simulations are presented. Sub Classification: D04 High Intensity in Linear Accelerators Poster Panel 57 ID: 2706 - MOPS034 Progress on Space Charge Compensation Study in Low Energy High Intense H+ Beam, Pengnan Lu, Zhiyu Guo, Shi Xiang Peng, Zhi Zhong Song, Jin Xiang Yu, Zhong Xi Yuan, Jie Zhao (PKU/IHIP, Beijing), YingJun Ma (CIAE, Beijing), Haitao Ren (Graduate University, Beijing) - This article draws emphasis on the correlation between the space charge compensation (SCC) and the beam quality in different operation conditions. Theoretical improvement has been made to the model of Particle Life Span � PLS � which was developed in Peking University. In the improved model the thermal motion of electrons is considered with relaxed assumptions. And more detailed boundary conditions are used in calculating particle distribution. Based on the theoretical analysis three series of experiments have been conducted. Firstly, transport efficiency beam intensity, beam profile and emittance variation are quantitatively studied together with energy spectra of Compensation Gas Ions (CGI) in 50KeV/100mA H+ beam. Secondly, to explore better SCC efficiency we tested the function of ring electrodes in inhibiting electron escape. Moreover both Ar and Kr were used as comparison of different compensation gas. Lastly, SCC with pure additional electrons from a transverse electron gun is preliminarily experimented. All results will be presented and discussed in the text for seeking the best circumstances in SCC dominated low energy high intensity ion beams. Sub Classification: D04 High Intensity in Linear Accelerators
Poster Panel 58 ID: 3631 - MOPS030 Beam Dynamics of the FRANZ Bunch Compressor using Realistic Fields with a Focus on the Rebuncher Cavities, Daniel Noll, Long Phi Chau, Martin Droba, Oliver Meusel, Holger Podlech, Ulrich Ratzinger, Christoph Wiesner (IAP, Frankfurt am Main) - The ARMADILLO bunch compressor currently being designed at IAP is capable of reaching a longitudinal pulse compression ratio of 45 for proton beams of 150 mA at 2 MeV. It will provide one nanosecond proton pulses with a peak current of 7.7 A. The system guides nine linac micro bunches deflected by a 5 MHz rf kicker and uses four dipole magnets - two homogeneous and two with field gradients - to merge them on the target. For longitudinal focusing and an energy variation of ±200 keV two multitrack rf cavities are included. ARMADILLO will be installed at the end of the Frankfurt Neutron Source FRANZ making use of the unique 250 kHz time structure. This contribution will provide an overview of the layout of the system as well as recent advances in component design and beam dynamics of the compressor. Funding Agency: Work supported by HIC for FAIR. Sub Classification: D04 High Intensity in Linear Accelerators Poster Panel 59 ID: 3745 - MOPS038 3D Beam Dynamic Simulation in Heavy Ion Superconducting Drift Tube Linac, Alexandr Vyacheslavovich Samoshin, Sergey Markovich Polozov (MEPhI, Moscow) - The superconducting (SC) linac conventionally consists of some different classes of the identical cavities. Each cavity is based on a SC structure with a high accelerating gradient. The low charge state beams require stronger transverse focusing. This focusing can be reached with the help of SC solenoid lenses. In this paper beam dynamics simulation obtain by smooth approximation and full field. Traditionally only the Coulomb field is taken into account for low energy beams. In this paper the computer simulation of heavy ion beam dynamics in superconducting (SC) linac will carried out by means of the "particlein-cell" method. Simulation results will present. Sub Classification: D04 High Intensity in Linear Accelerators Poster Panels 60 and 61 are manned by Sanghoon Kim because Moonsik Chae’s travel � 18 arrangements do not allow him to be in San Sebastian in time. Moonsik Chae’s work cannot be considered for the best poster prize. Poster Panel 60 ID: 3352 - MOPS035 Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linac, Sang-Hoon Kim, Moo- Hyun Cho, Hae-Ryong Yang (POSTECH, Pohang, Kyungbuk), Jong-Seok Oh (NFRI, Daejon), Won Namkung (PAL, Pohang, Kyungbuk) - RF linacs for high power beams are operated in the fully beamloaded condition for the power efficiency. In this condition, temporal energy spreads are induced by the transient beam loading effect. Irradiation sources require the beam energy of less than 10 MeV to prevent undesirable neutron production. In order to maximize the beam power and maintain the beam energy in a safe value, we need to suppress the temporal energy spreads. In an L-band travelingwave linac for irradiation sources, the high energy electrons are suppressed by the beam current modulation with the RF power modulation. As a result, the average beam energy and the corresponding beam power are improved by nearly 60% compared to the case without any modulations. Funding Agency Work partly supported by KAPRA and POSTECH Physics BK21 Program Sub Classification: D04 High Intensity in Linear Accelerators Poster Panel 61 Main Classification: 07 Accelerator Technology Sub Classification: T06 Room Temperature RF ID: 3599 - MOPC033 The Status of a 1.6-cell Photocathode RF Gun at PAL, MoonSik Chae, Juho Hong, In Soo Ko, Yong Woon Parc (POSTECH, Pohang, Kyungbuk), Changbum Kim, Sung-Ju Park (PAL, Pohang, Kyungbuk) - The high power beam test of the photocathode RF gun with four holes at the side of the full cell which is fabricated at PAL has been finished. With the gun test stand which consists of a 1.6 cell cavity, a solenoid magnet, beam diagnostic components and auxiliary systems such as ICT, spectrometer, YAG scintillator and screens, Faraday cup, etc. Basic diagnostics such as the measurements of charge, energy and its spread, transverse emittance has been performed and it confirms a successful fabrication of the RF gun. Here we present the process of the beam test and the results
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Abstracts Brochure - 2nd International Particle Accelerator Conference

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