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multipole

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MOPP003 Study of Abnormal Vertical Emittance Growth in ATF Extraction Line emittance, extraction, simulation, quadrupole 553
 
  • M. Alabau, A. Faus-Golfe
    IFIC (CSIC-UV), Valencia
  • M. Alabau, P. Bambade, J. Brossard, G. Le Meur, C. Rimbault, F. Touze
    LAL, Orsay
  • D. Angal-Kalinin, J. K. Jones
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Appleby, A. Scarfe
    UMAN, Manchester
  • S. Kuroda
    KEK, Ibaraki
  • G. R. White, M. Woodley
    SLAC, Menlo Park, California
  • F. Zimmermann
    CERN, Geneva
  Since several years, the vertical emittance measured in the Extraction Line (EXT) of the Accelerator Test Facility (ATF) at KEK, that will transport the electron beam from the ATF Damping Ring (DR) to the future ATF2 Final Focus beam line, is significantly larger than the emittance measured in the DR itself, and there are indications that it grows rapidly with increasing beam intensity. This long-standing problem has motivated studies of possible sources of this anomalous emittance growth. One possible contribution is non-linear magnetic fields in the extraction region experienced by the beam while passing off-axis through magnets of the DR during the extraction process. In this paper, simulations of the emittance growth are presented and compared to observations. These simulations include the effects of predicted non-linear field errors in the shared DR magnets and orbit displacements from the reference orbit in the extraction region. Results of recent measurements using closed orbit bumps to probe the relation between the extraction trajectory and the anomalous emittance growth are also presented.  
 
MOPP005 The 2 mrad Crossing Angle Scheme for the International Linear Collider extraction, quadrupole, optics, linear-collider 556
 
  • R. Appleby
    UMAN, Manchester
  • D. Angal-Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • P. Bambade, S. Cavalier, G. Le Meur, F. Touze
    LAL, Orsay
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  The present baseline configuration of the ILC has a 14 mrad crossing angle between the beams at the interaction point. This allows easier extraction of the beams after collisions, but imposes on the other hand more constraints on the control of the beams prior to colliding them. Moreover, some limitations to physics capabilities arise, in particular because of the degraded very forward electromagnetic detector hermeticity and because calibration procedures for (gaseous) tracking detectors become more complex. To mitigate these problems, alternative configurations with very small crossing angles are studied. A new version of the 2 mrad layout was designed last year, based on simpler concepts and assumptions. The emphasis of this new scheme was to satisfy specifications with as few and feasible magnets as possible, in order to reduce costs. Recent progress designing several of the magnets involved and the particular vacuum chamber needed in the shared part of the beam line is reported.  
 
MOPP015 Continuously Adjustable Permanent Magnet Quadrupole for a Final Focus quadrupole, coupling, permanent-magnet, dipole 583
 
  • T. Sugimoto, M. Ichikawa, Y. Iwashita, M. Yamada
    Kyoto ICR, Uji, Kyoto
  • M. Kumada
    NIRS, Chiba-shi
  • S. Kuroda, T. Tauchi
    KEK, Ibaraki
  A permanent magnet quadrupole with continuous strength adjustability has been fabricated. It has a five-ring-singlet structure, which was proposed by R. L.Gluckstern. Its small overall diameter allows an outgoing beamline to pass closeby. Since the permanent magnet pieces do not have any vibration source in themselves, this magnet could be used as a quadrupole in a final focus doublet. Such a quadrupole system is described.  
 
MOPP037 Alignment of the CLIC BDS alignment, simulation, luminosity, radiation 628
 
  • A. Latina, D. Schulte, R. Tomas
    CERN, Geneva
  Aligning the CLIC Beam Delivery System faces two major challenges, the tight tolerances for the emittance preservation and its strong non-linear beam dynamics. For these reasons conventional beam-based alignment techniques, like dispersion free steering, are only partially successful and need to be followed by optimization algorithms based on other observables, like beam sizes.  
 
MOPP047 Simulation Studies on the Vertical Emittance Growth at the Existing ATF Extraction Beamline emittance, extraction, damping, coupling 652
 
  • F. Zhou, J. W. Amann, S. Seletskiy, A. Seryi, C. M. Spencer, M. Woodley
    SLAC, Menlo Park, California
  Significant dependence of the vertical emittance growth on the beam intensity was experimentally observed at the Accelerator Test Facility (ATF) at KEK extraction beamline. This technical note describes the simulations of possible vertical emittance growth sources, particularly in the extraction channel, where the magnets are shared by both the ATF extraction beamline and its damping ring. The vertical emittance growth is observed in the simulations by changing the beam orbit in the extraction channel, even with all optics corrections. The possible reasons for the experimentally observed dependence of the vertical emittance growth on the beam intensity are discussed. An experiment to measure the emittance versus beam orbit at the existing ATF extraction beamline is underway*.

*M. Alabau et al. Study of Abnormal Vertical Emittance Growth in ATF Extraction Line, this proceeding.

 
 
TUPP089 Implementation of Fringe Field Dipole Magnets into the V-Code Beam Dynamics Simulation Tool simulation, dipole, focusing, vacuum 1738
 
  • S. S. Franke, W. Ackermann, B. Steiner, T. Weiland
    TEMF, Darmstadt
  • J. Enders, C. Hessler, Y. Poltoratska
    TU Darmstadt, Darmstadt
  Fast online beam dynamics simulations can advantageously assist the machine operators at various particle accelerator machines because they provide a more detailed insight into the actual machine status. Based on the moment approach a fast tracking code named V-Code has been implemented at TEMF. Within the SFB 634 project the V-Code beam dynamics simulation tool is supposed to be installed at the Superconducting Darmstadt LINear ACcelerator S-DALINAC which is designed as a re-circulating linear accelerator. In order to be able to simulate the entire beam line, an implementation of fringe field dipole magnets is mandatory. Unlike a hard edged field approach the fringe fields influence the beam focusing and its inhomogeneity results in a non-circular bunch motion. For an accurate reproduction of the transverse motion specialized techniques to obtain and to handle the reference path in V-Code together with the 3D-field data along the curved trajectory had to be developed. In the paper a summary of implementation details together with simulation results will be provided.  
 
TUPP099 Improvement of RFQSIM rfq, simulation, focusing, acceleration 1762
 
  • J. M. Maus, A. Schempp
    IAP, Frankfurt am Main
  RFQSIM has constantly been developed at IAP to simulate multiple particles dynamic of RFQs which include simulations of high current applications, decelerators, debuncher and rebuncher e.g. for the medical application. The latest work to improve RFQSIM include the option to change the modulation and or the aperatur of the simulated RFQ to produce the same acceleration and or focusing efficiency than the two term potential gives for different electrode geometries. Additional work was done to improve the graphical analysis during runtime as well as the change of all routines to be compatible with the Fortran F95 standard. The maximum number of particles to be simulated was increased to 200k. The paper shows examples of results for the high current application like the of the p-linac and the new HLI injector for GSI and for transition sections.  
 
TUPP105 Theoretical Field Analysis for Superferric Accelerator Magnets Using Elliptic Multipoles and its Advantages dipole, synchrotron, simulation, magnet-design 1773
 
  • P. Schnizer, E. S. Fischer
    GSI, Darmstadt
  • P. G. Akishin
    JINR, Dubna, Moscow Region
  • B. Schnizer
    TUG/ITP, Graz
  FAIR will build a set of accelerators and storage rings at GSI Darmstadt. Nearly all of them transport beams of elliptical shape (SIS 100, CR, NESR, RESR, SuperFRS). Magnetic field calculations as well as magnetic measurements provide precise field information, which is used to improve the properties of machine using numerical simulations. We had developed elliptical multipoles fulfilling the Laplace equation which enable us to describe the field within the whole aperture consistently. Now the representation of these has been simplified considerably as compared to earlier ones. Meanwhile we found analytical expressions to derive circular multipoles directly from the elliptic multipoles. We illustrate the advantage of this data representation on SIS 100 magnet data and show how a concise set of harmonics can be derived from rotating coil measurements.  
 
WEPC041 The Injection System of the SSRF Storage Ring injection, kicker, storage-ring, septum 2076
 
  • H. H. Li, B. C. Jiang, L. G. Liu, X. Y. Sun, Y. Xu, W. Zhang, X. M. Zhou
    SINAP, Shanghai
  A multi-turn injection scheme with four kickers and two septa is used for injection into SSRF storage ring. The 3.5GeV electron beam from the SSRF booster is injected with 6.3 degrees horizontally. All injection elements are set in one 12m long straight section for the requirement of the top-up operation. Simulation and commissioning results will be presented in this paper, such as the injection efficiency and the disturbance on stored beam.  
 
WEPC097 Active Shimming of the Dynamic Multipoles of the BESSY UE112 APPLE Undulator injection, undulator, electron, dynamic-aperture 2222
 
  • J. Bahrdt, W. Frentrup, A. Gaupp, M. Scheer, G. Wuestefeld
    BESSY GmbH, Berlin
  APPLE undulators produce strong dynamic multipoles in the elliptical and inclined mode which can significantly reduce the electron beam dynamic aperture. The multipole strength scales with the square of the period length and the inverse of the electron energy. A large horizontal dynamic aperture is essential for top up operation. For the BESSY devices the dynamic multipoles generated in the elliptical mode have efficiently been compensated with iron shims. For the inclined mode no passive compensation scheme is available. In case of the strong BESSY 112mm APPLE device flat current wires have been glued onto the undulator chamber, which permit the cancellation of arbitrary multipoles. The full horizontal dynamic aperture has been recovered in the inclined mode. Tracking simulations and measurements of the electron beam performance for uncompensated and compensated dynamic multipoles will be presented.  
 
WEPC110 Development of a Conventional Multipole Wiggler MPW-80 wiggler, synchrotron, power-supply, electron 2258
 
  • D. J. Waterman, A. Deyhim, J. Kulesza, E. Van Every
    Advanced Design Consulting, Inc, Lansing, New York
  • K. I. Blomqvist
    MAX-lab, Lund
  The design for an 80 mm period hybrid wiggler is presented. The design requirements and mechanical difficulties for holding, positioning, and driving the magnetic arrays are explored. The structural and finite element analysis, magnetic design, and electrical considerations that influenced the design are then analyzed. This wiggler will be installed at ALBA a new synchrotron radiation source being built at the site of the Centre Direccional in Cerdanyola del Vallès, nearby Barcelona, and will produce ultra-violet and X-ray beams of exceptional brightness. The facility will comprise a 3 GeV electron storage ring, injected from a ~100 MeV linac through a full energy booster synchrotron.  
 
WEPC122 Magnetic Characterization of an APPLE-II Undulator Prototype for FERMI@Elettra undulator, quadrupole, sextupole, controls 2294
 
  • B. Diviacco, R. Bracco, C. Knapic, D. La Civita, D. Millo, M. Musardo, G. Tomasin, D. Zangrando
    ELETTRA, Basovizza, Trieste
  The FERMI@Elettra free electron lasers will use APPLE-II undulators in the radiating sections to provide variably polarized photon beams. In preparation of the manufacturing of the final devices a prototype has been developed in order to test different methods of magnetic field optimization. For this purpose, an existing variable-gap support structure was equipped with a new mechanical interface providing the required longitudinal shifting of the magnetic arrays. Permanent magnet blocks were mounted on short modules and their field integrals measured using a stretched wire system. Field optimization was iteratively performed by proper selection of the modules to be mounted based on measurements of the partially assembled undulator structure. The results of the final magnetic field characterization are presented showing the achieved trajectory, phase and multipole errors. These results are compared with those of a previous assembly where the same modules were mounted in random order. Further improvements obtained by shimming and application of “magic fingers” are finally described.  
 
WEPC130 Shimming Correction of Dynamic Multipole Effects on Apple-II Type EPUs at the ALS polarization, undulator, injection, simulation 2311
 
  • C. Steier, A. Madur, S. Marks, S. Prestemon, T. Scarvie, D. Schlueter, W. Wan
    LBNL, Berkeley, California
  Elliptically Polarizing Undulators that provide full photon polarization control also have fast, intrinsic transverse roll-off of the magnetic field. The roll-off is particularly fast for vertical polarization settings, and can have big detrimental effects on the nonlinear single particle dynamics. Particularly low and medium energy light sources and long period EPUs are prone to those effects. The three existing 50mm period EPUs at the ALS have been retrofitted with shims to correct for these dynamic multipole effects and a new 90mm period device which otherwise would have caused a huge reduction in dynamic aperture has been shimmed before installation. Simulations and beam measurements will be presented, including frequency map measurements.  
 
WEPC133 Status of the PETRA III Insertion Devices undulator, controls, insertion, insertion-device 2320
 
  • M. Tischer, M. Barthelmess, U. Englisch, J. Pflueger, A. Schoeps, J. Skupin
    DESY, Hamburg
  The PETRA storage ring is presently reconstructed towards a third generation light source. In total, 14 undulator beamlines will be available in the new octant of the machine. We report on the status of Petra III undulators. Three prototypes with 29mm period length, two 2m and one 5m long device have been investigated by mechanical and magnetic measurements. The prototype results are the basis for the refined design of the remaining 8 planar devices which are in the procurement phase. We present preliminary magnetic results of the prototypes and also report on the APPLE–2 and the in-vacuum undulator for PETRA III.  
 
WEPC143 System for Local Magnetic Field Measurement System Based on a Coil with Three Square Millimeter undulator, alignment, impedance 2344
 
  • J. F. Citadini, R. Basilio, M. Potye, G. Tosin
    LNLS, Campinas
  We present a magnetic field measurement system based on a rotating coil with 3mm2 active area and approximately 500 turns to measure local magnetic field. The structure of a coil is not so complex, simplifying the evaluation of its sources of errors. The steps used to build the coil are shown as well as the performance of the measurement system. The calibration of the coil was made against a magnetic field generated by a solenoid with very well determined geometry.  
 
WEPC153 Dipole Magnet for Use of RHIC EBIS HEBT Line dipole, sextupole, quadrupole, octupole 2365
 
  • T. Kanesue
    Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
  • M. Okamura, D. Raparia, J. Ritter
    BNL, Upton, Long Island, New York
  We present the design optimization of a dipole magnet for use of RHIC EBIS HEBT line. This magnet provides a total bending angle of 145 degrees by two identical magnets and it is used to guide H+ to Au32+ beam with energy of 2 MeV/amu. Magnetic field is required to change within 1 second corresponding to the ion species, so magnet body has the laminated structure to suppress eddy current. Effective length and field quality within a radius of 5 cm was optimized separately. Effective length was optimized by adjusting end shape not to change the beam orbit between low and high field operation more than 1 mm from intended beam orbit after bending. Then field quality was optimized by changing the shim position and additional bump. After modification, all multipole coefficients along the beam trajectory were reduced to within 10x10-4.  
 
WEPC154 Design and Fabrication of Multipole Corrector Magnet controls, power-supply, quadrupole, octupole 2368
 
  • F.-Y. Lin, C.-H. Chang, H.-H. Chen, C.-S. Hwang, C. Y. Kuo
    NSRRC, Hsinchu
  The Taiwan Light Source (TLS) had started to operate in top-up mode injection since October 2005. Meanwhile, the Elliptically Polarized Undulator (EPU5.6) was operated very well in the decay mode operation. However, the partial beam loss had occurred when the top-up injection was executed at magnet gap and magnet array phase are fixed at the minimum gap and π(vertical polarization mode), respectively. In order to solve the partial beam loss, we design a new multipole corrector magnet to be installed in the downstream of the EPU5.6 to compensate for the multipole field error. This multipole magnet can provide the normal and skew components of the dipole, quadrupole, sextupole, octople, and dodecapole field components. Changeable multipole field components mechanism has been designed by using a special electric circuit. In addition, the measurement systems of Hall probe and stretch wire are used to measure the field quality of the multipole corrector magnet. This report will discuss the magnet circuit design, mechanical design, the switching mechanism of the multipole field components, and the field measurement results.  
 
WEPC156 Development and Adjustment of the EMMA Quadrupole Magnets quadrupole, dipole, electron, controls 2374
 
  • N. Marks, B. J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • M. J. Crawley, F. T.D. Goldie, B. Leigh
    Tesla Engineering Limited, West-Sussex
  The non-scaling FFAG EMMA, now under construction at STFC’s Daresbury Laboratory, requires 84 quadrupoles. Because of the unusual nature of these magnets*, prototypes for the F and the D type quadrupoles were required. These magnets were ordered from and constructed and measured by Tesla Engineering. Subsequently, design changes have been made and modifications to the prototypes carried out. The paper will give engineering details of these prototypes, of the measurement results obtained using a rotating coil magnetometer and subsequent adjustments to clamp plates and pole profiles needed to obtain optimum three dimensional gradient quality. As a result of these developments, the construction of the magnets for the complete ring is now underway.

*B. J.A. Shepherd & N. Marks, “Quadrupole Magnets For The 20MeV FFAG, ‘EMMA’”, PAC 2007 (MOPAN107).

 
 
WEPC160 Eddy-current Effect on Field Multipoles Arising in Dipole Magnets with Elliptic and Rectangular Beam Pipe dipole, vacuum, quadrupole, coupling 2383
 
  • E. Perevedentsev, A. L. Romanov
    BINP SB RAS, Novosibirsk
  We present an analytical evaluation of the field-distortion effect from eddy currents induced by variation of magnetic field of dipole magnets with elliptic or rectangular beam pipe of finite conductivity. The pipe sizes and aspect are arbitrary except that for practical reasons we assume the pipe wall thickness is small as compared to the skin depth. Handy formulas are presented for the field multipoles arising from non-round shape of the beam pipe.  
 
WEPC165 Magnetic Measurements of the SSRF Storage Ring Magnets quadrupole, sextupole, storage-ring, dipole 2395
 
  • J. D. Zhang, Q. G. Zhou
    SINAP, Shanghai
  The SSRF storage ring comprises a total of 460 magnets which has four types and eight different effective magnetic lengths. The magnetic measurements of all the production magnets including 40 bending magnets with a maximum field of 1.2726 T, 200 quadrupoles divided in Three families with a maximum gradient of 20 T/m, 140 sextupoles with a maximum second order differential of 460 T/m, and 80 correctors with a maximum kick capability of 1.2 mrad. For the dipoles a long coil system has been used to measure the magnetic field while for the quadrupoles and sextupoles a rotating coil system has been used to determine the magnitude of the high order multipoles. In this paper the analysis of these data is discussed and results for measured magnets are presented.  
 
WEPD014 Magnets for the MANX 6-D Muon Cooling Demonstration Experiment dipole, quadrupole, simulation, superconductivity 2434
 
  • V. S. Kashikhin, N. Andreev, V. Kashikhin, M. J. Lamm, K. Yonehara, A. V. Zlobin
    Fermilab, Batavia, Illinois
  • M. Alsharo'a, R. P. Johnson, S. A. Kahn, T. J. Roberts
    Muons, Inc, Batavia
  MANX is a 6-dimensional muon ionization-cooling experiment that has been proposed to Fermilab to demonstrate the use of a helical cooling channel (HCC) for muon beam emittance reduction for future muon colliders and neutrino factories. The HCC for MANX has solenoidal, helical dipole, and helical quadrupole magnetic components, which diminish as the beam loses energy as it slows down in the liquid helium absorber inside the magnet. The proposed magnet system design is comprised of coil rings positioned along a helical path, which will provide the desired solenoidal and helical dipole and quadrupole fields. Additional magnets that provide emittance matching between the HCC and the upstream and downstream spectrometers are also described. The results of a G4Beamline simulation of the beam cooling behavior of the magnet and absorber system will be presented.  
 
WEPD021 Magnetic Field Characteristics of a SIS 100 Full Size Dipole vacuum, dipole, injection, synchrotron 2452
 
  • P. Schnizer, E. S. Fischer
    GSI, Darmstadt
  • P. G. Akishin
    JINR, Dubna, Moscow Region
  • R. V. Kurnyshov
    Electroplant, Moscow
  • B. Schnizer
    TUG/ITP, Graz
  • P. A. Shcherbakov
    IHEP Protvino, Protvino, Moscow Region
  • G. Sikler, W. Walter
    BNG, Würzburg
  FAIR will feature two superconducting fast ramped synchrotrons. The dipole magnets for one of them, SIS 100, have been designed and prototypes were built. The properties of the magnetic field were analysed using OPERA (for DC operation) and ANSYS for dynamic calculations. Elliptic multipoles fulfilling the Laplace Equation in plane elliptic coordinates describe the field within the whole aperture consistently within a single expansion. Further circular multipoles, valid within the ellipse, can be calculated analytically from the elliptic multipoles. The advantage of this data representation is illustrated on the FEM calculation performed for SIS 100 dipoles and quadrupoles currently foreseen for the machine. The magnetic field of one of these prototypes was measured using a mole. We compare the results of the calculation to the measurement for the static as well as the dynamic mode.  
 
WEPD031 Dependence of the Static and Dynamic Field Quality of the LHC Superconducting Dipole Magnets on the Pre-cycle Ramp Rate injection, dipole, sextupole, acceleration 2479
 
  • N. J. Sammut, L. Bottura, G. Deferne, W. Venturini Delsolaro, R. Wolf
    CERN, Geneva
  • N. J. Sammut
    University of Malta, Faculty of Engineering, Msida
  The allowed multipoles in the Large Hadron Collider (LHC) superconducting dipole magnets decay whilst on a constant current plateau. It is known that the decay amplitude is largely affected by the powering history of the magnet, and particularly by the pre-cycle flat top current and duration and the pre-injection preparation duration. Recently, it was observed that the decay amplitude is also highly dependent on the pre-cycle ramp rate, which has an indirect effect also on the sample of data taken at constant field along the magnet loadlines. This is an important consideration to be included in the Field Description for the LHC (FiDeL), to cope with the difference between the test procedure followed for series tests and the expected cycles during the machine operation. This paper presents the results of the measurements performed to investigate this phenomenon and describes the method included in FiDeL to represent this dependence.  
 
WEPD033 A Demonstration Experiment for the Forecast of Magnetic Field and Field Errors in the Large Hadron Collider dipole, sextupole, controls, quadrupole 2482
 
  • N. J. Sammut, R. Alemany-Fernandez, L. Bottura, G. Deferne, M. Lamont, J. Miles, S. Sanfilippo, M. Strzelczyk, W. Venturini Delsolaro, P. Xydi
    CERN, Geneva
  • N. J. Sammut
    University of Malta, Faculty of Engineering, Msida
  In order to reduce the burden on the beam-based feedback, the Large Hadron Collider (LHC) control system is embedded with the Field Description for the LHC (FiDeL) which provides a forecast of the magnetic field and the multipole field errors. FiDeL has recently been extensively tested at CERN to determine main field tracking, multipole forecasting and compensation accuracy. In this paper we describe the rationale behind the tests, the procedures employed to characterize and power the main magnets and their correctors, and finally, we present the results obtained. We also give an indication of the prediction accuracy that the system can deliver during the operation of the LHC and we discuss the implications that these will have on the machine performance.  
 
WEPP156 Spherical Aberrations-free Wiggler wiggler, sextupole, quadrupole, octupole 2853
 
  • A. A. Mikhailichenko
    Cornell University, Department of Physics, Ithaca, New York
  We represented details of design of a wiggler with linear piecewise longitudinal field dependence. This type of field distribution eliminates spherical aberrations in wiggler. This wiggler can be recommended for usage in cooler rings including ILC ones.  
 
THPC002 Synthesis of Optimal Nanoprobe (Nonlinear Approximation) octupole, focusing, quadrupole, controls 2972
 
  • S. N. Andrianov, N. S. Edamenko, Yu. V. Tereshonkov
    St. Petersburg State University, Applied Mathematics & Control Processes Faculty, St. Petersburg
  This paper is a continuation of the paper devoted to synthesis of optimal nanoprobe in linear approximation. Here the main goal is the optimization of nanoprobe including nonlinear aberrations of different nature up to third order. The matrix formalism for Lie algebraic methods is used to account for nonlinear aberrations. This method gives a possibility to consider nonlinear effects separately. Here we mean that a researcher can start or remove different kind of nonlinearities. This problem is separated into several parts. On the first step, we consider possibilities of additional optimization for some structures, selected on the step of linear approximation. The most of aberrations have harmful character, and their effect must be maximally decreased. Therefore, on the next steps, some we use analytical and numerical methods for generation of nonlinear corrected elements. The matrix formalism allows reducing the correction procedure to linear algebraic equations for aberration coefficients. Some examples of corresponding results are given.  
 
THPC034 Correction the Round Beam Lattice of VEPP-2000 Collider Using Orbit Response Technique closed-orbit, lattice, dipole, quadrupole 3053
 
  • A. L. Romanov, D. E. Berkaev, A. N. Kirpotin, I. Koop, E. Perevedentsev, Yu. A. Rogovsky, P. Yu. Shatunov, D. B. Shwartz
    BINP SB RAS, Novosibirsk
  Round colliding beams option in VEPP-2000 puts a number of strict requirements on the collider lattice. Orbit Response Matrix (ORM) technique is a versatile tool for lattice analysis and correction. For linear optical function study and correction, the orbit response to the dipole correctors is collected and processed, while for the orbit correction the quadrupole trimming is used. Theoretical and experimental responses of closed orbit on the same perturbations are compared to determine the most probable deviations of chosen parameters from its project values.  
 
THPC045 Beam Uniformization System Using Multipole Magnets at the JAEA AVF Cyclotron target, octupole, cyclotron, sextupole 3077
 
  • Y. Yuri, T. Agematsu, I. Ishibori, T. Ishizaka, H. Kashiwagi, S. Kurashima, N. Miyawaki, T. Nara, S. Okumura, K. Yoshida, T. Yuyama
    JAEA/ARTC, Takasaki
  It has been known that uniformization of a beam with a Gaussian profile is possible utilizing odd-order nonlinear forces*. Here, we investigate uniformization of the transverse beam profile using nonlinear-focusing forces produced by multipole magnets in detail. We show that it is possible to uniformize an asymmetric beam as well as a Gaussian beam utilizing the odd and even-order nonlinear forces in combination**. It enables us to perform high-uniformity irradiation at a constant particle fluence rate over the whole area of a large target. A research and development study of the beam uniformization system composed of sextupole and octupole magnets is now in progress at the JAEA AVF cyclotron facility. Some results of preliminary experiments on beam uniformization are also reported.

*P. F. Meads, Jr., IEEE Trans. Nucl. Sci. 30, 2838 (1983).
**Y. Yuri et al., Phys. Rev. ST Accel. Beams 10, 104001 (2007).

 
 
THPC055 Dynamic Aperture Studies for PETRA III Including Magnet Imperfections wiggler, dynamic-aperture, lattice, damping 3107
 
  • A. Kling, K. Balewski, W. Decking
    DESY, Hamburg
  • Y. J. Li
    BNL, Upton, New York
  PETRA III is a 3rd generation synchrotron radiation light source. Efficient injection in the top up mode requires a dynamic aperture of 30 mmmrad or larger, while a 2 hour Touschek lifetime needs an average momentum aperture of around 1.5 %. We present studies on the impact of recently measured magnet imperfections on the available dynamic aperture. To this end, tracking simulations have been performed including the effects of measured multipole errors of lattice magnets and of 20 four-meters-long damping wigglers.  
 
THPC057 Field Interference of Magnets in the Large Acceptance Storage Ring CR of the Fair Project dipole, quadrupole, simulation, dynamic-aperture 3113
 
  • O. E. Gorda, C. Dimopoulou, A. Dolinskii, F. Nolden, M. Steck
    GSI, Darmstadt
  The large acceptance storage ring CR is planned to be used for accumulation and cooling of rare isotope and antiproton beams at the future FAIR accelerator facility. The huge apertures as well as the close arrangement of the dipoles and quadrupoles make overlapping between the end fields of the magnets unavoidable. In addition, corrector magnets are planned to be installed in the drift sections between the dipoles and quadrupoles for closed orbit corrections. The presence of additional iron can have a significant influence on the magnetic field distribution. This interference can lead to a reduction of the integral field quality decline that is undesirable since it can affect the beam dynamics. In this contribution we present the results of 3D magnetic field simulations performed using the OPERA computer code. The field maps were derived and further analyzed. The corresponding sets of multipole components were calculated and were then implemented into one of the codes for the beam dynamics calculations. The MAD code was used to calculate the dynamic aperture and to estimate the effect of the field interference on the beam dynamics of the ring.  
 
THPC063 First Frequency Maps for Probing the Non-linear Dynamics of SOLEIL lattice, injection, quadrupole, insertion 3128
 
  • L. S. Nadolski, P. Brunelle, J.-P. Lavieville, P. Lebasque, A. Nadji, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette
  SOLEIL is a 2.75 GeV third generation synchrotron light source delivering photons to beam-lines since January 2007. With a 3.7 nm.rad horizontal emittance, its optics is based on a strong focusing lattice. Large on- and off-momentum apertures are required in order to provide good injection efficiency and as large as possible beam lifetime. It is then fundamental to be able to understand the limitations of these key figures. In order to probe the transverse non linear dynamics two pinger magnets have been installed into the injection straight section during last summer shutdown period. In this paper, their calibration will be described. Then first comparisons between modeled and real machine will be given for betatron tune shifts with amplitudes, and frequency maps. To end the non linear impact of insertion devices on beam dynamics will be discussed.  
 
THPC068 Effect of Magnetic Multipoles on the ALBA Dynamic sextupole, dynamic-aperture, quadrupole, dipole 3143
 
  • P. A. Piminov, E. B. Levichev
    BINP SB RAS, Novosibirsk
  • D. Einfeld
    ALBA, Bellaterra
  For modern synchrotron light sources the main limitation of dynamic aperture is due to the strong chromatic sextupoles. However, small multipole errors in magnetic elements can reduce the original dynamic aperture by generating high order resonances at the aperture boundary. For the ALBA synchrotron light source a dynamic aperture in the presence of magnetic multipoles in the main magnets was simulated by tracking code. Both systematic and random magnetic errors were taken into account. In this paper we report on the results of our considerations.  
 
THPP071 Construction of Six-sector FFAG Ring for Muon Phase Rotation power-supply, alignment, injection, vacuum 3524
 
  • Y. Arimoto, M. Aoki, S. Araki, Y. Eguchi, K. Hirota, I. Hossain, I. Itahashi, Y. Kuno, Y. Kuriyama, Y. Nakanishi, A. Sato, M. Y. Yoshida
    Osaka University, Osaka
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  • A. Kurup
    Imperial College of Science and Technology, Department of Physics, London
  • Y. Mori
    KURRI, Osaka
  • C. Ohmori
    KEK, Ibaraki
  • T. Oki
    Tsukuba University, Ibaraki
  PRISM is a next-generation of muon source which provides high purity, high intense and high brightness beam. In PRISM, a PRISM-FFAG is one of key section which make a muon beam narrow energy width by using phase rotation technique. To demonstrate the phase rotation, a six-cell FFAG ring has been constructed; the ring consists of full size of scaling-FFAG magnets and a high gradient rf cavity. The experiment is achieved by injecting alpha particles from a radioisotope source as a beam. Construction of the ring has been started from September, 2007; beam duct has been designed and installed, the six FFAG magnets has been aligned, etc. In this paper, we will present the design of the ring and the construction (alignment, etc) from engineering point of view.  
 
THPP075 Beam Dynamics of the IFMIF-EVEDA RFQ rfq, emittance, focusing, beam-losses 3536
 
  • M. Comunian, A. Pisent, P. A. Posocco
    INFN/LNL, Legnaro, Padova
  • E. Fagotti
    Consorzio RFX, Euratom ENEA Association, Padova
  The IFMIF project is aimed at the realization of an intense neutron beam facility for testing the irradiation of the materials to be used for fusion reactors. EVEDA (Engineering Validation Engineering Design Activities) is a first step towards the implementation of this challenging project and consists of the construction of prototypes of the main units. In particular INFN-LNL is in charge of the construction of a 5 MeV, 125 mA, deuteron RFQ at 175 MHz. In this article the main aspects of the beam dynamics design of this RFQ are described, namely the optimization of the length and the transmission issues, the main outcomes and comparison of the PARMTEQM and TOUTATIS codes used for the simulations and the basic aspects of the errors studies.