Keyword: multipole
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MOPOY002 Towards Beam-Dynamics Simulations Including More Realistic Field Descriptions for the HESR dynamic-aperture, quadrupole, lattice, dipole 847
 
  • J.H. Hetzel, U. Bechstedt, J. Böker, A. Lehrach, B. Lorentz, R. Tölle
    FZJ, Jülich, Germany
  
  The High Energy Storage Ring (HESR) is part of the upcoming Facility for Antiproton and Ion Research (FAIR) placed in Darmstadt (Germany). The HESR is designed for antiprotons with a momentum range from 1.5 GeV/c to 15 GeV/c, but will as well be suitable to provide heavy ion beams with a momentum range from approximately 0.6 GeV/c to 5.8 GeV/c. To guarantee smooth operation it is crucial to verify and improve the design with beam-dynamics simulations. Particularly the dynamic aperture is calculated as a measure of quality. Complementary to previous beam dynamics calculations based on frequency map analysis*, the dynamic aperture is calculated using a variant of the Lyapunov exponent. The first bending and focusing magnets have been delivered and the magnetic fields measured recently. So the modeled assumptions regarding the multipole imperfections of these elements are now replaced by values based on measurements. This contribution contains the inclusion of the measured values as well as the the tracking-based dynamic aperture calculations.
* D.M. Welsch, A. Lehrach, B. Lorentz, R.Maier, D. Prasuhn, R.Tölle: "Investigation and Optimization of Transverse Non-Linear Beam Dynamics in the High-Energy Storage Ring HESR"; IPAC'10 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY002  
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MOPOY018 The New RF Design of the 36 MHz-HSI-RFQ at GSI rfq, DTL, brilliance, quadrupole 883
 
  • M. Baschke, H. Podlech
    IAP, Frankfurt am Main, Germany
  • L. Groening, S. Mickat, C. Zhang
    GSI, Darmstadt, Germany
  
  In Darmstadt / Germany the existing accelerator cite GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded to fulfill the requirements with respect for intensity and beam quality. In a first step the 9.2 m long 36 MHz-HSI-RFQ for high current beams will get new electrodes to reach the specific frequency, to allow a higher electric strength and to avoid unwanted multipole components. Therefor several simulations with CST MWS have been done. The parameters and results of the RF-design will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY018  
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TUPMB004 ILSF Low Emittance Storage Ring Magnets dipole, sextupole, quadrupole, storage-ring 1107
 
  • F. Saeidi, J. Dehghani, M. Jafarzadeh, M. Moradi, J. Rahighi, M. Razazian
    ILSF, Tehran, Iran
  • R. Pourimani, F. Saeidi
    Arak University, Arak, Iran
  
  The Iranian Light Source Facility (ILSF) is a new 3 GeV synchrotron radiation laboratory in the design stage. The ILSF storage ring (SR) is based on a Five-Bend Achromat lattice providing an ultr-alow horizontal beam emittance of 0.48 nm-rad. The ring is consisting of 100 pure dipole magnets, 320 quadrupoles and 320 sextupoles. In this paper, we present some design features of the SR magnets and discuss the detailed physical and mechanical design of these electromagnets. The physical designs have been performed relying on two dimensional codes POISSON [1] and FEMM [2]. Three dimensional RADIA [3] and MERMAID [4] were practiced too, to audit chamfering values and get the desired magnetic length.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB004  
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TUPMB009 Vibrating Wire Measurements for the XiPAF Permanent Magnet Quadrupoles background, experiment, permanent-magnet, DTL 1124
 
  • B.C. Wang, M.T. Qiu, Z.M. Wang
    State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
  • C.T. Du, X.W. Wang, L. Wu, Q.Z. Xing, S.X. Zheng
    TUB, Beijing, People's Republic of China
  
  Vibrating wire technique is a promising measure-ment method for small-aperture Permanent Magnet Quadrupoles (PMQs) in linear accelerators and scan-ning nuclear microprobes. In this paper, we describe the improved vibrating wire setup for measuring an individual PMQ with the minimum aperture of several millimeters. This setup is aiming at measuring the magnetic center. The advantage of this setup is that any mechanical measurement on the wire, which may be the main error source, is avoided. Experiments of the 20 mm-aperture Halbach-type PMQs for Xi'an Proton Application Facility (XiPAF) DTL has been carried out. The research results of the magnetic center measurements show a precision of about 10 μm and robustness against the background magnetic field. Results of the magnetic center and field multipoles measurements agree with the ones obtained from the rotating coil.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB009  
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TUPMB012 Optimization of the Field Integrals of Two Small Gap IDs for CLS wiggler, undulator, vacuum, synchrotron-radiation 1133
 
  • M.F. Qian, Y.Z. He, H.F. Wang, W. Zhang, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  
  An in-vacuum undulator and an in-vacuum wiggler have been developed for CLS at SSRF recently. The period lengths of the undulator and the wiggler are 20mm and 80mm respectively. Both IDs have the minimum gap of 5.2mm. The field integrals were measured for each magnet block with two poles and were sorted in-situ as they were installed on to the girders. Finally the field integrals of the undulator and the wiggler were shimmed by using the 'Magic Fingers' at the ends with a special algorithm. This paper reports the procedure and the results of the measurement and the optimization for the field integrals.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB012  
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TUPMB013 PAL-XFEL Magnet Design and Magnetic Measurement dipole, quadrupole, undulator, laser 1136
 
  • H.S. Suh, S.-H. Jeong, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, K.-H. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  We have designed and tested magnets for PAL-XFEL of 10GeV in Pohang, Korea. These magnets consist of 6 families of 52 dipole magnets, 11 families of 236 quadrupole magnets, and 4 families of 108 corrector magnets. Two hall probe benches are used to measure the magnetic field. This paper reviews the main parameters of these magnets and the results of magnetic field measurements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB013  
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TUPMB018 Magnetic Measurements of SESAME Storage Ring Dipoles at ALBA dipole, injection, alignment, storage-ring 1148
 
  • J. Marcos, J. Campmany, V. Massana
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • A. Milanese, C. Petrone, L. Walckiers
    CERN, Geneva, Switzerland
  
  Funding: This work is partially supported by the EC under the CESSAMag project, FP7 contract 338602.
In this work we present the results of the measurement campaign of the main bending magnets of the SESAME storage ring, that were fully characterized at ALBA-CELLS magnetic measurements facility. A total of 17 combined function dipoles ' 16 series magnets plus a pre-series one ' has been tested and characterized. This campaign has been performed using a dedicated Hall probe bench. The main measurements include the transfer function at the center of the magnet and field maps of the three components of the field in a plane around the nominal trajectory of the electron beam, at two different operating currents. In this paper we describe the experimental setup and procedures, before reporting the main results, including statistics of magnet-to-magnet reproducibility and integrated field quality. Finally, we show how the measured data can be exploited for an optimal 3D alignment of the dipoles in the machine. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB018  
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TUPMB019 Detailed Characterization of MEBT Quadrupoles for the Linear IFMIF Prototype Accelerator (LIPAc) quadrupole, acceleration, dipole, synchrotron 1151
 
  • J. Marcos, J. Campmany, V. Massana
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • J. Castellanos
    UNED, Madrid, Spain
  • J. Castellanos, C. Oliver, I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • O. Nomen
    IREC, Sant Adria del Besos, Spain
  
  Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the Agreement as published in BOE, 16/01/2013, page 1988
The IFMIF-EVEDA* Linear IFMIF Prototype Accelerator (LIPac) is a 9 MeV, 125 mA CW deuteron accelerator to validate the technology to be used in the future IFMIF accelerator. The acceleration of deuterons will be done through two stages. The matching between them will be done in the Medium Energy Beam Transport line (MEBT). In this section, the transverse focusing of the beam is carried out by five quadrupole magnets with integrated steerers, grouped in one triplet and one doublet**. These magnets have been designed by CIEMAT, and manufactured by the Spanish company ANTECSA. After manufacturing, they were fully characterized at ALBA-CELLS magnetic measurements facility. In this paper we describe the characterization bench used to measure the magnets, the measurement protocol and the alignment procedure, as well as the results obtained and the iteration process followed in order to shim the magnets to fulfill with beam dynamics requirements.
* A. Mosnier et al., proceedings of IPAC10, MOPEC056, p.588, Kyoto, Japan (2010)
** C. Oliver, et alt, proceedings of IPAC11, WEPO014, p. 2424, San Sebastián, Spain (2011) 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB019  
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TUPMB032 Magnetic Field Characterisation of the First Series Dipole Magnet for the SIS100 Accelerator of FAIR dipole, superconductivity, sextupole, ion 1171
 
  • F. Kaether, E.S. Fischer, V. Marusov, A. Mierau, C. Roux, P. Schnizer, K. Sugita, H.G. Weiss
    GSI, Darmstadt, Germany
  
  The procurement of the SIS100 dipoles was contracted without building and testing an appropriate model magnet. So the thorough test of the first of series magnet is the key issue for the final realisation of the complete series production. The core of these tests is the measurement and analysis of the magnetic field of the first dipole. We describe the adapted measurement technics next to a detailed analysis of the obtained field quality and point out the critical issues of the series production  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB032  
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WEPOY041 Fast Tracking of Nonlinear Dynamics in the ESS Linac Simulator via Particle-Count Invariance sextupole, space-charge, proton, framework 3080
 
  • B.T. Folsom, E. Laface
    ESS, Lund, Sweden
  
  Real-time beam modeling has been used in accelerator diagnostics for several decades. Along the way, the theory for matrix calculations of linear forces has matured, allowing for fast calculations of a beam's momentum and position distributions. This formalism becomes complicated and ultimately breaks down with high-order beam elements like sextupoles. Such elements can be accurately modeled with a Lie-algebra approach, but these techniques are generally implemented in slower, offline multiparticle tracking software. Here, we demonstrate an adaptation of the conventional Lie techniques for rapid first-order tracking of position, which is accomplished by treating a bunch's particle count as an invariant.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY041  
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WEPOY048 Overview of the Design of the IBEX Linear Paul Trap ion, experiment, alignment, vacuum 3104
 
  • S.L. Sheehy
    JAI, Oxford, United Kingdom
  • D.J. Kelliher, S. Machida, D.C. Plostinar, C.R. Prior
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  We report on the status and design of the Intense Beam Experiment (IBEX) at RAL. This experiment consists of a linear Paul trap apparatus similar to the S-POD system at University of Hiroshima, confining non-neutral Argon plasma in an RF quadrupole field. The physical equivalence between this device and a beam in a linear focusing channel makes it a useful tool for accelerator physics studies including resonances and high intensity effects. We give an overview of the design and construction of IBEX and outline plans for commissioning and the future experimental programme.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY048  
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WEPOY050 A Differential Algebraic Framework for the Fast Indirect Boundary Element Method simulation, space-charge, framework, controls 3107
 
  • A.J. Gee, B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  • B. Erdelyi
    ANL, Argonne, USA
  
  Beam physics at the intensity frontier must account for the beams' realistic surroundings on their dynamics in an accurate and efficient manner. Mathematically, the problem can be expressed as a Poisson PDE with given boundary conditions. Commonly, the Poisson boundary value problem is solved locally within many volume elements. However, it is known the PDE may be re-expressed as indirect bound- ary integral equations (BIE) which give a global solution*. By solving the BIEs on M surface elements, we arrive at the indirect boundary element method (iBEM). Iteratively solving this dense linear system of form Ax = b scales like (miterations M2 ). Accelerating with the fast multipole method (FMM) can reduce this to O(M) if miterations << M. For N evaluation points, the total complexity would be O(M) + O(N) or O(N) with N = M. We have implemented a constant element version of this fast iBEM based on our previous work with the FMM in the differential algebraic (DA) framework**. This implementation is to illustrate the flexibility and accuracy of our method. A future version will focus on allowing for higher order elements.
* Sauter, S. and C. Schwab. Boundary Element Methods (2011)
** Abeyratne, S., S. Manikonda, and B. Erdelyi. "A novel differential algebraic adaptive fast multipole method." IPAC 2013: 1055-1057. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY050  
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THPMR026 SESAME Storage Ring Beam Dynamics in View of the Results of its Magnet Measurements dipole, quadrupole, storage-ring, alignment 3446
 
  • M. Attal, E. Huttel
    SESAME, Allan, Jordan
  
  SESAME storage ring magnets have been recently constructed and measured. The storage ring beam dynamics is reviewed in this article in view of these results. Moreover it is shown how the optical impact of dipoles main field errors is more mitigated by sorting dipoles in the storage ring in addition to the alignment optimization method suggested by magnetic measurement outcome.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR026  
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THPMR032 Dynamical Aperture Control in Accelerator Lattices With Multipole Potentials controls, lattice, resonance, octupole 3455
 
  • I.A. Morozov, E.B. Levichev
    BINP SB RAS, Novosibirsk, Russia
  
  We apply two analytical methods to control accelerator dynamic aperture (DA) with multipole potentials. Both methods assume that accelerator model can be represented as a product of unperturbed and perturbed exponential operators with exponent of perturbed operator given as formal power series in perturbation parameter and known dependence of series coefficients on lattice parameters such as multipole strength distribution. Normal form method can be applied to the above representation and then lattice parameters are used to control normal form Hamiltonian coefficients. Hamiltonian control can be used to compute control term and lattice parameters are then fitted to approximate corresponding controlled operator. Theoretical results as well as model examples are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR032  
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THPMR036 Improved Methods for the Measurement and Simulation of the CERN SPS Non-linear Optics optics, octupole, sextupole, impedance 3464
 
  • H. Bartosik, A. Oeftiger, M. Schenk, F. Schmidt, M. Titze
    CERN, Geneva, Switzerland
  
  Good knowledge of the non-linear properties of the SPS lattice is crucial for modelling and optimising the machine performance in the presence of collective effects leading to incoherent tune spreads such as space charge, e-cloud and beam coupling impedance. In view of the LHC injectors upgrade (LIU) project and the future SPS operation in a regime dominated by such collective effects, detailed measurements of the SPS non-linear chromaticity and detuning with amplitude have been performed for the two optics configurations presently available for LHC type beams. The measurement results are used to fit systematic multipole components to the main magnets of the SPS MADX model as a basis for the non-linear machine model that can be used for beam dynamics simulations. The implications for the operation of the SPS with the LIU beam parameters are discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR036  
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THPMR038 Non-Linear Errors in the Experimental Insertions of the LHC insertion, coupling, dipole, dynamic-aperture 3472
 
  • E.H. Maclean, F.S. Carlier, M. Giovannozzi, A. Langner, S. Mönig, T. Persson, P.K. Skowroński, R. Tomás
    CERN, Geneva, Switzerland
  
  Correction of nonlinear magnetic errors in low-β insertions can be of critical significance for the operation of a collider. This is expected to be of particular relevance to LHC Run II and the HL-LHC upgrade, as well as to future colliders such as the FCC. Current correction strategies for these accelerators have assumed it will be possible to calculate optimized local corrections through the insertions using a magnetic model of the errors. To test this assumption the nonlinear errors in the LHC experimental insertions have been examined via feed-down and amplitude detuning. It will be shown that while in some cases the magnetic measurements provide a sufficient description of the errors, in others large discrepancies exist which will require beam-based correction techniques.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR038  
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THPMR041 Implementation of High Order Symplectic Integrators with Positive Steps in Tracking Programs quadrupole, lattice, storage-ring, dipole 3484
 
  • K. Skoufaris, Y. Papaphilippou
    CERN, Geneva, Switzerland
  • J. Laskar
    IMCCE, Paris, France
  • Ch. Skokos
    University of Cape Town, Cape Town, South Africa
  
  The symplectic integrators CSABAν & CSBABν are used in order to calculate single particles dynamics in accelerators and storage rings. These integrators present only positive steps and can be accurate up to the high order. They are compared with already existing splitting methods of MAD-X with respect to their impact on various beam dynamics quantities, for different beam elements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR041  
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THPMR049 Minimization of Nonlinear Effects of Insertion Devices at SPS Storage Ring electron, wiggler, storage-ring, insertion 3515
 
  • P. Sunwong, P. Klysubun, S. Kongtawong, S. Krainara, T. Pulampong, P. Sudmuang
    SLRI, Nakhon Ratchasima, Thailand
  • T. Pulampong
    JAI, Oxford, United Kingdom
  
  Funding: Synchrotron Light Research Institute PO. Box 93 Nakhon Ratchasima 30000 Thailand
Nonlinear effects of insertion devices were studied for the Siam Photon Source (SPS) storage ring. Despite the fact that shimming technique was used to minimize the nonlinear components of magnetic field integral arising from random errors, the nonlinear dynamics effects still remain. It was found that calculated dynamic field integrals are largest in the 2.2 T Hybrid Multipole Wiggler (MPW). Dynamics effects of insertion devices are attributed to the wiggling trajectory of electron in the region of magnetic field roll-off due to finite pole width. For better and more effective operation of the SPS storage ring, multipole components of the dynamic field integral in the MPW have to be further reduced. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR049  
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THPMR053 Influence of Magnet Multipole Field Components on Beam Dynamics in the JLEIC Ion Collider Ring dynamic-aperture, ion, collider, dipole 3525
 
  • G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Nosochkov, M.-H. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
To get a luminosity level of a few 1033 cm-2ses−1 at all design points of the Jefferson Lab Electron Ion Collider (JLEIC) project, small β* values in both horizontal and vertical planes are necessary at the Interaction Point (IP) in the ion collider ring. This also means large β in the final focus area, chromaticity correction sections, etc. which sets a constraint on the field quality of magnets in large beta areas, in order to ensure a large enough dynamic aperture (DA). In this context, limiting multipole field components of magnets are surveyed to find a possible compromise between the requirements and what can be realistically achieved by a magnet manufacturer. This paper describes that work. Moreover, non-linear field dedicated correctors are also studied to provide semi-local corrections of specific multipole field components. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR053  
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THPOR013 Magnet Error Effect on Dynamic Aperture in CEPC dynamic-aperture, quadrupole, sextupole, lattice 3798
 
  • S. Bai, J. Gao, Y. Wang, D.J. Xiao
    IHEP, Beijing, People's Republic of China
  
  With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 1034 cm-2s−1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. The performance of the machine can be influenced by the existence of every kind of inaccuracies of the magnets, such as misalignment errors and field errors, multipole errors etc on. In this paper, we reported the errors that used in the CEPC beam dynamic study, and the influence on dynamic aperture of the CEPC main ring when introducing these kinds of errors.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR013  
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THPOR050 New Working Point for CERN Proton Synchrotron injection, resonance, proton, focusing 3905
 
  • F. Sperati, A. Beaumont, S.S. Gilardoni, D. Schoerling, M. Serluca, G. Sterbini
    CERN, Geneva, Switzerland
  
  The LHC High-luminosity project requests high brightness and intensity beams from the CERN Proton Synchrotron (PS). The generation of such beams is limited due to resonance effects at injection. The impact of resonances can be minimized by performing appropriate correction with dedicated magnets and by optimizing the tune working point. Currently the tune working point at injection is naturally set by the quadrupolar component generated by the one hundred combined function normal conducting magnets installed in the PS, and slightly corrected by low energy quadrupole magnets. In this paper, a study is presented exploiting the use of the available five auxiliary individually powered circuits to adjust the quadrupolar and higher-order multipole components for changing the tune integer at injection. Due to the non-linear contribution of each circuit to the magnetic field distribution a finite-element magnetic model was prepared to predict the required currents in the auxiliary coils. The magnetic model was benchmarked with magnetic measurements and then tested in the PS machine during dedicated machine development times.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR050  
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THPOW037 Simulated and Measured Magnetic Performance of a Double APPLE-II Undulator at the Canadian Light Source undulator, polarization, photon, dipole 4025
 
  • C.K. Baribeau, L.O. Dallin, J.M. Helfrich, T.M. Pedersen, M.J. Sigrist, W.A. Wurtz
    CLS, Saskatoon, Saskatchewan, Canada
  
  Assembly and shimming are underway for a double APPLE-II type elliptically polarized undulator (i.e. two magnet arrays installed side by side on a single support structure) at the Canadian Light Source. The device is planned to be installed in spring 2017. Extensive preparation was done prior to device assembly, particularly in development of a simulated annealing algorithm for magnet virtual shimming, as well as assembly procedures that minimized positional errors in the installed magnet blocks. In this paper we present measurements taken throughout the shimming process, and compare with predictions from a RADIA model where each magnet block was magnetized uniquely according to individual Helmholtz coil measurements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW037  
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