Keyword: sextupole
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MOPRO017 Low Emittance Lattice Cell with Large Dynamic Aperture emittance, lattice, dynamic-aperture, storage-ring 99
 
  • A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: The work is supported by the Ministry of Education and Science of the Russian Federation.
Compact low emittance lattice cell providing large dynamic aperture is essential for development of extremely low (pm range) emittance storage rings. As it is well known, a pair of identical sextupoles connected by a mi-nus-identity matrix transformer in ideal case of kick-like magnets provides infinite dynamic aperture. Though the finite sextupole length degrades the aperture, it is still large enough, and in this report we discuss development of the low emittance cell providing the —I condition for both horizontal and vertical chromatic sextupoles. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO017  
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MOPRO023 SuperKEKB Beam abort System kicker, quadrupole, extraction, power-supply 116
 
  • T. Mimashi, N. Iida, M. Kikuchi, T. Mori
    KEK, Ibaraki, Japan
  • K. Abe
    Hitachi Power Semiconductor Device, Ltd., Hitachishi, Ibaraki, Japan
  • A. Sasagawa
    KYOCERA Corporation, Higashiomi-city, Shiga, Japan
  • A. Tokuchi
    Pulsed Power Japan Laboratory Ltd., Kusatsu-shi Shiga, Japan
  
  The abort system of the SuperKEKB is described. The beam abort system consists of the beam abort kicker magnets, pulsed quadrupole magnets, a lambertson septum magnet and extracted window. The dumped beam is extracted with beam abort kicker through the extraction window. The pulsed quadrupole magnets make the beam spot size large at the window. The damages of the extraction window is tested with KEKB beam. The pulsed kicker power supply is under development.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO023  
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MOPRO034 Studies on Nonlinear Post-linac Protection for CLIC collimation, luminosity, linac, octupole 148
 
  • J. Resta-López
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • S.T. Boogert, J. Snuverink
    JAI, Egham, Surrey, United Kingdom
  • A. Faus-Golfe, J. Resta-López
    IFIC, Valencia, Spain
  
  The post-linac energy collimation system of CLIC is designed to fulfill an essential function of protection of the Beam Delivery System (BDS) against miss-steered beams generated by failure modes in the main linac. Guaranteeing the collimator survivability in case of direct beam impact is very challenging, if we take into account the need to deal with an unprecedented transverse beam energy density per beam of the order of GJ/mm2. This translates into a high damage potential of uncontrolled beams. In this paper we present an alternative nonlinear energy collimation system as a potential solution to guarantee the survival of the collimators. The performance and error tolerances of this system are studied by means of beam tracking simulations, and compared with those of the conventional baseline CLIC energy collimation system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO034  
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MOPRO035 Update on Nonlinear Collimation Schemes for the LHC collimation, optics, simulation, betatron 151
 
  • J. Resta-López
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A. Faus-Golfe, L. Lari, J. Resta-López
    IFIC, Valencia, Spain
  
  Funding: FP7 HL-LHC Grant Agreement 284404
In this paper we review the status of the studies on nonlinear collimation schemes for the LHC. Concretely we describe the design of a nonlinear optics for betatron cleaning in IR7. The aim is to investigate alternative nonlinear collimation systems to reduce the collimator-induced impedance that may limit the beam intensity towards the LHC luminosity upgrade. The performance of the LHC nonlinear collimation system is studied by means of tracking simulations and compared with the present LHC system. Furthermore, the advantages and possible limitations of such nonlinear collimation scheme are discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO035  
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MOPRO049 A Low Emittance Lattice Design for the Canadian Light Source quadrupole, lattice, dipole, emittance 194
 
  • L.O. Dallin, W.A. Wurtz
    CLS, Saskatoon, Saskatchewan, Canada
  
  The CLS presently has a 12 cell DBA lattice with a circumference of 170.88 m. By using conventional magnet designs an emittance of 18 nm-rad is achieved. Twelve 5 m straights are available for injection, an RF cavity and insertion devices. An emittance of 1 nm-rad (at 2.9 GeV) can be achieved replacing each DBAs with multi-bend achromats (MBAs) while preserving the 12-fold symmetry although with a reduction of the length of the straights. To achieve the strong focussing required for low emittance very strong field gradients are required in the dipoles as well as the quadrupole and sextupole magnets. Sufficient dynamic aperture for off-axis injection and Touschek lifetime may be possible.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO049  
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MOPRO053 Study of Upgrade Scenarios for the SOLEIL Storage Ring emittance, lattice, optics, dipole 203
 
  • R. Nagaoka, P. Brunelle, X.N. Gavaldà, A. Loulergue, A. Nadji, L.S. Nadolski, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette, France
  
  Within the scope of a future major upgrade of the SOLEIL storage ring, presently having the energy of 2.75 GeV, the circumference of 354 m and the horizontal emittance of 3.7 nm.rad, towards a Diffraction Limited Storage Ring (DLSR), the present paper presents and discusses the outcomes of a series of studies launched to explore different possible scenarios for the magnet lattice arrangement, under the constraint of making the upgrade in the same existing machine tunnel. Two scenarios were presented earlier in this context, which both preserved all the existing free straight sections for insertions, though the bending magnet positions were not strictly conserved. The purpose of the extended studies is to explore, in particular, the range of horizontal emittance that can be reached by hypothetically removing some of the existing geometric constraints, such as suppressing or shortening partially the straight sections. The emittance range is equally studied by fulfilling rigorously all constraints. The dependence of the nonlinear properties of the magnet lattice on the linear optics is simultaneously investigated.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO053  
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MOPRO055 ESRF Upgrade Phase II Status vacuum, lattice, storage-ring, emittance 209
 
  • J.-L. Revol, P. Berkvens, J.C. Biasci, J-F. B. Bouteille, N. Carmignani, J. Chavanne, F. Ewald, L. Farvacque, L. Goirand, M. Hahn, L. Hardy, J. Jacob, J.M. Koch, G. Le Bec, S.M. Liuzzo, T. Marchial, D. Martin, B. Nash, T.P. Perron, E. Plouviez, P. Raimondi, K.B. Scheidt, V. Serrière, R. Versteegen
    ESRF, Grenoble, France
  
  The ESRF is close to the end of the first phase (2009-2015) of its Upgrade Programme and has defined the objectives for the ensuing second phase. It envisions a major upgrade of the source to best serve the new science opportunities. The ESRF Council endorsed the proposal to perform the technical design study of a new 7-bend achromat lattice. This configuration will allow the storage ring to operate with a decrease in horizontal emittance by a factor of about 30 and a consequent increase in brilliance and coherence of the photon beam. This paper reports on the status of the accelerator project, highlighting the progress in the technical design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO055  
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MOPRO064 An Ultra-low Emittance Model for the ANKA Synchrotron Radiation Source Including Non-linear Effects emittance, lattice, quadrupole, synchrotron 228
 
  • A.I. Papash, A.-S. Müller
    KIT, Eggenstein-Leopoldshafen, Germany
  • E.B. Levichev, P.A. Piminov, S.V. Sinyatkin, K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  
  An ultra-low emittance lattice based on the ANKA ring geometry is under investigation in framework of the feasibility studies for a compact low emittance synchrotron light source at the Karlsruhe Institute of Technology (Germany). An attempt to apply the concept of split bending magnets cells and to reduce the natural emittance of the bare ANKA DBA lattice from 90 nm×rad down to 2.5 nm×rad with not-vanishing dynamic aperture is described in this paper. The TME cell with split bends and a quadrupole lens in-between as well as a pair of non-interleaved sextupole lenses separated by “—I ” unit transfer matrix of betatron oscillations allows to decrease the theoretical minimum emittance of ANKA ring down to approximately 6 nm×rad. Further reduction of the phase space volume requires to brake “—I ” symmetry and add extra families of sextupoles, locate an additional high order field elements inside the quadrupoles, optimize the phase advance between sextupole families, shift the betatron tune point, enlarge the sextupole strength and other measures. Results of simulations are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO064  
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MOPRO079 Design of Ultra-low Emittance Ring with Multi-bend Lattice on a Torus-knot lattice, emittance, quadrupole, insertion 271
 
  • A. Miyamoto, S. Sasaki
    HSRC, Higashi-Hiroshima, Japan
  
  We proposed a torus knot type synchrotron radiation ring in that the beam orbit does not close in one turn but closes after multiple turns around the ring. Currently, we are designing a new ring based on the shape of a (11, 3) torus knot for our future plan ‘HiSOR-II.’ This ring is mid-low energy light source ring with a beam energy of 700 MeV. Recently some light source rings are achieving very low emittance that reaches a diffraction limited light by adopting a multi-bend scheme to the arc section of the ring. It is not difficult for low-mid energy VUV-SX light source ring because the electron beam less than 10 nmrad can provide the diffraction limited light in the energy less than 10eV. However the multi-bend lattice has many families of the magnets, therefore it is not easy to decide the parameters of the lattice. Especially, it is difficult for the torus knot type SR ring because there is a lot of geometric limitation around the cross points of orbits. We present the details of the designing procedure and the specifications of the ultra-low emittance light source ring having innovatively odd shape.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO079  
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MOPRO089 Towards a Low Alpha Lattice for the ALBA Storage Ring lattice, quadrupole, storage-ring, operation 298
 
  • M. Carlà, G. Benedetti, Z. Martí, F. Pérez
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  Funding: CELLS-ALBA
A proposal of a low alpha lattice for the ALBA third generation light source is presented. Opposed to most of other machines, belonging to the same category, ALBA employs an optimized lattice making use of combined function dipoles. This has permitted a very compact design stripped out of all not strictly necessary quadrupoles resulting in a lack of flexibility. For such a reason the common approaches used in many other synchrotrons can not be directly applied to ALBA and a different strategy has to worked out. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO089  
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MOPRO100 Engineering Integration Constraints on the Beam Physics Optimisation of the DDBA Lattice for Diamond lattice, dipole, quadrupole, vacuum 322
 
  • R. Bartolini, M. Apollonio, C.P. Bailey, M.P. Cox, N.P. Hammond, R. Holdsworth, J. Kay, I.P.S. Martin, V.V. Smaluk, R.P. Walker
    DLS, Oxfordshire, United Kingdom
  • T. Pulampong
    JAI, Oxford, United Kingdom
  
  The design and optimisation of the new DDBA lattice for Diamond has been performed taking fully into account, from the early stages, the geometry and the engineering integration constraints. In this paper we review the evolution of the DDBA cell, the rationale for its modification and the optimisation strategy used.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO100  
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MOPRO103 The Double-double Bend Achromat (DDBA) Lattice Modification for the Diamond Storage Ring vacuum, dipole, lattice, quadrupole 331
 
  • R.P. Walker, M. Apollonio, C.P. Bailey, R. Bartolini, M.P. Cox, R.T. Fielder, N.P. Hammond, M.T. Heron, J. Kay, I.P.S. Martin, S.P. Mhaskar, G. Rehm, E.C.M. Rial, B. Singh, V.V. Smaluk, A. Thomson
    DLS, Oxfordshire, United Kingdom
  • R. Bartolini, T. Pulampong
    JAI, Oxford, United Kingdom
  
  The concept of converting individual cells of the Diamond Double Bend Achromat (DBA) lattice into a modified 4-bend achromat with a new straight section for insertion devices (IDs) in the middle of the arc, grew out of earlier studies of low emittance MBA lattices*, and was motivated by the need for additional ID straight sections, since all of the 22 ID straight sections in the Diamond storage ring are either occupied or have been allocated to future beamlines. Such a modification effectively replaces each DBA cell with two new DBA cells, hence the term Double-DBA or DDBA has come to be used for the project. Since the tangent point for bending magnet beamlines lies close to the start of the second dipole in the original DBA, this allows unused exit ports and spaces on the experimental hall which are available for future bending magnet beamlines to be used for higher performance ID beamlines. In this report we present an overview of the status of the project, the various accelerator physics and engineering studies that have been carried out, and plans for the implementation of one or two DDBA cells in Diamond.
* R. Bartolini, IPAC'13, p. 237 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO103  
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MOPRO105 Study of Ultra-low Emittance Design for SPEAR3 dipole, emittance, quadrupole, electron 337
 
  • M.-H. Wang, R.O. Hettel, X. Huang, T. Rabedeau, J.A. Safranek, K. Tian
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the US Department of Energy under contract number: DE-AC02-76SF00515
Since its 2003 construction, the SPEAR3 synchrotron light source at SLAC has continuously improved its performance by raising beam current, top-off injection, small alpha and smaller emittance. This makes SPEAR3 one of the most productive light sources in the world. Now to further enhance the operation of SPEAR3, we are looking into the possibility of converting SPEAR3 to a multi-bend achromat storage ring within its site constraint. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO105  
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MOPME021 Vicky: Computer Code Update quadrupole, optics, multipole, undulator 421
 
  • F. Iazzourene
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  Vicky is a computer code for designing and simulating charged particle accelerators*. We recall mainly that Vicky is a very user friendly code, the particle motion is described by 10 parameters: four beta-functions, four alpha-functions and two phase advances, and a large variety of insertion devices, wigglers and undulators, linearly and elliptically polarized, are treated. The features include Twiss functions matching, orbit correction, tune and chromaticity adjustment, dynamic aperture and phase space tracking. The paper describes new aspects and the present status.
* F. IAZZOURENE, “Vicky: A Computer Code for Use in the Design and Simulation of Particle Accelerators”, proceedings IPAC 2011. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME021  
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MOPRI091 Resonant Slow Extraction in Synchrotrons by Using Anti-symmetric Sextupole Fields resonance, extraction, simulation, synchrotron 827
 
  • Y. Zou, J.Y. Tang
    IHEP, Beijing, People's Republic of China
  
  This paper proposes a novel method for non-resonant slow extraction by using special anti-symmetric sextupole field in synchrotrons. The method has the potential in applications asking for stable slow extraction and in the halo collimation of very large machine such as LHC. Our studies show that the slow extraction by using anti-symmetric sextupole field has some advantages compared to the normal sextupole field which is the normal extraction method. One of them is that it can work at almost arbitrary tune, so that it can avoid the problem of the intensity variation caused by the ripples of magnet supplies. Studies by Hamiltonian theory and simulations which meet well show that the stable region only depends on the anti-symmetric sextupole field strength and the particles outside will be driven out in two directions which are similar to the second-order resonant extraction but with spiral steps as in the third-order resonance extraction. The beam can be extracted with a very stable intensity by gradually increasing the field strength. The multi-particle simulations by a self-made program have been carried out with a proton lattice designed for proton therapy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI091  
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MOPRI094 Proposal for a Slow Extraction System for a Biomedical Research Facility at CERN based on LEIR extraction, emittance, resonance, quadrupole 833
 
  • A. Garonna, D. Abler, C. Carli
    CERN, Geneva, Switzerland
  
  Funding: This work was partly funded by the Marie Curie Initial Training Network Fellowship of the European Community’s Seventh Framework Programme under contract number PITN-GA-2008-215840-PARTNER.
A proposal has been made to accelerate ion beams ranging from hydrogen to neon with magnetic rigidities up to 6.7 Tm for biomedical experiments at CERN using the Low Energy Ion Ring (LEIR), in parallel to its continued operation for LHC and for SPS fixed target physics experiments. The feasibility of a new slow extraction system for LEIR based on the third integer resonance was studied with two possible resonance driving mechanisms: quadrupole-driven extraction and RF-knockout extraction. The extraction of fully stripped carbon ions (20-440 MeV/u kinetic energies) has been studied in detail. The requirement to keep the present performance of the machine for physics experiments imposes tight space constraints for the upgrade. The extraction scheme and the hardware requirements are described in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI094  
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TUOAB02 Design Study of the SuperKEKB Interaction Region Optics octupole, quadrupole, dynamic-aperture, simulation 950
 
  • H. Sugimoto, H. Koiso, A. Morita, Y. Ohnishi, K. Oide
    KEK, Ibaraki, Japan
  
  SuperKEKB is an upgrade project of KEKB e+e− ring collider and is aimed to open up a new luminosity frontier. The target peak luminosity is 8x1035 cm-2 s-1. In order to achieve this target, a nano-beam scheme is adopted, in which colliding beams are squeezed to nano-scale sizes in the vertical direction at the interaction point (IP). The interaction region (IR) is an essential part of the SuperKEKB lattice design since the large chromaticity originated in the final focusing system (QCS) and strong lattice nonlinear forces make the particle motion unstable. An optics with detailed hardware specifications has been designed to optimize a performance of the beam dynamics. Design studies of IR taking into account a possible QCS imperfection are reported in this paper.  
slides icon Slides TUOAB02 [9.899 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAB02  
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TUPRO035 Vertical Emittance at the Quantum Limit emittance, quadrupole, storage-ring, coupling 1096
 
  • R.T. Dowd, Y.E. Tan
    SLSA, Clayton, Australia
  • K.P. Wootton
    The University of Melbourne, Melbourne, Victoria, Australia
  
  Further reduction of betatron coupling and vertical dispersion in the storage ring of the Australian Synchrotron Light Source has resulted in the achievement of a beam vertical emittance that is now dominated by the intrinsic quantum effects. This paper will detail the key elements in achieving a vertical emittance at the quantum limit and results achieved.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO035  
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TUPRO060 First Turn-by-turn Measurements for Beam Dynamics Studies at ALBA kicker, injection, optics, electron 1171
 
  • Z. Martí, G. Benedetti, M. Carlà, A. Olmos
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  This paper summarizes the tasks carried out to develop a turn-by-turn (TBT) measurement system at ALBA. These tasks mainly include testing the MAF firmware for the libera BPMs and implementing the necessary analytical tools to infer the beam dynamics parameters. TBT measurements using an injection kicker are presented. Linear and non-linear beam dynamics results are compared with LOCO. Results are still preliminary since a good agreement with the linear model has not been achieved yet.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO060  
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TUPRO063 Upgrade of Slicing and Tracking in MAD-X quadrupole, dipole, lattice, optics 1180
 
  • H. Burkhardt, L. Deniau, A. Latina
    CERN, Geneva, Switzerland
  
  We describe the extension of the functionality of the slicing module and its applications in MAD-X. We can now select thick or thin slicing for individual quadrupoles or groups of quadrupoles and implemented tracking of thick quadrupoles and dipoles in MAD-X. Complex dipole magnets with fringe fields can now automatically be translated to simple bends with extra dipedges.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO063  
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TUPRO069 First Studies of Two-beam Tuning in the CLIC BDS luminosity, collider, linear-collider, simulation 1195
 
  • J. Snuverink
    JAI, Egham, Surrey, United Kingdom
  • A. Latina, R. Tomás
    CERN, Geneva, Switzerland
  
  Beam tuning in the beam delivery system (BDS) is one of the major challenges for the future linear colliders. Up to now single beam tuning has been performed, both in simulations and experiments at the Accelerator Test Facility (ATF). However, in future linear colliders, due to fast detuning of the final focus optics both beamlines will need to be tuned simultaneously. In this paper a first two-beam tuning study for the Compact Linear Collider (CLIC) BDS is presented applying the usual toolbox of beam-based alignment (BBA) and sextupole knobs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO069  
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TUPRO081 Mechanical and Magnetic Performance of Compact Synchrotron Magnet Systems for MAXIV and SOLARIS dipole, multipole, quadrupole, octupole 1229
 
  • F. Bødker, L.O. Baandrup, C.E. Hansen, D. Kristoffersen, C.W. Ostenfeld, C.G. Pedersen
    Danfysik A/S, Taastrup, Denmark
  
  Compact magnet systems for ultra-low emittance synchrotron light sources have been developed at MAXLab*. Results of the production and test at Danfysik of 60 magnet systems for the MAXIV 3 GeV storage ring will be presented. These systems, contain a combined function dipole and up to 12 discrete multipoles integrated into up to 3.3 m long yokes. The production concept and test system has been reported** so here we focus on long term stability and trends of the magnetic performance of individual magnets. A complete series of 12 magnet girders for both the MAXIV 1.5 GeV and the SOLARIS storage rings are also to be produced at Danfysik. With two combined function dipoles and 11 multipole magnets integrated into 4.5 m long iron yokes these magnet systems are significantly larger. The ±0.02 mm mechanical tolerance requirement is a significant challenge but is possible with special attention to the minimization of tolerance build-up effects on the inserted multipole magnets by functional machining. New aspects of the magnetic test concept resulting from multipoles placed deep inside the girder structure will be described together with results from test of the first prototype unit.
* S.C. Leemann et al., IPAC 2001, p. 2618.
** F. Bødker et al., IPAC 2013, p. 34.
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO081  
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TUPRO086 Iranian Light Source Facility Storage Ring Low Field Magnets quadrupole, dipole, storage-ring, simulation 1241
 
  • F. Saeidi, J. Dehghani, J. Rahighi, M. Razazian, A. Shahveh
    ILSF, Tehran, Iran
  • H. Ghasem
    IPM, Tehran, Iran
  • R. Pourimani, F. Saeidi
    Arak University, Arak, Iran
  
  Iranian Light Source Facility (ILSF) is a 3 GeV Synchrotron light source with the circumference of 489.6 m. Using locally available material and the emittance of less than 1 nm-rad are two main points of the ILSF storage ring lattice, consisting of 56 low field pure bending magnets, 252 quadrupoles and 196 sextupoles with additional coils for the correctors and skew quadrupoles. The physical designs of these magnets have been performed relying on two dimensional codes POISSON [1] and FEMM [2]. Three dimensional RADIA [3] was practiced too, to audit chamfering values.
Farhad. Saeidi@Ipm.ir 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO086  
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TUPRO088 ILSF Booster Magnets for the High Field Lattice quadrupole, booster, dipole, multipole 1244
 
  • S. Fatehi, H. Ghasem
    IPM, Tehran, Iran
  
  Iranian light source facility is a 3 GeV storage ring. There are currently two choices for the lattice; high field and low field lattices. In this paper magnet design of the high field booster ring is discussed. High field booster ring is supposed to work at injection energy of 150KeV and guide the electrons to the ring energy 3GeV. It consist of 48 combined bending magnet in 1 type and 92 quadrupole in 6 families .Using two dimensional codes POISSON and FEMM, a pole and yoke geometry was designed, also cooling and electrical calculations have been done and mechanical drawings were sketched
samira.fatehi@ipm.ir 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO088  
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TUPRO090 Special Elettra Corrector Magnets dipole, controls, vacuum, power-supply 1247
 
  • E. Karantzoulis, D. Castronovo, S. Krecic, G.L. Loda
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  To fully control the beam position source point for the dipole beam lines additional correctors are needed. The space available however is minimal and no alternative solution (e.g. additional coils on quadrupoles or sextupoles) is possible making the design of such a magnet very challenging. The design, installation and performance of those special magnets is presented and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO090  
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TUPRO094 Magnetic Field Evaluation of Multipole Permanent Magnets by Harmonic Coil with Novel Calibration Technique permanent-magnet, multipole, focusing, neutron 1259
 
  • R. Kitahara, Y. Fuwa, Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  
  Quadrupole magnets for ILC final focus should be strong enough with the restriction on the external radius to let the disrupted out-going beam pass by, while vibration of the magnetic center has to be highly avoided to keep the nm sized beam focusing stable at the interaction point a few meter downstream from the lens. Gluckstern's 5-ring PMQ singlet seems a good candidate for this point of view. In order to fabricate a good 5-ring singlet, property of each ring has to be good enough. A harmonic coil system, which has 24-bit ADC’s for high resolution, was developed. Current noise level of the system is less than 10-5, which is supposed to be improved by reducing mechanical vibration of the ball bearings. We demonstrated the evaluation method of coil wire position with magnetic field from pin point magnet, so that the accuracy of the method was comparable to um scale. We measured the prototype 5-ring PMQ singlet and evaluated harmonic components. This result was compared with the data measured at KEK.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO094  
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TUPRO097 Magnets and Magnetic Field Measurements of Hefei Light Source II dipole, quadrupole, storage-ring, injection 1268
 
  • Q. Luo, N. Chen, G. Feng, N. Hu, K. Tang, Y.L. Yang, J.J. Zheng
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Work supported by Natural Science Foundation of China 11005106, 11105141, and 11375178.
The paper introduces magnets and magnetic field measurements of Hefei Light Source II. In the year 2012-2014, NSRL of USTC upgraded the HLS to HLS II. The HLS II, which was built to improve the performance of the light source, in particular to get higher brilliance of synchrotron radiation and increase the number of straight section insertion devices, is now at commissioning stage. Main purpose of this stage is to achieve full energy with high current, fine emittance and enough life time based on adjustment of magnet current, RF voltage and so on. Most of the magnets were replaced during this project. A new magnetic field measurement platform was built and used for the sampling test on new magnets. Test results showed that the discreteness and uniformity of integrated magnetic field of magnets all meet the requirements. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO097  
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TUPRO105 Design of the Main Magnets of the SESAME Storage Ring quadrupole, dipole, storage-ring, simulation 1292
 
  • A. Milanese
    CERN, Geneva, Switzerland
  • E. Huttel, M.M. Shehab
    SESAME, Allan, Jordan
  
  Funding: This work is partially supported by the EC under the CESSAMag project, FP7 contract 338602.
The lattice of the SESAME storage ring includes 16 combined function dipoles, 32 focusing quadrupoles, 32 defocusing quadrupoles, 32 focusing sextupoles and 32 defocusing sextupoles. Vertical / horizontal dipoles and skew quadrupole correctors are embedded in each sextupole. This paper summarizes the magnetic design and gives the parameters for all these magnets. The pole tip profile is commented and results of simulations are presented. At the end, the status of the procurement in the industry and collaborating institutes is presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO105  
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TUPRO111 Summary of Field Quality of TPS Lattice Magnets multipole, quadrupole, dipole, lattice 1310
 
  • J.C. Jan, C.-H. Chang, Y.L. Chu, T.Y. Chung, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, Y.T. Yu
    NSRRC, Hsinchu, Taiwan
  
  A modern 3-GeV synchrotron radiation light source is under construction in NSRRC, named Taiwan Photon Source (TPS). Great quality of magnets is required to control the electron-beam in the required orbit in the storage ring (SR) and the booster ring (BR) of TPS. The mechanical and magnet field performance of these magnets were fully inspected in NSRRC. The standard deviation of the integral field strength of 48 SR-dipole magnets is better than 0.1%. The integral multipoles and offsets of the magnetic center of the 240 SR quadrupole and 168 SR sextupole magnets conform to strict specifications. The field characteristics of the BR combined-function dipole magnet were analyzed with an average of processing raw data. The standard deviation of the field strength of 54 BR dipole-magnets is better than 0.2%. The field quality of 36 BR pure quadrupole and 48 BR combined-function quadrupole magnets are accepted to meet the requirement of the booster ring. The field strength and multipole errors of 24 BR sextupole magnets were also examined. The detailed magnetic performance and technical issues of lattice magnets are discussed in this report.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO111  
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TUPRO114 Magnet Design for the Diamond DDBA Lattice Upgrade dipole, quadrupole, multipole, alignment 1319
 
  • R. Bartolini, C.P. Bailey, N.P. Hammond, R. Holdsworth, J. Kay, S.P. Mhaskar, E.C.M. Rial, R.P. Walker
    DLS, Oxfordshire, United Kingdom
  • T. Pulampong
    JAI, Oxford, United Kingdom
  
  The DDBA lattice upgrade for Diamond presents challenging requirements on the magnet system in order to satisfy the tight constraints on the beam optics. Advanced, combined function gradient dipoles and high gradient quadrupoles are needed. We present the tolerance specification, the design solutions and the measurement and alignment strategies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO114  
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TUPME004 Lowering the CLIC IP Horizontal Beta Function luminosity, photon, synchrotron, radiation 1340
 
  • H. Garcia, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • H. Garcia
    UPC, Barcelona, Spain
  
  In order to alleviate the beamstrahlung photon emission, the beams at the CLIC Interaction Point must be flat. We propose to explore this limit reducing the horizontal beta function for CLIC at 500 GeV c.o.m. energy to half of its nominal value. This could increase the photon emission but it also increases luminosity and might allow reducing the bunch charge keeping the same luminosity. This configuration can also be considered for lower energies where beamstrahlung is less critical.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME004  
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TUPME005 CLIC FFS Lattice Proposals Combining Local and Non-local Chromaticity Corrections lattice, collider, linear-collider, interaction-region 1343
 
  • O.R. Blanco-García, P. Bambade
    LAL, Orsay, France
  • R. Tomás
    CERN, Geneva, Switzerland
  
  The requirements on the Final Focusing System (FFS) for a new linear collider has lead to lattice designs where chromaticity is corrected either locally or non-locally. Here, alternative proposals of lattice design are presented for the current CLIC 500GeV beam parameters, combining the local chromaticity correction on the vertical plane and non-local correction on the horizontal. The tight tolerance on phase advances and beta functions imposed to obtain -I transformation required to cancel the chromatic terms is relaxed by enlarging the system length and using a more general transformation definition, aiming to obtain better results in tuning simulations.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME005  
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TUPME025 Progress on Low Emittance Tuning for the CLIC Damping Rings quadrupole, emittance, coupling, dipole 1404
 
  • J. Alabau-Gonzalvo, H. Bartosik, Y. Papaphilippou
    CERN, Geneva, Switzerland
  
  In the frame of the CLIC main Damping Ring a study on the sensitivity of the lattice to different sources of misalignment is presented. The minimum equilibrium emittance is simulated and analytically estimated under dipole and quadrupole rolls, and quadrupole and sextupole vertical offsets. The result of this study establishes alignment tolerances to preserve the vertical emittance below the design value (1 pm·rad). Non-linear dynamics studies have been done to determine the dynamic aperture in the presence of misalignments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME025  
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WEZA01 Towards an International Linear Collider: Experiments at ATF2 emittance, optics, quadrupole, feedback 1867
 
  • K. Kubo
    KEK, Ibaraki, Japan
  
  For linear colliders, realizing extremely small and stable beam is essentially important. At ILC (International Linear Collider), designed vertical beam size and required position stability at the interaction point is nanometer level. In ATF (Accelerator Test Facility) at KEK, study of the final focus system has been performed using small emittance beams extracted from the damping ring. The project is called ATF2. The ATF2 beam line is designed as a prototype of the final focus system of ILC, with basically the same optics, similar beam energy spread, natural chromaticity and tolerances of magnetic field errors. Its design, construction and operation have been performed as an international collaboration. We have demonstrated the local chromatic correction method, which will be used in ILC, and observed the vertical beam size about 55 nm. Test and demonstration of intra-pulse orbit feedback has been successfully performed in the middle of the ATF2 beam line. For demonstration of nm level stable beam, high resolution beam position monitors were installed around the focal point. Here, we report our achievement, status and future plans.  
slides icon Slides WEZA01 [1.453 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEZA01  
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WEPRO009 A New Booster Synchrotron for the Sirius Project booster, injection, lattice, emittance 1959
 
  • L. Liu, X.R. Resende, A.R.D. Rodrigues, F. H. de Sá
    LNLS, Campinas, Brazil
  
  The design for the Sirius full energy booster has been modified after the decision to change the storage ring lattice from TBA to 5BA in July 2012. In the new design the booster is concentric with the storage ring and shares the same tunnel. The achieved emittance of 3.7 nm.rad at 3 GeV for this large booster (496.8 m circumference) is better matched to the 5BA storage ring emittance of 0.28 nm.rad. Good nonlinear behaviour and efficient closed orbit correction in the presence of realistic errors are shown. Injection and extraction schemes and eddy current effects during ramping are also discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO009  
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WEPRI084 Magnetic Field Optimization of SIS100 Quadrupole Units quadrupole, multipole, simulation, dipole 2684
 
  • K. Sugita, E.S. Fischer, A. Mierau, P. Schnizer
    GSI, Darmstadt, Germany
  • P.G. Akishin
    JINR, Dubna, Moscow Region, Russia
  
  Superconducting heavy ion synchrotron SIS100 is the central accelerator of the FAIR accelerator complex. There are more than 10 types of the quadrupole units in SIS100 due to the combination of the quadrupoles from 3 families and several types of the corrector magnets. Magnetic field optimization of the quadrupole magnet ends including evaluation of cross talk between closely attached quadrupole and corrector magnets will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI084  
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WEPRI101 Iron Shims outside the Helium Vessel to Adjust Field Quality at High Fields dipole, operation, insertion, quadrupole 2734
 
  • R.C. Gupta, M. Anerella, J.P. Cozzolino, A.K. Jain, J.F. Muratore, P. Wanderer
    BNL, Upton, Long Island, New York, USA
  
  Funding: This work is supported by the U.S. Department of Energy under Contract No. DE¬AC02-98CH10886.
This paper describes the development and demonstration of a novel technique of adjusting measured field quality at the design field in superconducting magnets. The technique is based on placing iron shims of variable stack thicknesses, variable width and/or variable length on the outer surface of the stainless steel shell at strategic locations. Since the shims are placed outside the helium vessel, adjustments can be made without involving major operations such as opening the helium vessel. It is a simple and economical technique which is suitable for long magnets with a fast turn-around. This allows one to reduce field errors well beyond the normal construction errors. The technique has recently been successfully applied in two 3.8 T, 80 mm aperture, 9.45 m long dipoles. These magnets were built at Brookhaven National Laboratory (BNL) for the APUL project (Accelerator Project to Upgrade the LHC) as a part of US contribution to LHC. The paper will present the design, measurement and adaptation of this technique which, when used in combination with the coil shims, produced near zero sextupole harmonic at high fields and small harmonics throughout the range of operation. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI101  
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THPRO062 Spin Tune Decoherence in Multipole Fields multipole, betatron, quadrupole, synchrotron 3017
 
  • Y. Senichev, A.N. Ivanov, A. Lehrach, R. Maier, D. Zyuzin
    FZJ, Jülich, Germany
  • S.N. Andrianov
    St. Petersburg State University, St. Petersburg, Russia
  
  This article analyzes possible limitations in the method to search for the electric dipole moment (EDM) using polarized particles in a storage ring. It is well known that for detection of the electric dipole moment one needs to create such conditions where the particle's spin oscillations can be caused only by the EDM. Really, there are two possible methods for EDM search using a storage ring: resonant spin buildup in a magnetostatic ring and “frozen” spin method in an electrostatic ring with “magic” energy. Both methods have common limitations caused by spin decoherence. In the frame of self consistent theory the reasons of the spin decoherence are classified independently on method and discussed taking into consideration multipole components of external fields, as well as the nonlinearities of RF fields.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO062  
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THPRO068 Multipoles and Alignment Error Limits for the SESAME Storage Ring Magnets dynamic-aperture, multipole, resonance, dipole 3035
 
  • M. Attal, E. Huttel
    SESAME, Allan, Jordan
  
  SESAME storage ring magnets are being constructed through the CESSAMag project in the frame of SESAME - CERN/EU collaboration. The impact of multipole and alignment errors of these magnets on machine performance have been investigated using different tracking codes. The tolerance of both systematic and random errors are defined. This article reports on the investigation results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO068  
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THPRO075 High-chromaticity Optics for the MAX IV 1.5 GeV Storage Ring optics, storage-ring, lattice, dynamic-aperture 3053
 
  • T. Olsson, S.C. Leemann
    MAX-lab, Lund, Sweden
  
  The MAX IV facility currently under construction in Lund, Sweden will include a 1.5 GeV storage ring. To prevent head-tail instability, the negative natural chromaticities of the MAX IV 1.5 GeV storage ring have been corrected to positive values using sextupole gradients in the focusing quadrupoles along with dedicated sextupole magnets. To allow adjustment of the chromaticity correction, weak correction sextupoles have been inserted into the lattice. A high-chromaticity optics has been developed for the MAX IV 1.5 GeV storage ring in case instability issues arise during commissioning. Two chromatic sextupole families were used to correct the linear chromaticity. The tune footprint was then tailored using the remaining two sextupole families with the goal of maximizing dynamic aperture and Touschek lifetime. This paper describes the recently developed high-chromaticity optics for the MAX IV 1.5 GeV storage ring and discusses performance limitations of the optics constrained by available gradient strength in the sextupoles.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO075  
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THPRI001 Design of a High Luminosity Tau/Charm Factory luminosity, emittance, injection, dipole 3757
 
  • M.E. Biagini, R. Boni, M. Boscolo, A. Chiarucci, R. Cimino, A. Clozza, E. Di Pasquale, A. Drago, S. Guiducci, C. Ligi, G. Mazzitelli, R. Ricci, C. Sanelli, M. Serio, A. Stella, S. Tomassini
    INFN/LNF, Frascati (Roma), Italy
  • S. Bini, F. Cioeta, D. Cittadino, M. D'Agostino, M. Del Franco, A. Delle Piane, G. Frascadore, R. Gargana, S. Gazzana, S. Incremona, A. Michelotti, L. Sabbatini
    Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
  • N. Carmignani, S.M. Liuzzo, P. Raimondi
    ESRF, Grenoble, France
  • R. Petronzio
    Università di Roma II Tor Vergata, Roma, Italy
  • M.T.F. Pivi
    IMS Nanofabrication AG, Vienna, Austria
  • G. Schillaci, M. Sedita
    INFN/LNS, Catania, Italy
  
  The design of a high luminosity Tau/Charm Factory has been accomplished by the INFN-LNF Laboratory in Frascati in collaboration with the Consortium Nicola Cabibbo Laboratory. The target luminosity is 1035 cm-2 ses−1 at 4.6 GeV in the center of mass. This design is a natural evolution of the SuperB B-Factory, that was aimed to be built in the Rome Tor Vergata University campus as an Italian Flagship Project. The Tau/Charm design keeps all the features that made SuperB a state-of-the art accelerator, such as the “large Piwinski angle and crab waist sextupoles” collision scheme, the super squeezed beams, and the polarized electron beam. As a plus, it will be possible to collect data at high luminosity in a large energy range (2 to 4.6 GeV c. m.), with a peak luminosity target of 1034 cm-2 ses−1 at 2 GeV. The possibility to extend the Linac for a SASE-FEL facility is also taken into account. A Conceptual Design Report* was published in September 2013. In this paper the design principles and the project features are reviewed.
* Tau/Charm Factory Accelerator Report, INFN Report INFN-13-13/LNF, September 2013, arXiv:1310.6944 [physics.acc-ph] 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI001  
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THPRI006 Dynamic Aperture Study of SuperKEKB with Beam-beam Effect dynamic-aperture, beam-beam-effects, quadrupole, lattice 3773
 
  • A. Morita, H. Koiso, Y. Ohnishi, K. Oide, H. Sugimoto
    KEK, Ibaraki, Japan
  
  The SuperKEKB is an asymmetric-energy double-ring collider to achieve 40 times higher luminosity than that of the KEKB B-factory. The strong non-linearity of both final focusing and beam-beam force, which are required to achieve such high luminosity, reduce dynamic aperture and limit Touschek beam lifetime. In order to achieve long enough beam lifetime for collision operation, we are studying the dynamic aperture under beam-beam effect. The study results of both dynamic aperture and Touschek beam lifetime are reported in this presentation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI006  
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THPRI007 Lattice Optimization of BEPCII Collider Rings lattice, luminosity, simulation, collider 3776
 
  • Y. Zhang, Q. Qin, C.H. Yu
    IHEP, Beijing, People's Republic of China
  
  BEPCII is a double ring e+e− collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·1032 cm-2s-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI007  
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THPRI010 FCC-ee Final Focus with Chromaticity Correction dynamic-aperture, optics, collider, lattice 3782
 
  • H. Garcia, R. Tomás, R. Tomás
    CERN, Geneva, Switzerland
  
  A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI010  
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