Keyword: octupole
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MOPRO034 Studies on Nonlinear Post-linac Protection for CLIC sextupole, collimation, luminosity, linac 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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MOPRI116 Beam Flattening System based on Non-linear Optics for High Power Spallation Neutron Target at J-PARC target, optics, neutron, proton 896
 
  • S.I. Meigo, A. Akutsu, K.I. Ikezaki, M. Ooi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • H. Fujimori
    KEK/JAEA, Ibaraki-Ken, Japan
 
  In the Japanese Spallation Neutron Source (JSNS) of J-PARC, a mercury is utilized as a target material. Since a serious pitting erosion was found at the target vessel at SNS in ORNL and JSNS, a reduction of a peak current density is required. In order to decrease the peak, we have developed the beam optics based on a non linear using an octupole magnets. In a design calculation, it is found that the peak current density of 30 % can be reduced by introducing the octupole magnets. A status of the design and the experimental results will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI116  
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TUOAB02 Design Study of the SuperKEKB Interaction Region Optics sextupole, 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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TUPRO081 Mechanical and Magnetic Performance of Compact Synchrotron Magnet Systems for MAXIV and SOLARIS dipole, multipole, quadrupole, sextupole 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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WEPRI086 Three Dimensional Field Analysis for Final Focus Magnet System at SuperKEKB solenoid, detector, quadrupole, multipole 2690
 
  • Y. Arimoto, N. Ohuchi, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong
    KEK, Ibaraki, Japan
  • B. Parker, P. Wanderer
    BNL, Upton, Long Island, New York, USA
 
  SuperKEKB is an upgrade accelerator of KEKB with a design luminosity of 8x1035 cm-2 s-1. The design is based on a "nano-beam scheme", where vertical beam size is squeezed into 50 nm at an interaction point. One of key component is a final focus magnet system. The focusing system consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. They are aligned in a detector (Belle-II) solenoid which generates a longitudinal field of 1.5 T. The system are packed in a small area and also has magnetic shields. So it is expected an entire magnetic field of the system is not one which is linearly-superimposed field of each magnet. Here a study of three dimensional field analysis for the final focus magnet system will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI086  
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