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dipole

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TUMPMP02 Magnetodynamic Formulation Resolving Eddy-Current Effects in the Yoke and the Superconductive Cable of the FAIR Dipole Magnets superconductivity, simulation, synchrotron, coupling 90
 
  • H. De Gersem, S. Koch, T. Weiland
    TEMF, Darmstadt
  Funding: This work was supported by the Gesellschaft für Schwerionenforschung (GSI), Darmstadt.

Transient 3D simulations are carried out for two types of superconductive dipole magnets. Eddy-current effects in the yoke are treated by homogenising the laminated iron composite whereas interstrand eddy-current effects are resolved by either a cable magnetization model or a cable eddy-current model. The simulations reveal the Joule losses in the magnets.

 
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WEPPP14 Advances in Matching with MAD-X. controls, sextupole, insertion, quadrupole 213
 
  • R. de Maria, F. Schmidt, P. K. Skowronski
    CERN, Geneva
  A new matching algorithm and a new matching mode have been developped for MadX in order to increase its potentialities. The new algorithm (JACOBIAN) is able to solve a generalized matching problem with an arbitrary number of variables and constraints, aiming to solve the corresponding least square problem. The new mode (USE\MACRO) allows the user to construct his own macros and expressions for the definition of the constraints. The new algorithm and the new mode where succesfully used for finding optic transitions, tunability charts and non-linear chromaticity correction. They can be used as a general tool for solving inverse problems which can be defined in MadX using all the available modules (twiss, ptc,track, survey, aperture, etc).  
 
WEA1MP02 Analysis of Measured Transverse Beam Echoes in RHIC quadrupole, octupole, betatron, emittance 234
 
  • S. Sorge, O. Boine-Frankenheim
    GSI, Darmstadt
  • W. Fischer
    BNL, Upton, Long Island, New York
  Funding: Work supported by EU design study (contract 515873-DIRACsecondary-Beams)

The transverse echo amplitudes observed in RHIC will be analysed using particle tracking codes together with different kinetic intrabeam scattering models. We discuss the different diffusion rates observed in proton and heavy ion beams.

 
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WEA3MP04 Implementation and validation of space charge and impedance kicks in the code PATRIC for studies of transverse coherent instabilities in the FAIR rings space-charge, simulation, impedance, damping 267
 
  • O. Boine-Frankenheim, V. Kornilov
    GSI, Darmstadt
  Funding: Work supported by EU design study (contract 515873 -DIRACsecondary-Beams)

Simulation studies of the transverse stability of the FAIR synchrotrons have been started. The simulation code PATRIC has been developed in order to predict coherent instability thresholds with space charge and different impedance sources. Some examples of code validation using the numerical Schottky noise and analytical stability boundaries will be discussed.

 
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WEA4IS01 Superconducting Cavity Design for the International Linear Collider simulation, damping, linear-collider, collider 271
 
  • A. C. Kabel, V. Akcelik, A. E. Candel, L. Ge, K. Ko, L. Lee, Z. Li, C.-K. Ng, E. E. Prudencio, G. L. Schussman, R. Uplenchwar, L. Xiao
    SLAC, Menlo Park, California
  The International Linear Collider (ILC) is the highest priority future accelerator project in High Energy Physics whose R&D is presently the focus of the Global Design Effort (GDE). SLAC's Advanced Computations Department (ACD) is involved in the accelerating cavity design for the ILC main linac using the advanced tools developed under the US DOE SciDAC initiative. The codes utilize higher-order finite elements for increased accuracy and are in production mode on distributed memory supercomputers at NERSC and NCCS to perform the large-scale simulations needed by the ILC cavity design. Presently the code suite includes the eigensolver Omega3P for calculating mode damping, the time-domain solver T3P for computing wakefields, and the particle tracking code Track3P for simulating multipacting and dark current. This talk will provide an overview of their applications to the baseline TDR cavity design, and the alternate Low-Loss and Ichiro designs. Numerical results on HOM damping, cavity deformations, multipacting, and trapped modes in multi-cavity structures will be presented. Design issues with the input coupler and the HOM notch filter will also be addressed.  
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WEA4IS03 2-D Electromagnetic Model of Fast-Ramping Superconducting Magnets simulation, coupling, induction, shielding 283
 
  • B. Auchmann, S. Russenschuck, R. de Maria
    CERN, Geneva
  • S. Kurz
    Robert Bosch GmbH, Frankfurt
  The simulation of pulsed superconducting magnets has gained importance at the verge of fast-ramping cyclotron projects. The ROXIE program has been devised for the design and optimization of superconducting magnets. The 2-D electromagnetic model of a fast-ramping magnet in ROXIE consists of
  1. a representation of strands by line currents,
  2. a coupling of the finite element method and the boundary element method to take into account the field contribution of the magnet yoke, as well as eddy-current effects in conductive bulk material,
  3. a model for persistent currents,
  4. a model for inter-filament coupling currents, and
  5. a model for inter-strand coupling currents in Rutherford-type cables.
We will present the coupling of all these effects in the mathematical framework of the theory of discrete electromagnetism. We will then proceed to demonstrate how the coupled approach helps to understand a pulsed magnet's behavior. Each of the above effects leaves an identifiable signature in the measured field quality and contributes to the losses. With ROXIE, we can trace measurements to their origin and make predictions based on experience and simulation. 		 
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