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SIS100 is the world's second fast ramped synchrotron using superconducting magnets. The foreseen high current operation requires a sound understanding of the field homogeneity next to a field parametrization which allows investigating if the existing inhomogeneity introduces transverse oscillations on the particle beam. The SIS100 dipole magnets ar...
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... The permeability of each charge of the used iron was measured and the lamination was sorted to equalize the magnetic properties of all yokes as good as possible. The distortion of the magnetic end fields at both sides of the yoke was optimized by a so-called Rogowski profile which was designed by simulations regarding a suppression of undesirable multipole terms [7]. The outer shell welding was established with a laser technique which is lowering the heat input and the tension on the yoke. ...
... During the R&D phase of the heavy ion synchrotron SIS100 these problems had to be tackled as the beam uses considerable area of the elliptic vacuum chamber. This led to the development of elliptic cylindric multipoles [1][2][3]. ...
... The appropriate multipoles were derived using local toroidal coordinates and the technique of R-separation, as these give simpler solutions, as the global toroidal ones (see e.g. [4,5]), and are easier to interpret [2,6]. The solution was then further extended to elliptic toroidal multipoles [7]. ...
... Any non-negative integer power is such a complex regular solution of Eqs. (2) or (3). The reference radius R Ref is inserted to render all the solutions dimensionless and of similar magnitude. ...
Recent progress in particle accelerator tracking has shown that the field
representation is one of the major limits of the prediction accuracy especially
for machines, whose aperture is fully filled by the beam and thus higher the
artefacts created by higher order modes have to be thoroughly understood. The
standard tool for field presentation today are cylindrical circular multipoles
due to their straight forward correspondence to the Cartesian coordinates. In
this paper we extend the standard approach to other coordinate systems, show
how these can be measured next to their realisation in measuring the SIS100
Magnets for the FAIR project.
For many problems an adapted coordinate system allows reducing the number of dimensions if chosen appropriately. A familiar example is the use of the polar coordinate system, which simplifies any circular problem independent of the polar angle. Here coordinate systems are presented, which are commonly known but have not been frequently applied for describing the fields of accelerator magnets.
Advanced multipole descriptions are introduced for cylindrical ellptical, toorodial circular and toroidal ellptical coordinates are presented. Their properties and their basis functions are investigated. Furthermore it is shown how these can be recalcuated to circular ones if applicable.
The Heavy Ion Synchrotron SIS100 is the core facility of the international FAIR project at GSI in Darmstadt. We present the main design aspects of the high current dipoles and quadrupoles as well as the sophisticated layout of the corrector magnets. The first dipole is already produced for intensive testing to assure the reliable start of the series production in 2014. We present the status of these tests together with the obtained operation characteristics.
The SIS100 synchrotron for heavy ion research is based on fast-ramped superconducting magnets. These super-ferric magnets are being designed, built, and tested. The first 3-m-long series dipole (maximum field of 1.9 T; ramp rate of 4 T/s) has been built. We present the test results obtained (quench training, magnetic field, ac loss, and repetition rate) and compare them with the predicted values and the required operation parameters.
The Facility for Antiproton and Ion Research is now fast approaching its realization phase. Roughly 800 superconducting magnets are required for the SIS100 and the Super-FRS machines. Given their long lead time of procurement for this large number of items, the SIS100 dipoles series is already ordered with the quadrupole modules following swiftly. The Super-FRS dipole and multiplets are being tendered. In a second realization phase the SIS300 accelerator will be built and placed in the same common tunnel as the SIS100. We report the status of magnet production of the different projects together with the experiences obtained during the manufacturing process of the first SIS100 series dipole.
The Facility for Ion and Antiproton Reseach is now procuring the first series of magnets with the other series on the tendering process. The superconducting magnets will be tested at GSI or partner institutes. The fast ramped synchrotron SIS100 uses superferric dipoles with a beam aperture of 115 mm · 60 mm and a maximum field of 1.9 T at ≈ 13 kA with a ramp rate of 4 T/s and a continuous cycle frequency of up to 1 Hz. These magnets are built on the Nuclotron cable with NbTi wire. The superconducting fragment separator magnets are superferric, with an aperture of 220 mm · 80 mm for the dipole, a pole dip field of 1.6 T, use a NbTi NMR type wire, and operation currents of ≈300 A. In addition, R&D on SIS300 main magnets proceeds for the second project phase, requiring additional test preparation for the already built prototypes. The dipole magnets are 6-T cosθ magnets using a NbTi Rutherford cable. All these magnets must be tested at cold temperatures to prove their functionality and production accuracy. Different test facilities are currently set up and the test procedures are established. We report on the testing strategy and the progress of the test preparation.
SIS100, the core machine of the FAIR project, is being realized now, with the dipole series already ordered. This machine uses fast ramped superconducting dipole magnets (4 T/s, 1 Hz operation cycle), which were optimized to reduce the ac loss and to provide adequate end fields. We present the actual status of the design optimization for the superconducting main magnets as well as of the corrector magnet units. Their series production is now launched and the testing strategy is clarified. The key issues of ac loss minimization, hydraulic resistance, and test facility built is discussed.
