Cable Design for FAIR SIS 300

Kaugerts, J.; Moritz, G.; Wilson, M.N.; Ghosh, A.; Ouden, A. den; Bogdanov, I.; Shcherbakov, P.; Shirshov, L.; Tkachenko, L.; Richter, David H.; Verweij, Arjan; Willering, Gerard; Fabbricatore, P.; Volpini, G.

doi:10.1109/tasc.2007.898474

Cited by 21 publications

(13 citation statements)

References 9 publications

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“…The core is typically made of stainless steel of the type 304 [5] or 316L [81] with a thickness of ∼ 25 µm. The electrical resistance of both types of stainless steel at T < 20 K is 5.3·10 −7 Ωm [82,83].…”

Section: Electrical Contactmentioning

confidence: 99%

“…The 13 mm wide 25 µm thick core of 304 stainless steel ensures R c > 10 mΩ, thus limiting the interstrand coupling loss and dynamic field errors in magnet applications [5]. Due to the core, the heat conductivity in the cross direction is strongly reduced and CPC I will be increased strongly.…”

Section: Sis 300 Dipole Samplesmentioning

confidence: 99%

“…• sis 300 strands are part of the design of the main dipole and quadrupole magnets of the sis 300 accelerator [5]. The main specifications are listed in table 1.2.…”

Section: Introductionmentioning

confidence: 99%

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Stability of superconducting Rutherford cables for accelerator magnets

Willering

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f c e e r g s o r a c l r a t o m a n e t Gerard Willering S t a b i l i t y o f S u p e r c o n d u c t i n g r C b l e R u t h e f o r d a s PrefaceThe work described in this thesis results from an extensive collaboration between the special chair for Industrial Application of Superconductors in the Low Temperature Division at the University of Twente and the Magnets, Superconductors and Cryostats group at CERN. The research has been carried out at CERN as well as at the University of Twente and it is funded by both institutes. Part of the cable samples were prepared by GSI in the frame of research collaboration on cable stability.I am very grateful to the members of these groups for giving me the opportunity to perform the research, for their interest and useful discussions.i ContentsPreface i Chapter 1 IntroductionAfter the discovery of superconductivity in the beginning of the 20 th century the understanding of the phenomenon has grown. Practical conductors are produced for various magnet applications. Although the number of superconducting materials is high, only a few can be used in high-field and high-current density applications. This thesis deals with cable stability, with the focus on application in accelerator magnets.In this chapter a brief overview of the existing and near future accelerators and their superconducting magnets is presented. The most recent superconducting accelerator, the lhc and the near future superconducting accelerator sis 300 are described.The phenomenon of superconductivity is shortly discussed and practical superconductors are introduced with an emphasis on strands and cables. Different types of cables are presented and the relevance of this thesis for in particular the Rutherford type of cable is discussed.The terms quench and recovery are introduced. The importance of research on stability is illustrated by the large number of training quenches in the lhc main dipole magnets. Superconducting accelerator magnetsIn High Energy Physics the interaction of elementary particles is being studied. Many particle accelerators have been constructed to accelerate particles and collide them at high energy. Synchrotron accelerators provide a circular track with RFcavities to accelerate bunches of particles each cycle.Synchrotron accelerators require dipole magnets to bend the particle beam and keep it in its circular track. Quadrupole magnets are used to focus and defocus the beam and higher-order magnets correct field distortions and chromaticity. The collision energy depends on the magnetic field in the aperture of the dipole B a (T) and the bending radius of the dipole magnets r d (km) following E ≈ 0.3B a r d (TeV). The limitation in the track circumference is strongly dictated by the amount of material and the costs involved. In normal conducting magnets iron is applied to enhance the electromagnetic field produced with copper windings. The magnetic field in iron saturates at about 2 T, therefore the needed amount of copper windings and the costs involved increase strongly for hig...

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Section: Electrical Contactmentioning

confidence: 99%

Section: Sis 300 Dipole Samplesmentioning

confidence: 99%

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Stability of superconducting Rutherford cables for accelerator magnets

Willering

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“…This study was performed to be able to choose the correct inter-strand contact of the cables for the FAIR SIS 300 high ramp rate magnets [2]. GSI prepared cored Rutherford cables with four different surface preparations in order to vary the contact resistance between adjacent strands as much as possible.…”

Section: Introductionmentioning

confidence: 99%

Stability of Nb-Ti Rutherford Cables Exhibiting Different Contact Resistances

Willering

Verweij

Kaugerts

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-Dipole magnets for the so-called SIS-300 heavy-ion synchrotron at GSI are designed to generate 6 T with a field sweep rate of 1 T/s. It is foreseen to wind the magnets with a 36 strands Nb-Ti Rutherford cable. An important issue in the cable design is sufficiently low AC loss and stability as well. In order to keep the AC loss at low level, the contact resistance between crossing strands R c is kept high by putting a stainless steel core in the cable. The contact resistance between adjacent strands R a is controlled by oxidation of the Sn-Ag coating of the strands, like in the LHC. In order to investigate the effect of R a on the stability of the cable, we prepared four samples with different R a by varying the heat treatment and applying a soldering technique, resulting in values between 1 to 9 m. The stability of each sample against transient point-like heat pulses was measured. The results of the stability experiments and a comparison with calculations using the network model CUDI are presented. It is concluded that variation of R a has a strong influence on cable stability and that optimization of R a is mandatory to properly design the cable for the SIS-300 magnets, or likewise for similar magnets that might be used at CERN for a possible LHC injector upgrade.

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“…The narrow side of the trapezoid cable with no insulation was 1.362 mm long, the wide side 1.598 mm, and the width was 15.1 mm. To ensure resistance 200 μΩ between the wires in the longitudinal direction and 20 μΩ in the transverse direction, the wire was coated with a 0.5 μm thick layer of the alloy 95% Sn + 5%Ag, and the cable was heat-treated [4]. The spacer substantially increases the stiffness of the cable, which makes it difficult to wind it onto the front parts.…”

mentioning

confidence: 99%

Development of rapid-cycling superconducting magnets and the SIS300 cryogenic accelerator system

Ageyev¹,

Bogdanov²,

Zinchenko³

et al. 2012

At Energy

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The SIS300 ion synchrotron is the last stage of the FAIR facility for antiproton and ion research. Its magnet structure is based on rapid-cycling superconducting magnets, making it possible to increase the energy and time-averaged intensity of particle beams. In 2008, the Institute of High Energy Physics (IFVE) developed and successfully tested the SIS300 model dipole, which reached a central magnetic field 6.8 T with ramping 1.15 T/sec, which is higher than that of existing analogues. At the present time, the IHEP is developing with the financial support from Rosatom prototypes of rapid-cycling quadrupole and corrector magnets for SIS300 and is developing in collaboration with the Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM) a superconducting conductor for these magnets and developing the SIS300 cryostating system, which will be built by Kriogenmash and Geliimash. The status of this work is presented.The SIS300 superconducting ion synchrotron is the last stage of the FAIR accelerator complex, where U 92+ ions are accelerated to energy 33 GeV/nucleon [1]. In the future, the synchrotron will be used as a stretching ring with the possibility of increasing the energy of U 28+ ions from 400 to 1000 MeV/nucleon with maximum intensity 1·10 12 ions/sec. As the principal magnetic structure of the synchrotron, superconducting rapid-cycling magnets make it possible to increase considerably the energy and time-averaged intensity of the accelerated ion beams.A temperature margin (minimum difference between the critical and working temperature) at 1 K in all operating regimes of the accelerator must be provided for stable operation of the superconducting rapid-cycling magnets. This is accomplished by decreasing the thermal losses and by effective cooling. The rate of change of the magnetic field in superconducting magnets of large charged-particle accelerators, for example, the Tevatron (USA), HEA (Germany, RHIC (USA), and LHC (Switzerland), with amplitude exceeding 3 T does not exceed 0.1 T/sec. Its 10-fold increase in SIS300 will increase considerably the heat losses in the winding and in the magnetic conductor. This will cause considerable heating of the superconducting winding, which will lower the temperature margin, and greatly increase the load on the cryogenic system and, as a consequence, increase the operational costs of operating the accelerator.

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Cable Design for FAIR SIS 300

Cited by 21 publications

References 9 publications

Stability of superconducting Rutherford cables for accelerator magnets

Stability of superconducting Rutherford cables for accelerator magnets

Stability of Nb-Ti Rutherford Cables Exhibiting Different Contact Resistances

Development of rapid-cycling superconducting magnets and the SIS300 cryogenic accelerator system

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