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| WEPKF061 |
Study of Electrical Steel Magnetic Properties for Fast Cycling Magnets of SIS100 and SIS300 Rings
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1741 |
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- I. Bogdanov, S. Kozub, A. Shcherbakov, L. Tkachenko
IHEP Protvino, Protvino, Moscow Region
- E. Fischer, F. Klos, G. Moritz, C. Muehle
GSI, Darmstadt
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The operation conditions of yoke steels in superconducting magnets of the SIS100 and SIS300 are at 4.2 K and unipolar cycles with high magnetic induction. The results of measurements of different classes of electrical steels, both isotropic and anisotropic, in the operating conditions of superconducting dipoles are presented. The measurements are carried out on ring samples in quasistatic mode. Dependence of B(H) as well as values of Hc and hysteresis losses in bipolar and unipolar cycles are determined from hysteresis loops at different temperatures. The anisotropy of steels is measured at room temperature on the strip samples, cut along the rolling direction and across one. The comparison of results on ring and strip samples is carried out. The results of calculations of hysteresis and eddy current losses in iron yoke of fast-cycling dipole for the SIS300 are presented. The recommendations on choice of grade steels for fast cycle superconducting magnets are given.
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| WEPKF062 |
Study of the Quench Process in Fast-cycling Dipole for the SIS300 Ring
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1744 |
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- I. Bogdanov, S. Kozub, A. Shcherbakov, L. Tkachenko, S. Zintchenko, V. Zubko
IHEP Protvino, Protvino, Moscow Region
- J. Kaugerts, G. Moritz
GSI, Darmstadt
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The results of numerical quench process simulation in the coil of superconducting dipole with magnetic field of 6 T and 100-mm aperture for high-energy ion and proton synchrotron facility SIS300 are presented. The peculiarities of quench process developed in dipole are discussed for several variants of quench conditions. The coil quench behavior determines the features, scopes, and limitations in possible quench protection scheme. Main design characteristics of the preferable protection system are considered.
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| WEPKF063 |
Comparison of Three Designs of Wide Aperture Dipole for SIS300 Ring
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1747 |
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- L. Tkachenko, I. Bogdanov, S. Kozub, A. Shcherbakov, I. Slabodchikov, V. Sytnik, V. Zubko
IHEP Protvino, Protvino, Moscow Region
- J. Kaugerts, G. Moritz
GSI, Darmstadt
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The GSI Fast-Pulsed Synchrotron Project is found now under development. The last stage of this machine is the SIS300 ring, which will use superconducting dipoles with 100-mm aperture, 6-T magnetic field amplitude and 1-T/s field ramp rate. This dipole has to posses minimal heat losses both in the coil and in the iron yoke. This article considers three designs of such dipole. The main distinction of these designs is the different thickness of stainless steel collars, which are supported the coil. The collars in the first design hold all forces arisen in the magnet. The second design needs collars only for assembly of the coil and cooling down of the magnet. An iron yoke in this design will withstand ponderomotive forces. The third design has no collars and the iron yoke will hold all forces, including preload, forces originated during cooling down and ponderomotive forces. The different mechanical, magnetic and thermal characteristics are presented and comparative analysis of these designs is carried out.
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| WEPKF064 |
Methods for Reducing Cable Losses in Fast-Cycling Dipoles for the SIS300 Ring
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1750 |
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- L. Tkachenko, I. Bogdanov, S. Kozub, A. Shcherbakov, I. Slabodchikov, V. Zubko
IHEP Protvino, Protvino, Moscow Region
- G. Moritz
GSI, Darmstadt
- V. Sytnikov
RCSRDI, Moscow
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A new synchrotron facility is being designed for the acceleration of high intensity and high-energy ion and proton beams at GSI, Darmstadt. The main magnetic elements of the second stage (SIS300) are superconducting dipoles with 100 mm aperture, 6-T magnetic field amplitude, and 1 T/s field ramp rate. The main requirements for these magnets, in addition to high field quality, are minimal heat losses, both in the coil and in the iron yoke, at an acceptable temperature margin. An increase of the temperature margin can be achieved by increasing the volume of superconductor in the cable. However, increasing the number of strands in the cable results in a growth of the cable width. Since coupling losses in the cable are proportional to the fourth power of cable width, these losses rise dramatically. This presentation considers and analyses different ways of reducing these cable heat losses. The calculated results of heat losses for different geometries, based on various cable designs, as well as the parameters of optimal cable designs, based on computer simulations, are presented.
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| WEPKF065 |
Study of Thermal Stability and Quench Process of HTS Dipole
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1753 |
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- V. Zubko, I. Bogdanov, S. Kozub, A. Shcherbakov, L. Tkachenko
IHEP Protvino, Protvino, Moscow Region
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The dipole with a coil made from HTS composite on a Bi2223 basis and placed in the ferromagnetic yoke has been developed and produced in IHEP. A designed magnetic field of the dipole in 20-mm aperture is 1 T at temperature of liquid nitrogen. The numerical analysis of factors, having influence on thermal stability of the magnet, as well as the computer simulations of dipole heating during quench was carried out. An anisotropy of voltage-current characteristics of HTS tapes in a magnetic field is taken into account in calculations of quench process. The measured results of voltage-current characteristics during powering and quench of the coil are in a good agreement with the numerical calculations
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| WEPKF066 |
Stability of Fast-cycling Dipole for SIS300 Ring
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1756 |
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- V. Zubko, I. Bogdanov, S. Kozub, A. Shcherbakov, L. Tkachenko, S. Zintchenko
IHEP Protvino, Protvino, Moscow Region
- M. Kauschke, G. Moritz
GSI, Darmstadt
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Funding AgencyShould not exceed 200 charactersFootnotesFootnotes: Not exceeding 200 chaThe main requirement to the superconducting dipole with 100-mm aperture, 6-T magnetic field amplitude and 1-T/s field ramp rate for the SIS300 accelerator, developed in the GSI, Darmstadt, is a stability of the magnet influenced by various heat releases arising during operation mode. The computer simulation of the heating of superconducting dipoles and cooling helium during the SIS300 operating cycle was carried out. The analysis of stability is based on the numerical solution of the heat balance equation in the coil and in a single?phase helium flow. Temperature margin of the superconducting dipole during the SIS300 operating cycle was calculated. Possible ways to increase the temperature margin are discussed.
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