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| TUPSA019 |
Power Supply and Protection System of the Nuclotron Booster in the NICA Project
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power-supply, booster, dipole, quadrupole |
83 |
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- A. V. Kudashkin
JINR/VBLHEP, Moscow
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The Nuclotron Booster in NICA project is aimed to accelerate heavy ions up to 600 MeV/u to provide effective stripping before injection into the Nuclotron. The Booster power supply system consists of one powerful unit, providing maximum current of 12 kA and field ramp up to 1 T/s, and two additional units, that are used for the ring working point adjustment. The quench protection system is based on thyristor keys. Structure and parameters of the power sypply system is presented.
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| THCHC03 |
Cooling System of the SIS300 Accelerator
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dipole, cryogenics, quadrupole, multipole |
303 |
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- S. Zinchenko, A. I. Ageev, S. Kozub, V. Zubko
IHEP Protvino, Protvino, Moscow Region
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The Facility for Antiprotons and Ion Research (FAIR) being under construction in Germany as an international project is a cascade of accelerators; two last accelerators from this cascade will be made with the use of superconducting magnets. The large volume of the executed work on the SIS300 superconductive equipment allowed to start the estimation of the basic parameters of SIS300 cooling system. On the base of many research notes and calculations the item-by-item heat load budget at the helium temperature level is composed. Cooling system flow diagram is proposed, the calculated single phase helium temperature profiles along the string of magnets are presented and discussed. Helium flow pressure drop along the string of magnets during cooling down is calculated on the basis of "temperature wave" model and cooling down time of the accelerator is estimated.
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Slides
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| THPSC005 |
Materials for Fast Cycling Accelerator Superconducting Magnets
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dipole, quadrupole, vacuum, insertion |
331 |
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- P. A. Shcherbakov, I. Bogdanov, S. Kozub, L. S. Shirshov, I. Slabodchikov, V. Sytnik, L. Tkachenko, V. Zubko
IHEP Protvino, Protvino, Moscow Region
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Funding: Rosatom, contract Í.4å.45.03.10.1027
Development of fast-cycling superconducting magnets with high field amplitudes and ramp rate makes severe requirements especially to material properties in order to improve field quality and to reduce AC losses. Analysis of experimental and literature data is fulfilled for magnetic characteristics of electric steels at different temperatures. Susceptibilities of stainless steels of different grades are examined as well as a tolerance on the value of the magnetic permeability. Mechanical, thermophysical and technological properties at room and cryogenic temperatures are presented. Comparison of steel characteristics, selected for the SIS300 quadrupole prototype, with the steels, used in the SIS300 dipole and steels, applied in the SIS100 prototype magnets is carried out. General advices to the choice of materials for electrical and stainless steels, used in a design of fast-cycling magnets, are given.
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| THPSC006 |
Test Facility for SIS300 Cryomodules
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cryogenics, quadrupole, vacuum, controls |
334 |
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- A. Vlasov, A. I. Ageev, E. Kashtanov, А. Khartchenko, S. Kozub, S. Zinchenko
IHEP Protvino, Protvino, Moscow Region
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Within the framework of participation in FAIR project IHEP develops the fast-cycling superconducting quadrupole and corrector magnets for SIS300 accelerator. These magnets in the specific combinations will be united into the so called cryomodules having common cryostat. The facility for testing these cryomodules in the forced flow cooling mode, where it is intended to carry out the complex of electrical, magnetic and thermophysical tests, is examined. The facility is based on the existing helium compression and purification equipment, helium refrigerator and research cryostats. A satellite refrigerator is added to the cryogenic system, which also works as the helium mass flow rate multiplier.
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| THPSC007 |
Study of Electrodynamic and Thermodynamic Mechanisms Influencing Stability of Superconducting Rutherford Cable
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quadrupole, simulation, synchrotron, injection |
337 |
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- V. Zubko, I. Bogdanov, S. Kozub, P. A. Shcherbakov, L. S. Shirshov, L. Tkachenko
IHEP Protvino, Protvino, Moscow Region
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Stability for superconducting fast-cycling dipoles and quadrupoles plays an important role. A feature of a complex network of strands and strand-to-strand contacts, current distribution in the network have to be taken into account for superconducting cables. The coupled numerical simulation of electromagnetic and thermal processes in Rutherford superconducting cables during the initiation of a quench was carried out. The network model has been combined with thermal analysis, which allows one to model quench dynamics, including the effects of a current redistribution in strands, discontinuities and inhomogeneity, the initial heating in strand, and, as a result, occasional quench recovery or runaway quench propagations. A computer simulation has been made for study of dependence of the minimum quench energy on ratio operating/critical currents for cables with and without core.
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| THPSC008 |
Superconducting Transformers for Study of High-Current Superconducting Cables
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dipole, induction, cryogenics, power-supply |
340 |
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- L. S. Shirshov, I. Bogdanov, E. Kashtanov, S. Kozub, P. A. Shcherbakov, I. Slabodchikov, L. Tkachenko, V. Zubko
IHEP Protvino, Protvino, Moscow Region
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A facility for measurement of critical current and minimal quench energy of Rutherford-type superconducting cables for accelerator magnets is created. The sample current is energized by a superconducting transformer circuit using an inductive method, where the sample conductor is a part of the secondary circuit. Two superconducting transformers were built; one of them is a solenoid type coil. The transformer consists of two concentric solenoids; the secondary coil is placed inside the primary coil. External magnetic field up to 6.5 T is provided by a superconducting solenoid with the aperture diameter of 60 mm. The second superconducting transformer with race-track coils has been designed and taken into operation. Short-circuited sample, fixed on a special holder, is placed in the aperture of a superconducting dipole magnet such way that the plane of sample loop is perpendicular to direction of external magnetic field, which can reach up to 6 T. The critical current of the secondary superconducting coil is 18 kA. The equipment for measurements of characteristics superconducting cable versus magnetic field is described.
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| THPSC009 |
Experimental Study of Characteristics of Cable for Fast-Cycling Superconducting Magnets
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quadrupole, controls, magnet-design |
343 |
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- I. Bogdanov, E. Kashtanov, S. Kozub, P. A. Shcherbakov, L. S. Shirshov, I. Slabodchikov, L. Tkachenko, V. Zubko
IHEP Protvino, Protvino, Moscow Region
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Funding: Russian Foundation for Basic Research. Project no. 09-08-00528.
Fast-cycling magnetic fields, produced by superconducting magnets of the SIS300 accelerator, generate cable losses, which should be reduced by increase of contact resistances between wires in the cable. For this purpose various methods of cable interstrand resistance increasing are used successfully. But the values of contact resistances have strong influence on a stability, which could be characterized by minimum quench energy (MQE). From this point of view at IHEP it was carried out the experimental study of Rutherford type 19-strand superconducting cable with high value of contact resistances. Contact resistances and MQE measurements were performed. The description of features of samples, the measurement scheme and procedure are presented along with the experimental results.
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