Superconducting fast cycling magnets of the Nuclotron

Baldin, A.M.; Agapov, N.N.; Averichev, A.; Donyagin, A.M.; D'yachkov, E.I.; Khodzhibagiyan, Hamlet; Kovalenko, A. D.; Makarov, L.G.; Matyushevsky, E.A.; Smirnov, A.A.

doi:10.1109/77.402687

Cited by 49 publications

(15 citation statements)

References 5 publications

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“…The magnet concept is based on a cold (4.5 K) iron window frame design with superconducting coils. More than 96 magnets of this type were fabricated and installed at the NUCLOTRON accelerator ring in JINR and are operating since 1993 [2]. High magnetic flux density ramp rate, up to 4 T/s, and the maximum flux density in the aperture of 2.0 T are required for this dipole.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Power Losses in a Laminated Dipole Magnet With Superconducting Coils

Kalimov

Fischer

Hess

et al. 2004

IEEE Trans. Appl. Supercond.

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Dynamic processes in a window-frame dipole with superconducting windings and a cold, laminated iron yoke have been investigated experimentally at JINR (Dubna, Russia), and theoretically at GSI (Darmstadt, Germany). The main aim of these investigations was a reduction of energy losses in the yoke during ramping. These losses are produced mainly by energy dissipation due to eddy currents and hysteresis effects in the laminations. Both effects were investigated theoretically. As a result, special end blocks were proposed to reduce eddy current losses. For eddy currents simulation we used a model developed at GSI and St. Petersburg State Polytechnical University (Russia). This model is based on an integro-differential approach to eddy currents in laminated structures and a volume integral method for the magnetization vector in ferromagnetic objects. To test this model a series of experiments were performed at GSI on a normalconducting Heavy Ion Synchrotron dipole magnet. The magnetic field in the aperture of this magnet was controlled with a point coil during the current ramping in the winding. The same transient processes were simulated using software, developed on the basis of the integro-differential method. The theoretical calculations were in reasonable agreement with the measurements.Index Terms-Ion beam applications, magnetic fields, magnets, superconducting accelerator magnets.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Power Losses in a Laminated Dipole Magnet With Superconducting Coils

Kalimov

Fischer

Hess

et al. 2004

IEEE Trans. Appl. Supercond.

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“…The eddy current losses between filaments, having a twist pitch of 8 mm, are major contributors to the AC loss in the cable sample. The results from these measurements show reduced losses compared with the original Nuclotron cable [11] and thus one can expect that with further optimized wires (e.g. 3 µm filament twist pitch ~ 6 mm) the AC losses in the superconducting winding of the SIS 100 dipole at B max B = 2.1 T, dB/dt = 4 T/s, and f= 1 Hz could be 6 W, which is a reduction by a factor of 4 compared to the original design.…”

Section: Experimental Study Of Ac Losses In Wire and Cable Samplesmentioning

confidence: 87%

Design and study of new cables for superconducting accelerator magnets: Synchrotron SIS 100 at GSI and NICA collider at JINR*

Khodzhibagiyan

Drobin

Fischer

et al. 2010

J. Phys.: Conf. Ser.

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Design of a twin-aperture 4 T curved dipole based on high current hollow superconducting cables for the NICA collider at JINR A Kovalenko, A Bychkov, A Gromov et al. -Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation E Fischer, P Schnizer, K Weiss et al. Abstract. Recent data from the design of new optimized options of NbTi composite wires and hollow cables for fast cycling synchrotron SIS100 at GSI and NICA collider at JINR are presented. The SIS100 new cable is proposed to be used for manufacturing of single-layer coil for dipole magnet with maximal amplitude of pulsed magnetic field up to 2 T. The cable should provide continues pulsed operation at the current amplitude of I = 13 kA and magnetic field ramp rate of dB/dt = 4 T/s. The results of experimental study of energy losses in the new wire and cable samples for SIS100 magnets are presented. The design cable parameters for the NICA 4 T dipole magnet are fixed at the level of I =17 kA and dB/dt = 1 T/s. The status of the work is presented and discussed.

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“…The development of prototypes of magnets for the new accelerator was completed in the mid-1980s [5]. From 1987 to 1992, more than 100 dipole and 66 quadrupole magnetic-cryostatic models of its magnetic system were fabricated and completed complex tests [6]. The assembly of the Nuclotron was completed in January 1993, and the first cooling session and operations with the beam were performed in March of the same year [7].…”

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confidence: 99%

Nuclotron superconducting magnets and their improvement for use in the SIS100 heavy-ion synchrotron in the fair project

Kovalenko¹,

Kekelidze²,

Trubnikov³

et al. 2012

At Energy

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At the beginning of the 1970s, the stage of development and assimilation of magnetic and accelerator technologies based on superconductivity started in the leading scientific centers in world which were studying the fundamental problems of nuclear physics and the structure of matter. Superconductivity for developing magnets for the proton synchrotron with field amplitude much greater than the limit for ordinary magnets (B~ 2 T) was harnessed at Fermi Lab (Batavia, USA). The magnetic system of the Tevatron with field amplitude in the working aperture to 4.7 T, placed inside the synchrotron tunnel at energy 500 GeV, made it possible to double the energy of the accelerator. The field in the Tevatron magnets is formed by a multi-turn winding, fabricated on precision equipment. The accuracy of its geometric dimensions determines the quality of the magnetic field in the aperture. Superconducting magnets of this type in their modern form were used in the designs of other accelerators and were termed cos θ magnets. The magnets are cooled successively; the cool-down time of the magnetic system to the working temperature is weeks.A precision cos θ magnet, cryostat with a vessel for liquid helium, heat screen, vacuum jacket, and anchoring of the magnet are integral parts of an extremely labor-intensive, metal-intensive, and expensive cryogenic-magnetic system. Magnets of a new type [3] were developed in the High-Energy Laboratory at the Joint Institute for Nuclear Research (OIYaI) to considerably simplify and reduce the cost of the construction of the superconducting magnet and its cryostating system for the Nuclotron -a specialized synchrotron for relativistic nuclei [1, 2]. Their fundamental difference lay in the use of a magnetic with a window-frame cross-sectional geometry instead of the cos θ precision magnet and a specially developed tubular superconducting cable, intended for pulsed magnets with rapid ramping of the field, instead of the flat superconducting Rutherford cable. In the case of tubular cable, as opposed to Rutherford cable, there is no coil or frame electric insulation in the path of heat flow from the superconductor to the helium; this improves considerably the conditions for cryostating of the superconductor. In addition, the use of two-phase helium as the cryogenic coolant makes the conditions for cooling the superconductor in the tubular cable of the pulsed magnets of the accelerator unique, making it possible to operate with record high field ramping 4 T/sec and higher [4]. On the whole, the concept adopted made it possible to minimize the transverse cross section of the Nuclotron magnet, eliminate the helium vessel inside the cryostat, secure an operating regime with field rise and fall rate 4 T/sec, economize on materials and power supply, simplify the external infrastructure, and most importantly organize the fabrication and testing of the magnets on the basis of the production capacity of OIYaI.OIYaI Nuclotron -SIS100 Prototype. The development of the Nuclotron, a superconducting, strongly focus...

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Superconducting fast cycling magnets of the Nuclotron

Cited by 49 publications

References 5 publications

Investigation of the Power Losses in a Laminated Dipole Magnet With Superconducting Coils

Investigation of the Power Losses in a Laminated Dipole Magnet With Superconducting Coils

Design and study of new cables for superconducting accelerator magnets: Synchrotron SIS 100 at GSI and NICA collider at JINR*

Nuclotron superconducting magnets and their improvement for use in the SIS100 heavy-ion synchrotron in the fair project

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