Thermodynamic Properties of Fast Ramped Superconducting Accelerator Magnets for the Fair Project

Fischer, Egbert; Mierau, Anna; Schnizer, Pierre; Bleile, A.; Gartner, W.; Guymenuk, O.; Khodzhibagiyan, Hamlet; Schroeder, C.; Sikler, G.; Stafiniak, Andrzej; Weisend, J. G.

doi:10.1063/1.3422470

Cited by 8 publications

(9 citation statements)

References 7 publications

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“…The integral verification of the coil design was tested during measurements on our first BNG prototype dipole at GSI (see figure 18) [9,16]. The magnet had shown an excellent short training behaviour of the coil, high critical current (near to short sample limit), as well as weak ramp rate dependence.…”

Section: Integral Test Results For the First Prototype Dipole Magnetmentioning

confidence: 99%

“…The NTC can be used both for superferric magnets up to 2 T maximum field and for cos(θ)-style dipoles at least up to 4.5 T. In this paper we present recent results on theoretical modelling and intensive experimental testing of the mechanical coil structure for the first SIS100 prototype dipole built at BNG Wuerzburg. Some preliminary results and technological consideration were presented in [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation

Fischer

Schnizer

Weiss

et al. 2010

J. Phys.: Conf. Ser.

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Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation Abstract. The heavy ion synchrotron SIS100 is the core component of the Facility for Antiproton and Ion Research (FAIR) currently under construction at GSI in Darmstadt. It is rapidly cycled with a ramp rate of 4 T/s up to 2 T maximum field and a repetition frequency of 1 Hz. The superconducting coils of the Nuclotron-type magnets utilise a hollow cable cooled with a forced two phase helium flow. These coils must operate reliably over a period of at least 20 years and thus survive 2 · 10 8 load cycles. Intensive R&D is necessary to find the optimal solution preventing any possible damage of the coils by the fast pulsing loads over the life time taking into account the complex fine structure of the cable and coil designs as well as its sensitive influence on the field quality, AC loss generation and quench protection. We used FEM codes to analyse critical aspects of various design options and had manufactured coils for detailed mechanical tests. These tests on samples extracted from the coil are: thermal expansion measurements in all three directions on the cable package itself and its composite elements, compression tests and investigation of the Inter Laminar Shear Stress (ILSS). The stress strain behaviour of the cable package was measured along the transversal direction; the most important one to sustain the cycling load by Lorentz forces. A second sample was fatigue tested. Successful integral operation test results for the coil mechanics have been obtained within our first experimental runs on the prototype dipole magnets already started at GSI in the end of 2008.

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Section: Integral Test Results For the First Prototype Dipole Magnetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation

Fischer

Schnizer

Weiss

et al. 2010

J. Phys.: Conf. Ser.

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“…SIS100 magnets are going to operate under several regimes [8]. AC losses occurring in superconducting magnets were calculated analytically [9] and measured experimentally [10,11]. They were found to be major heat input for both SIS100 [12] and its planned extension, SIS300 [13].…”

Section: Introductionmentioning

confidence: 99%

Heat generation by eddy currents in a shell of superconducting bus-bars for SIS100 particle accelerator at FAIR

Trojanowski

Ciszek

Chorowski

2017

Archives of Electrical Engineering

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Superconducting magnets in the SIS100 particle accelerator require the supply of liquid helium and electric current. Both are transported with by-pass lines designed at Wrocław University of Technology. Bus-bars used to transfer an electric current between the sections of the accelerator will be encased in a steel shell. Eddy currents are expected to appear in the shell during fast-ramp operation of magnets. Heat generation, which should be limited in any cryogenic system, will appear in the shell. In this work the amount of heat generated is assessed depending on the geometry of an assembly of the bus-bars and the shell. Numerical and analytical calculations are described. It was found that heat generation in the shell is relatively small when compared to other sources present in the accelerator and its value strongly depends on the geometry of the shell. The distribution of eddy currents and generated heat for different geometrical options are presented. Based on the results of the calculations the optimal design is proposed.

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“…Detailed descriptions of the design and of the manufacturing processes are available in [8,9]. This magnet has been tested since December 2008 and its AC losses were measured [4,10] next to its magnetic field [11,12] and the AC losses of the vacuum chamber [10] (see also figure 2). All these measurements showed that the hydraulic resistance of the cooling tubes in the coil limit the maximum cooling power to slightly less than 45 W, thus this magnet can not be run in the important operation cycles foreseen for FAIR [13] (roughly a triangular cycle form 0.22 -2.1 -0.22 T with 0.8 seconds pause (called "2c") at the lower level and even more intensive ones up to a pure triangular cycle (denoted by /\)) as predicted [5,14].…”

Section: Introductionmentioning

confidence: 99%

“…The magnets create heat when they are ramped due to hysteresis and eddy current effects, which were reduced by a factor of two during previous R&D [2]. Important improvements were also achieved for the magnetic field homogeneity and for the mechanical stability of the coil [3,2,4]. The main design issues and operation parameters had been tested on mockups and short model magnets [5,6].…”

Section: Introductionmentioning

confidence: 99%

Impact of the beam pipe design on the operation parameters of the superconducting magnets for the SIS 100 synchrotron of the FAIR project

Fischer

Schnizer

Heil

et al. 2010

J. Phys.: Conf. Ser.

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Impact of the beam pipe design on the operation parameters of the superconducting magnets for the SIS 100 synchrotron of the FAIR project Abstract. The SIS 100 accelerator of the Facility for Antiprotons and Ion Research (FAIR)at GSI Darmstadt will be the world's second fast ramped synchrotron utilising superconducting magnets in heavy ion research facilities. The request for high current Uranium beams requires vacuum of extremely high quality that can be achieved in long term operation only by cold vacuum chambers acting as a cryogenic pump. Its mechanical stable design options are strongly limited by AC loss generation and field distortion problems. Previous R&D indicated that cooling tubes, keeping the vacuum chamber below 15 K, create large additional eddy currents and thus deteriorate the field with a sextupole. This effect is most dominant at the start of the ramp. The ramp rate of the correctors is limited by the maximum available voltage and as by the heat created on the ramp up and the cooling efficiency of the Nuclotron-type cable. Thus we investigate different means to simplify the vacuum chamber design keeping its temperature below 15 K in the area where the highest suction pumping is required with alternative cooling methods as well as on the compensation margin the sextupole correctors can provide. This work was partly supported by the BMBF.

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Thermodynamic Properties of Fast Ramped Superconducting Accelerator Magnets for the Fair Project

Cited by 8 publications

References 7 publications

Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation

Critical mechanical structure of superconducting high current coils for fast ramped accelerator magnets with high repetition rates in long term operation

Heat generation by eddy currents in a shell of superconducting bus-bars for SIS100 particle accelerator at FAIR

Impact of the beam pipe design on the operation parameters of the superconducting magnets for the SIS 100 synchrotron of the FAIR project

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