Analysis of the Eddy Current Relaxation Time Effects in the FAIR SIS 100 Main Magnets

Fischer, E.; Kurnyshov, R.; Shcherbakov, P.

doi:10.1109/tasc.2007.897733

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Eddy currents induced in non-superconducting parts of the accelerator by fast-ramping currents in magnets and bus-bars are the additional sources of heat. Eddy currents power in the support structure of the magnet was calculated previously and was found to be relatively high, when compared to heat budget [17].…”

Section: Introductionmentioning

confidence: 88%

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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Section: Introductionmentioning

confidence: 88%

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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“…The accelerator is going to operate under several regimes, with the most demanding one being the training regime [7]. In this case the triangular current I ap (t) is applied, the same as analyzed in the context of SIS100 main magnets [11] and the shells of the bus-bars at the transfer lines [12]. Its frequency is 1 Hz and it oscillates between 0 and 13 kA, giving a very high current change rate of 26 kA/s.…”

Section: Methodsmentioning

confidence: 99%

“…The general formula for the heat behaviour of the modelled system takes the form of Equation (11). The equation also shows how the change of temperature of an element is calculated.…”

Section: Methodsmentioning

confidence: 99%

Archives of Electrical Engineering

Tomków,

Cholewiński,

Ciszek

et al. 2020

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Sections of the superconducting magnets of the SIS100 particle accelerator, under construction at the Facility for Antiproton and Ion Research (FAIR), the Society for Heavy Ion Research (GSI), Darmstadt, are going to be connected with the by-pass lines. Each line will be used to transfer a two-phase helium flow and an electric current. The electric current will be carried by four pairs of superconducting Nuclotron-type cables. Fast-ramping currents are expected to cause the generation of heat within the cables. In this work the results of a numerical thermal analysis of a bus-bar are presented. The amount of heat transferred from the environment was found based on geometric dimensions of the line and applied insulation. The amount of hysteresis loss, generated in the cable during the operation under most demanding regime of the operation of the accelerator, was calculated. According to the amount of the generated heat, the amount of the hysteresis loss is low in relation to the heat generated in the superconducting magnets. Also it was found that the cable used in the line still retains a large margin of current-carrying capacity.

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“…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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Analysis of the Eddy Current Relaxation Time Effects in the FAIR SIS 100 Main Magnets

Cited by 5 publications

References 3 publications

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

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

Archives of Electrical Engineering

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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