Thermodynamic Properties of the Superconducting Dipole Magnet of the SIS100 Synchrotron

Abstract

The Heavy Ion Synchrotron SIS100 is the core facility of the international FAIR project at GSI in Darmstadt. The magnet system of the synchrotron will operate with a high cycle frequency up to 1 Hz. The magnet coils are made of a hollow NbTi composite cable cooled by forced flow of two phase helium. The dynamic heat losses in the magnets caused by fast ramping provide the major part of the heat load to the cryogenic system of SIS100. Recently the first series dipole magnet was produced and is being intensively tested at the cryogenic magnet test facility at GSI. We present the status of these tests together with the obtained operation characteristics like a cool down and training behaviour, dynamic heat release and mass flow rates. c 2014 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the organizing committee of ICEC 25-ICMC 2014.

Fast-Ramped Superconducting Magnets for FAIR Production Status and First Test Results

“…The AC loss measurement results will be refined during the upcoming measurement campaigns; a model can already be given [17], [21]. The data were taken for the different used ramp rates (0.5 T/s to 4 T/s with 0.5 T/s steps) and fitted with the function…”

The effect of simplifications of a numerical mesh on the results of electromagnetic analysis of the Nuclotron-type cable

“…Currently the cables of this type are applied in newly constructed accelerator complexes NICA and FAIR. At FAIR they will be used not only to build magnets magnets, but also at cryogenic transfer lines [1]. The transfer lines will carry electric current and liquid helium between the sections of the accelerator.…”

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

“…The highest heat generation in the shell is expected during the operation under a fast-ramp regime. In this regime the current is going to be varied between 0 and 14 kA in triangular cycles, which are going to be executed with a frequency of 1 Hz [8], giving a local increase speed of the current of approximately 28~kA/s. Electrical conductivity σ of the shell is assumed to be constant and equal to 1.54 •10 6 S/m at a temperature of 300 K. At an operation temperature of 4 K it is expected to be approximately 30% higher [20].…”

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