CHATS on Applied Superconductivity 2019

Contribution List

39. Heat transport in tilted stacks of HTS tapes at temperatures above 20K

Łukasz Tomków (University of Cambridge)

09/07/2019, 09:30

Session I

42. Hydraulic characterization of conductor prototypes for fusion magnets

Monika Lewandowska (West Pomeranian University of Technology, Szczecin)

09/07/2019, 10:00

Session I

41. Strand-Jacket Thermal Contact Resistance of REBCO Conductor Measured on Dummy Conductors

Rui Kang

09/07/2019, 10:50

Session I

40. Steady-state transverse heat transfer in a single channel CICC

Aleksandra Dembkowska (West Pomeranian University of Technology, Szczecin)

09/07/2019, 11:20

Session I

43. On the Mechanical Behavior of a Nb3Sn Superconducting Coil During a Quench: Three-Dimensional Finite Element Analysis of a Quench Heater Protected Quench

Jose Ferradas Troitino (Universite de Geneve (CH))

09/07/2019, 11:50

Session II

44. LTS magnets electro-mechanical modelling taking into account magnetic iron forces

Douglas Martins Araujo (CERN)

09/07/2019, 12:20

Session II

45. Electro-Mechanical FE modeling of CORC® cable configurations based on bending experiments.

Arend Nijhuis (University of Twente)

09/07/2019, 14:10

Session II

51. A-formulation method for full 3D FEM computation of the superconducting magnetization.

Mykola Soloviov (Institute of Electrical Engineering Slovak Academy of Sciences )

09/07/2019, 14:40

Session III

53. Field Quality Analysis in the HTS Dipole Insert-Magnet Feather M2 with the Finite Element Method.

Lorenzo Bortot (CERN)

09/07/2019, 15:10

Session III

47. Adaptation of the nuclear safety code CATHARE3 to supercritical helium flow.

Sulayman Shoala (CEA/DRF)

10/07/2019, 09:00

Session IV

46. Simulation of a cryogenic capillary tube: thermodynamic behavior subjected to heat load.

Maria Barba (CEA (Commissariat à l'Énergie Atomique))

10/07/2019, 09:30

Session IV

48. An update of dynamic thermal-hydraulic simulations of the JT-60SA Cryogenic system for preparing plasma operation

François BONNE (CEA)

10/07/2019, 10:00

Session IV

49. Parametric study and optimization of the cryo-magnetic system for EU DEMO at the pre-conceptual design phase

Christine Hoa (CEA,IRIG)

10/07/2019, 10:50

Session IV

54. Thermal analysis of AC loss heated Nb3Sn coil samples for the High Luminosity upgrade of the LHC.

Kirtana Puthran (CERN)

10/07/2019, 11:20

Session V

55. Electro-thermal 1D model of the SIS100 superconducting dipole magnet.

Piotr Szwangruber (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

10/07/2019, 11:50

Session V

56. PSpice modeling of the inrush and fault currents in a 21 MVA HTS transformer.

Pawel Surdacki (Lublin University of Technology)

10/07/2019, 12:20

Session V

57. 1D and 2D finite-element approaches to extract the resistivity of the superconductor material from pulsed current measurements on HTS commercial tapes.

Nicolo' Riva (EPFL - EPF Lausanne)

10/07/2019, 14:10

Session V

58. Analysis of Current Distirbution during Quench in a Pancake coil wound with REBCO Roebel cable.

Marco Breschi (University of Bologna)

10/07/2019, 14:40

Session V

59. User Defined Elements in ANSYS for Multiphysics Modeling of Superconducting Magnets.

Lucas Brouwer (Lawrence Berkeley National Laboratory)

10/07/2019, 15:10

Session VI

60. OLYMPE, a multi-physic platform for fusion magnet design.

Quentin Le Coz (CEA)

10/07/2019, 16:00

Session VI

61. Empowering the 4C code for the thermal-hydraulic analysis of coils for the design of future SC tokamaks: a novel, fully-3D model of the TF coil structures.

Roberto Bonifetto (Politecnico di Torino)

10/07/2019, 16:30

Session VI

62. Fundamental description of Field Induced Josephson junctions and devices built on their base.

Krzysztof Pomorski (University College Dublin)

11/07/2019, 08:55

Session VI

63. FEM Modeling Of Multilayer Canted Cosine Theta (CCT) Magnets.

Rafal Ortwein / Przemyslaw Wachal

11/07/2019, 09:25

Session VI

68. Analysis of quench in HTS conductors for fusion applications: a novel 1D thermal-hydraulic modeling approach.

Andrea Zappatore (Politecnico di Torino)

11/07/2019, 10:00

Session VII

65. Study on conditions for successful quench protections of coils wound with coated conductors by short-sample experiments and quench simulations.

Naoyuki Amemiya (Kyoto University)

11/07/2019, 10:50

Session VII

66. Modelling of a 50 kA REBCO Conductor with Multi-strand Made by Twisted Stacked Tapes.

Rui Kang

11/07/2019, 11:20

Session VII

67. Design and analysis of HTS subsize-conductors for quench investigations towards future HTS fusion magnets.

Michael Wolf (Karlsruhe Institute of Technology (KIT))

11/07/2019, 11:50

Session VII

69. Quench Thermohydraulic Analysis of Tore Supra/WEST TF Coil and Smooth Quench Occurrence in Tokamak.

Sylvie NICOLLET (CEA)

11/07/2019, 12:20

Session VIII

70. Numerical Investigation of Quench Event in the Innermost Pair of the KSTAR Central Solenoids.

Dong Keun Oh

11/07/2019, 14:10

Session VIII

71. Quench Protection Design of the HL-LHC Hollow Electron Lens System.

Michal Maciejewski (Technical University of Lodz(PL))

11/07/2019, 14:40

Session VIII

73. Towards to Quench Limit Determination of Superconducting Magnet with use of Thermal-Electrical Analogy

Dariusz Bocian (Institute of Nuclear Physics Polish Academy of Sciences (Kraków, PL))

11/07/2019, 15:10

Session VIII

The superconducting magnets are an essential part of large particle accelerators. The superconductors used in winding the coils of these magnets are characterized by the critical surface determined by three parameters: the critical temperature (Tc), the critical current density (Jc) and the critical magnetic field (Bc). The energy deposited in the superconductors by the particles lost from the...

72. Workshop wrap-up

11/07/2019, 16:00

Wrap-up session

16. A-formulation method for full 3D FEM computation of the superconducting magnetization

Dr Mykola Solovyov (Institute of Electrical Engineering Slovak Academy of Sciences )

A-formulation is the basic approach for solving electromagnetic problems using FEM. Utilizing time derivatives of vector potential allows computing of the critical current density distribution in agreement with the critical state model. Previously, such superconductor’s representation in 2D delivered results in AC losses estimation for single wires, cables and coils with good agreement with...

21. Adaptation of the nuclear safety code CATHARE3 to supercritical helium flow.

Mr Sulayman Shoala (CEA,IRIG)

Several international projects on nuclear fusion are in progress and comprise cryogenic systems for components such as superconducting magnets or cryopumps. Different thermal-hydraulic codes already exist for sizing and validating these devices, but there is still no qualified scientific calculation tool to perform safety thermal hydraulic analyses encountered in fusion reactors. For this...

28. An update of dynamic thermal-hydraulic simulations of the JT-60SA Cryogenic system for preparing plasma operation

François BONNE (CEA)

The JT-60SA cryogenic system will be operated at cryogenic temperature in 2019 in closed loop, without the cryogenic users (superconducting magnets, current leads, thermal shields). It will be another opportunity to verify the efficiency of the control strategies in order to handle plasma operation planned in 2020. This paper updates the heat load profiles to be extracted by the refrigerator...

33. Analysis of Current Distirbution during Quench in a Pancake coil wound with REBCO Roebel cable

Prof. Marco Breschi (University of Bologna)

Roebel cables assembled with HTS tapes are a promising technology for several AC and DC applications. The continuous transposition of strands, the ability to efficiently redistribute current, combined with the capability of REBCO tapes to operate at high magnetic fields allow Roebel-based devices to carry large transport currents with reduced AC losses. These features make them suitable for...

7. Analysis of quench in HTS conductors for fusion applications: a novel 1D thermal-hydraulic modeling approach

Andrea Zappatore (Politecnico di Torino)

Several new conductor designs for fusion applications, based on High Temperature Superconducting (HTS) materials, have been proposed worldwide in the recent past. Most of them are based on the twisted-stacked-tape cable (TSTC) idea: a stack of HTS tapes, whose superconducting layer is made of rare-earth-barium-copper oxides, is twisted, soldered and embedded in a copper tube, constituting a...

17. Comparison of quench behaviors on 2G quasi-isotropic strands made by different metal sheaths and fillers at 4.2 K

Mr Changtao kan

This paper numerically compares the thermal stability of geometrically symmetrical strands with different kinds of metal sheaths and fillers at 4.2 K, high field environments. The round configuration strands consist of 80 symmetrical stacked second generation 2G wires, metal material filler and sheath. The sheath and filler can be made by different kinds of metals such as copper, aluminum and...

64. Comparison of quench behaviors on 2G quasi-isotropic strands made by different metal sheaths and fillers at 4.2 K.

Changtao Kan

Session VII

24. Design and analysis of HTS subsize-conductors for quench investigations towards future HTS fusion magnets

Michael Wolf (Karlsruhe Institute of Technology (KIT))

High Temperature Superconductors (HTS) are promising materials for future fusion magnets as they allow operating magnets at higher fields and/or higher temperatures and can offer significantly higher temperature margins compared to state-of-the-art low-temperature-superconductor solutions.
The high critical temperature results on the other hand in drastically different behavior of the...

22. Electro-Mechanical FE modeling of CORC® cable configurations based on bending experiments

Dr Arend Nijhuis (University of Twente)

Superconducting CORC® cable or wire is composed of helically wound HTS REBCO tapes in multiple layers around a round core. The cable combines isotropic flexibility and high resilience to electromagnetic and thermal loads. The flexibility of the cable is limited by the critical strain value damaging the REBCO layer in the tape. In order to optimize the manufacturing conditions and ultimately...

12. Electro-thermal 1D model of the SIS100 superconducting dipole magnet

Dr Piotr Szwangruber (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

The FAIR Project – a new international Facility for Antiproton and Ion Research is under construction in Darmstadt, Germany. The core machine at FAIR is the SIS100 synchrotron which utilises superconducting magnets in order to guide the heavy ion beam. The bending component of the magnetic field is generated by superferric window-frame dipole magnets symmetrically distributed over the six arc...

19. Empowering the 4C code for the thermal-hydraulic analysis of coils for the design of future SC tokamaks: a novel, fully-3D model of the TF coil structures

Dr Roberto Bonifetto (Politecnico di Torino)

The numerical simulation tools are of paramount importance in the ongoing design process of future fusion reactors like, e.g., the Divertor Tokamak Test (DTT) facility or the European demonstrator (EU DEMO). The application of such tools in predictive mode allows to assess the performance of the different sub-systems, giving important feedbacks to the designers.
Concerning the superconducting...

27. Field Quality Analysis in the HTS Dipole Insert-Magnet Feather M2 with the Finite Element Method

Lorenzo Bortot (CERN)

High temperature superconductors are a promising technology for future particle-physics accelerator magnets. They can help in overcoming the limitations and constraints in today’s high-energy particle accelerators by allowing for higher magnetic fields. At the same time, accelerator magnets need to meet stringent requirements in terms of magnetic field quality. Superconductors made of HTS...

30. Fundamental description of Field Induced Josephson junctions and devices built on their base

Dr Pomorski Krzysztof (University College Dublin)

The placement ferromagnetic strip [1] or ferroelectric strip tuned electrostatically on the top of superconducting strip brings the possibility of obtaining the programmable matter. Such structures can be used for the construction of microelectronics elements. Also they can be used for quantum superconducting circuits. In this work the RCSJ model is used for the simulation of superconducting...

36. Heat transport in tilted stacks of HTS tapes at temperatures above 20K

Dr Łukasz Tomków (University of Cambridge)

Tilted stacks of HTS tapes show favorable properties in terms of magnetization uniformity [1]. Magnetized stacks can be applied in superconducting rotating machines. In such case they will be subjected to varying magnetic fields and heat generation will occur. Therefore, it is important to understand heat transfer in anisotropic structure of a stack to avoid overheating and optimize the...

4. Hydraulic characterization of conductor prototypes for fusion magnets

Prof. Monika Lewandowska (West Pomeranian University of Technology, Szczecin)

Mathematical models used in thermal-hydraulic analyses of superconducting cables, cooled by forced flow supercritical He (SHe), used in fusion technology, are typically 1D, and they require reliable predictive constitutive relations which characterize mass, momentum and energy transfer between different cable components. Momentum transfer is described in terms of friction factor correlations,...

15. LTS magnets electro-mechanical modelling taking into account magnetic iron forces

Douglas Martins Araujo (CERN)

Keywords: High field Nb3Sn magnet ; electro-mechanical modelling ; magnetic forces ; reluctance forces ; coupling phenomena ; strongly coupled ; weakly coupled

In this paper, we aim to show mechanical analysis using models of numerous High field Nb3Sn, both Cosine-Theta and block types magnets, namely FRESCA2, Block type demonstrator for FCC, HEPDipo [1], 11 T and MQXF [2].

On these high...

13. Modelling of a 50 kA REBCO Conductor with Multi-strand Made by Twisted Stacked Tapes

Mr Rui Kang (University of Science and Technology of China, Department of Engineering and Applied Physics)

A 50 kA REBCO cable-in-conduit conductor (CICC) based on the Twisted-Stacked-Tape-cable (TSTC) concept is being developed in Swiss Plasma Center (SPC) for DEMO central solenoid. The conductor contains 12 or 13 strands, which is composed of a soldered stack of REBCO tapes encased with copper profile, and a copper core in center.
In this paper, a multi-strand model is implemented in THEA code to...

10. Numerical Investigation of Quench Event in the Innermost Pair of the KSTAR Central Solenoids

Dong Keun Oh (NFRI)

In 2011, the KSTAR tokamak underwent a real quench, and it is recorded as the unique event of ramp-down by quench detection in the magnet operations. Whereas many efforts had been made to survey the thermohydraulic data, such a quench-generating scenario has been identified for the first time when a minimalistic (0-D thermal) model assessed the risk of given current profile. On the other hand,...

18. OLYMPE, a multi-physic platform for fusion magnet design

Louis ZANI (CEA)

Design studies on tokamak superconducting magnets require a first step of pre-dimensioning followed by detailed analyses. Such analyses aim at verifying that the predefined design criteria are met in nominal and in off-normal conditions. These studies involve different physics and thus several specific numerical codes. In order to ease the process of performing these analyses, the development...

14. On the Mechanical Behavior of a Nb3Sn Superconducting Coil During a Quench: Three-Dimensional Finite Element Analysis of a Quench Heater Protected Quench

Jose Ferradas Troitino (Universite de Geneve (CH))

New high-field accelerator magnets based on Nb3Sn are pushing the boundaries of magnet design and quench protection towards new limits. Their large stored energies and current densities result in a very challenging scenario for magnet protection. Furthermore, the strain sensitivity of Nb3Sn cables turns the electro-mechanical limits of the conductor into a parameter of the highest importance....

29. Parametric study and optimization of the cryo-magnetic system for EU DEMO at the pre-conceptual design phase

Christine Hoa (CEA,IRIG)

The EU DEMO magnet system is at the pre-conceptual design phase with mechanical, electromagnetic and thermal-hydraulic analyses of different conductor designs for the Toroidal Field (TF) coils, the Poloidal Field coils and the Central Solenoid magnet. The cryomagnetic system includes the superconducting magnets cooled by forced flow of supercritical helium at about 4.5 K, the cryo-distribution...

26. PSpice modeling of the inrush and fault currents in a 21 MVA HTS transformer

Prof. Pawel Surdacki (Lublin University of Technology)

Computer models of superconducting transformers allow for optimal selection and construction, as well as for performing numerical tests, at a time when the performance of laboratory experiments is difficult and would lead to the destruction of the transformer.
The study shows computer models of single-phase transformers with the power of 21 MVA: a conventional one with copper windings and a...

23. Quench Protection Design of the HL-LHC Hollow Electron Lens System

Michal Maciejewski (Technical University of Lodz(PL))

Hollow electron lens systems are proposed for the depletion of particles in the halo of proton beams of modern high-energy accelerators such as the High-Luminosity upgrade of the LHC. The system allows for actively regulating the diffusion speed of particles as a complement to standard collimation systems already operating in today’s particle accelerators. The High-Luminosity upgrade aims at...

1. Quench Thermohydraulic Analysis of Tore Supra/WEST TF Coil and Smooth Quench Occurrence in Tokamak

Sylvie NICOLLET (CEA)

The Toroidal Field (TF) system of the Tore Supra/WEST tokamak comprises 18 NbTi superconducting coils cooled by a superfluid helium bath at 1.8 K and carrying a nominal current of 1255 A. On December 19th 2017, at the end of plasma run #52205, the quench of TFC-09, detected by a secondary thermohydraulic signal, triggered the current Fast Safety Discharge (FSD). The analyses revealed that the...

37. Simulation of a cryogenic capillary tube: thermodynamic behavior subjected to heat load.

maria barba (CEA (Commissariat à l'Énergie Atomique))

Pulsating Heat Pipes (PHP) are excellent heat transfer devices, constituting the thermal link between a cold sink and an object to cool. The interest for developing cryogenic pulsating heat pipes to cool superconducting magnets is growing because of their lightness and high thermal performance. A numerical model has been developed using the Navier-Stokes solver from ANSYS Fluent software to...

35. Steady-state transverse heat transfer in a single channel CICC

Monika Lewandowska (West Pomeranian University of Technology, Szczecin)

Current models used for thermal–hydraulic analyses of forced-flow superconducting cables, used in the fusion technology, such as, e.g. Cable-in-Conduit Conductors (CICCs), are typically 1-D. They require reliable predictive expressions for the transverse mass-, momentum- and energy transfer processes between different cable components, in order to reliably simulate the behavior of any...

25. Strand-Jacket Thermal Contact Resistance of REBCO Conductor Measured on Dummy Conductors

Mr Rui Kang (University of Science and Technology of China, Department of Engineering and Applied Physics)

Large amount of steel will be used in the cable-in-conduit conductor (CICC) made of high temperature superconducting (HTS) REBCO tapes for European DEMO central solenoid (CS), to withstand the huge Lorenz force during operation. The maximum cross section of steel in the REBCO conductor is 2588 mm2, which is about 3 times of the total cross section of cable and helium. Consequently, heat...

31. Study on conditions for successful quench protections of coils wound with coated conductors by short-sample experiments and quench simulations

Prof. Naoyuki Amemiya (Kyoto University)

Many coils wound with coated conductors burned, and there are arguments that the quench / thermal runaway of coated-conductor coil is peculiar and that its quench protection is difficult. Indeed, the non-uniform critical current of a coated conductor or its poor mechanical property on various aspects causes quench / thermal runaway. However, it should be noted that some coated-conductor coils...

11. Thermal analysis of AC loss heated Nb3Sn coil samples for the High Luminosity upgrade of the LHC

Ms Kirtana Puthran (CERN)

The High Luminosity upgrade of the Large Hadron Collider (LHC) foresees the installation of Nb3Sn based dipoles (11T Dipole) and quadrupoles (MQXF) at select points of the accelerator. In contrast to the presently used NbTi non-impregnated coils, the fully impregnated Nb3Sn coils will have a significantly different heat extraction performance in response to deposited loads. The precise...

9. User Defined Elements in ANSYS for Multiphysics Modeling of Superconducting Magnets

Lucas Brouwer (Lawrence Berkeley National Laboratory)

The commercial finite element software ANSYS is widely used for mechanical, thermal, and magnetic modeling of superconducting magnets. This software includes the capability for users to create their own element type by writing the code which defines the element's properties and method by which the finite element matrices are generated. After compiling a custom ANSYS executable, all other...