Herman H.J. ten Kate
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View article: Quantifying the Heat Load to Conductors Due to Strain Energy Release in CTD-101 K Magnet Impregnant
Quantifying the Heat Load to Conductors Due to Strain Energy Release in CTD-101 K Magnet Impregnant Open
State-of-the-art Nb3Sn superconducting accelerator magnets are still prone to lengthy training. This study investigates whether direct heat from fractures in commonly used magnet impregnant is sufficient to cause the instabilities during t…
View article: The consolidation programs of the cryogenic systems of the ATLAS and CMS experiments
The consolidation programs of the cryogenic systems of the ATLAS and CMS experiments Open
The CMS and ATLAS experiments and their superconducting magnetic and calorimetric systems, installed in the LHC (Large Hadron Collider) at CERN, have both been equipped with cryogenic installations. The CMS experiment is making use of a la…
View article: Experimental Thermal Performance of Subcooled Ln2 Heat Exchangers for Current Leads in Superconducting Aviation Power Cables
Experimental Thermal Performance of Subcooled Ln2 Heat Exchangers for Current Leads in Superconducting Aviation Power Cables Open
View article: Rapid-cycling HTS magnet for muon acceleration
Rapid-cycling HTS magnet for muon acceleration Open
A very wide range of operational temperatures of the HTS (YBCO) superconductor makes it suitable for the construction of rapid-cycling magnets required for the muon acceleration. The measured [3] very low power loss of the 0.4 T magnet ope…
View article: Quantitative analysis of ITER Poloidal Field joints through rigorous resistivity parameterization
Quantitative analysis of ITER Poloidal Field joints through rigorous resistivity parameterization Open
The lap-type twin-box joints are integral components in International Thermonuclear Experimental Reactor (ITER) fusion magnets, with profound implications for magnet stability based on their electro-magnetic, thermal, and mechanical proper…
View article: Magnets for a Muon Collider—Needs and Plans
Magnets for a Muon Collider—Needs and Plans Open
We describe the magnet challenges for a Muon Collider, an exciting option considered for the future of particle physics at the energy frontier. Starting from the comprehensive work performed by the US Muon Accelerator Program, we have revi…
View article: Awards and Prizes
Awards and Prizes Open
The Award, which may be presented during the Applied Superconductivity Conference or an alternative applied superconductivity conference associated with the Council on Superconductivity, will recognize individuals for contributions in the …
View article: Comparison of Two Detector Magnetic Systems for the Future Circular Hadron-Hadron Collider
Comparison of Two Detector Magnetic Systems for the Future Circular Hadron-Hadron Collider Open
The conceptual design study of a Future Circular hadron-hadron Collider (FCC-hh) to be constructed at CERN with a center-of-mass energy of the order of 100 TeV requires superconducting magnetic systems with a central magnetic flux density …
View article: Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K
Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K Open
Re BCO coils are developed as DC field coils in linear motor systems to increase the force density, in favor of permanent magnets. Such coils have to sustain a relatively large heat load stemming from the AC magnetic field environment in w…
View article: Training Curves of Nb<sub>3</sub>Sn Rutherford Cables With a Wide Range of Impregnation Materials Measured in the BOX Facility
Training Curves of Nb<sub>3</sub>Sn Rutherford Cables With a Wide Range of Impregnation Materials Measured in the BOX Facility Open
Training of accelerator magnets is a costly and time consuming process. The number of training quenches must therefore be reduced to a minimum. We investigate training of impregnated Nb3Sn Rutherford cable in a small-scale exper…
View article: Calculation and measurement of coupling loss in a no-insulation ReBCO racetrack coil exposed to AC magnetic field
Calculation and measurement of coupling loss in a no-insulation ReBCO racetrack coil exposed to AC magnetic field Open
No-insulation coils are self-protecting and can therefore generally be operated at higher current densities. However, the electrical turn-to-turn connections may cause additional AC loss when charging the coil or when it is exposed to a ti…
View article: Effect of Strand Damage in Nb<sub>3</sub>Sn Rutherford Cables on the Quench Propagation in Accelerator Magnets
Effect of Strand Damage in Nb<sub>3</sub>Sn Rutherford Cables on the Quench Propagation in Accelerator Magnets Open
Accelerator magnets employing Nb$_3$Sn Rutherford cables are more susceptible to conductor degradation than Nb-Ti magnets. Recent measurements on a Nb$_3$Sn accelerator magnet have revealed unexpected behaviour such as decaying voltages at…
View article: Magnetization loss and transport current loss in ReBCO racetrack coils carrying stationary current in time-varying magnetic field at 4.2 K
Magnetization loss and transport current loss in ReBCO racetrack coils carrying stationary current in time-varying magnetic field at 4.2 K Open
Re BCO racetrack coils may be used in high-dynamic superconducting linear motor systems, typically replacing either permanent- or electromagnets in the DC stator. Even so, in order to achieve a significant increase in force density, the su…
View article: Training performance of Nb3Sn Rutherford cables in a channel with a wide range of impregnation materials
Training performance of Nb3Sn Rutherford cables in a channel with a wide range of impregnation materials Open
Training of accelerator magnets is a costly and time consuming process. The number of training quenches must therefore be reduced to a minimum. We investigate training of impregnated Nb3Sn Rutherford cable in a small-scale experiment. The …
View article: Differential geometry method for minimum hard-way bending 3D design of coils with ReBCO tape conductor
Differential geometry method for minimum hard-way bending 3D design of coils with ReBCO tape conductor Open
The use of tape conductor poses design challenges for superconducting magnets. Due to its very high aspect ratio, it is hardly possible to bend the conductor over its thin edges (hard-way bending) rather than over its wide side (easy-way b…
View article: Modeling and Characterization of a <i>Re</i>BCO HTS Degaussing Demonstrator
Modeling and Characterization of a <i>Re</i>BCO HTS Degaussing Demonstrator Open
The magnetic modelling and experimental validation of a superconducting degaussing system for maritime vessels is discussed. Degaussing coils compensate for the distortion in the earths’ magnetic field by the magnetized steel hull of a shi…
View article: Thermal and electrical design of superconducting demonstrator for magnetic density separation
Thermal and electrical design of superconducting demonstrator for magnetic density separation Open
In this paper the focus is on thermal and electrical design aspects of a NbTi-based demonstrator magnet for magnetic density separation (MDS) that is being constructed at the University of Twente. MDS is a recycling technology that allows …
View article: A Work Proposal for a Collaborative Study of Magnet Technology for a Future Muon Collider
A Work Proposal for a Collaborative Study of Magnet Technology for a Future Muon Collider Open
In this paper we elaborate on the nature and challenges for the magnet systems of a muon collider as presently considered within the scope of the International Muon Collider Collaboration (IMCC). We outline the structure of the work propos…
View article: Improved training in paraffin-wax impregnated Nb<sub>3</sub>Sn Rutherford cables demonstrated in BOX samples
Improved training in paraffin-wax impregnated Nb<sub>3</sub>Sn Rutherford cables demonstrated in BOX samples Open
Resin-impregnated high-field Nb 3 Sn type of accelerator magnets are known to require extensive training campaigns and even may exhibit performance-limiting defects after thermal or electromagnetic cycling. In order to efficiently explore …
View article: Design of a Cloverleaf-Racetrack Dipole Demonstrator Magnet With Dual <i>Re</i>BCO Conductor
Design of a Cloverleaf-Racetrack Dipole Demonstrator Magnet With Dual <i>Re</i>BCO Conductor Open
For future 20+ T accelerator type magnets, ReBCO superconductors are ideal for their high current density in high magnetic field. At CERN, demonstrator dipole magnets using ReBCO conductor are being developed in order to study their feasib…
View article: Modelling V-I Measurements of Nb<sub>3</sub>Sn Accelerator Magnets With Conductor Degradation
Modelling V-I Measurements of Nb<sub>3</sub>Sn Accelerator Magnets With Conductor Degradation Open
In the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, 11 T dipole and MQXF quadrupole magnets employing Nb3Sn technology have been tested in short and long test configurations. Nb3Sn magnets are more sensitive tha…
View article: Effective Time Constants at 4.2 to 70 K in<i>Re</i>BCO Pancake Coils With Different Inter-Turn Resistances
Effective Time Constants at 4.2 to 70 K in<i>Re</i>BCO Pancake Coils With Different Inter-Turn Resistances Open
For future ReBCO tape based accelerator magnets it is proposed to use no- or partial inter-turn insulation to deal with quench detection and protection. In a non-insulated coil the turns are separated by a finite electrical resistance, pro…
View article: Improved training in paraffin-wax impregnated Nb3Sn Rutherford cables demonstrated in BOX samples
Improved training in paraffin-wax impregnated Nb3Sn Rutherford cables demonstrated in BOX samples Open
Resin-impregnated high-field Nb3Sn type of accelerator magnets are known to require extensive training campaigns and even may exhibit performance-limiting defects after thermal or electromagnetic cycling. In order to efficiently explore te…
View article: Comparison of the Baseline and the Minimal Steel Yoke Superconducting Magnets for the Future Circular Hadron-Hadron Collider
Comparison of the Baseline and the Minimal Steel Yoke Superconducting Magnets for the Future Circular Hadron-Hadron Collider Open
The conceptual design study of a hadron Future Circular hadron-hadron Collider (FCC-hh) with a center-of-mass energy of the order of 100 TeV assumes using in the experimental detector the superconducting magnetic system with a central magn…
View article: Mechanical design of a superconducting demonstrator for magnetic density separation
Mechanical design of a superconducting demonstrator for magnetic density separation Open
The focus of this paper is on the mechanical design of a NbTi-based demonstrator magnet for magnetic density separation (MDS) that is being constructed at the University of Twente. MDS is a new recycling technology that allows the separati…
View article: BOX: an efficient benchmark facility for the study and mitigation of interface-induced training in accelerator type high-field superconducting magnets
BOX: an efficient benchmark facility for the study and mitigation of interface-induced training in accelerator type high-field superconducting magnets Open
For 30 years, training and unpredictable degradation in accelerator type high-field Nb 3 Sn magnets have seriously hampered Nb 3 Sn application. Training and deterioration have to be solved or at least better controlled. The global picture…
View article: Superconductors for fusion: a roadmap
Superconductors for fusion: a roadmap Open
With the first tokamak designed for full nuclear operation now well into final assembly (ITER), and a major new research tokamak starting commissioning (JT60SA), nuclear fusion is becoming a mainstream potential energy source for the futur…
View article: Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation
Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation Open
This article discusses the optimum layout of coils of a superconducting magnet system for magnetic density separation (MDS). MDS is a novel separation technology that combines a vertical magnetic field gradient with a ferrofluid to separat…
View article: Fundamental Electromagnetic Configuration for Generating One-Directional Magnetic Field Gradients
Fundamental Electromagnetic Configuration for Generating One-Directional Magnetic Field Gradients Open
In this article, electromagnet layouts are presented, which generate a magnetic field with a magnitude gradient that does not vary significantly in a horizontal plane but decreases monotonically with the vertical height above the magnet. S…
View article: Ultra-Thin Solenoid and Cryostat Development for Novel Detector Magnets
Ultra-Thin Solenoid and Cryostat Development for Novel Detector Magnets Open
In the scope of the Future Circular electron positron Collider study (FCC-ee), the IDEA detector is developed. It comprises a superconducting solenoid with free bore of 4 m, 6 m long and a central magnetic field of 2 T. The positioning of …