OOIR: Observatory of International Research

Papers

(The TQCC of IEEE Transactions on Applied Superconductivity is 4. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-01-01 to 2026-01-01.)

Article	Citations
Status of Various Types of Undulators at SXFEL	131
Experimental and Analytical Study on Contact Resistance and Current Distribution of NI HTS Coils in Low-Frequency AC Method	58
Designing and Manufacturing of the Fully Configured Multiplet for the Super-FRS at FAIR	56
Metrology In-Process Control for the European Toroidal Field Coil Project	52
FEM Modeling of Superconducting Whole Body, Actively Shielded 7 T MRI Magnets Wound Using Nb₃Sn Strands	45
Optimization of Hemolytic Performance for Blood Pump Based on Temperature Field Analysis and Three Control Strategies	43
Operational Analysis of Integrated Port Energy Systems With Load Reduction Impact	35
Study on Relative Velocity of Moving Disk for Novel HTS Movable Tooth Motor	32
Current Sharing in Spiral Copper-Plated Multifilament Coated Conductors	30
Bi-Filar Coil Winding for Fast Quench Protection	28
Analysis and Optimization of Air Flow Field Suction Tray for Air-Suction Vibrating Tray Seed Metering Device	27
Engineering Design of 1 MJ HTS SMES System With kA-Level Current Capacity for NICA Accelerator	26
The Present Status and Progress of the CHMFL 40 T Hybrid Magnet	25
Research on the Influence of Uneven Temperature Distribution of Transformer Windings on Short Circuit Strength	24
IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering	24
International Round-Robin Test of Critical Current of Superconducting Cable Sample	24
Comparison of Traditional Iron-Dominated and Canted Cosine Theta Dipoles for PbLi Loop	23
Investigation of Wetting Property and Joint Fabrication Pressure on the Resistance and Microstructure of Soldering Joints for REBCO Conductors	23
Performance Improvement of LTS Undulators for Synchrotron Light Sources	23
Conference Author Index	23
Conference Author Index	23
Microstructure Characterization of Nb₃Sn Wires With Nanoprecipitate Artificial Pinning Centers Using Synchrotron High-Energy X-Rays	22
Front Cover	22
Progress in the Design of the ASTERICS 28 GHz ECR Ion Source Superconducting Magnet for the NEWGAIN Project at GANIL	22
Investigation on Magnetic Hysteresis Loss of REBCO Twisted Stack Slotted-Core Cable for Fusion Magnet Application	21

From Nuclotron Synchrotron to NICA Collider—Common Cryogenic Concept for Various Superconducting Magnets, Their Design Specifics and Test Results	21
In Memoriam	21
Construction of the HTS Portions of a Pair of 10 kA Ternary Leads for an “LHe-Free” Test Cryostat	21
Investigating Irradiated Superconducting Magnet Insulation Materials for Particle Accelerators and Other High-Dose Environments	20
Influence of Flux-Flow and Terminal Contacting as Well as Dynamic Resistances Due to Ripple Current on Performance of the km-Class HTS DC Cable	20
IEEE Transactions on Applied Superconductivity Information for Authors	20
Applied Metrology for the Assembly of the Nb₃Sn MQXFA Quadrupole Magnets for the HL-LHC AUP	19
Analysis of the Magnetization-Induced Field Error in a Superconducting Bending Magnet for a Compact, Rapid-Cycling Heavy-Ion Synchrotron	19
Concept Design of the Control System for the Upgrading Pulsed High Magnetic Field Facility	19
Current Sharing Among Three-Strand Parallel Conductors Composed of REBCO Tapes in Three-Phase Armature Coil Conditions	19
Test of a New Cryogenic System for the Superconducting Triplet Quadrupole Magnet	19
FFT-Based Approach for the Mechanical Analysis of Superconducting Rutherford-Type Cables	18
Pulse-Density-Modulated Microwave Generator Using Single-Flux-Quantum Circuits for Controlling Qubits	18
AC Loss Estimation Model for High-Temperature Superconducting Cables Derived From Experiments Simulating Electromagnetic Environments	18
Assessment of the Thermal-Hydraulic Performance of the European DEMO NbTi Bus Bars	18
IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering	18
Transient Electrical Behavior of the TF Superconducting Coils of Divertor Tokamak Test Facility During a Fast Discharge	18
Comparison of Double Relaxation Oscillation SQUIDs and DC-SQUIDs of Large Stewart-McCumber Parameter	18
Influence of Groove Layout on Screening Current Induced Field in Multifilamentary REBCO Stacks	18
Short-Circuit Impedance Analysis of HTS Traction Transformer With Flux Diverters Using Magnetic Energy Method	18
Numerical Analysis on Performances of Critical Current for Rutherford Cable Made From HTS Quasi-Isotropic Strands	17
Simulating Superconducting Fault Current Limiters With Open-Core and Closed-Core Using the J-A Formulation	17
Foil Conductor Model for Efficient Simulation of HTS Coils in Large Scale Applications	17
Self-Protection Characteristic Comparison Between No-Insulation, Metal-as-Insulation, and Surface-Shunted-Metal-as-Insulation REBCO Coils	17
Analysis of Defect Irrelevancy in a Non-Insulated REBCO Pancake Coil Using an Electric Network Model	17
The Influence of Gadolinium Content in GdBCO Industrial 2G HTS Wires on the Superconducting Properties in Magnetic Field	17
Design, Fabrication and Soundness Test of A Bi2223 Magnet Designed for Cooling by Liquid Hydrogen	17
Artificial Pinning Centers and the Quest of High Critical Current Densities in HTS Nanocomposites	16
IEEE Transactions on Applied Superconductivity Information for Authors	16
Quench Modeling of the GaToroid Demonstrator Magnet for Hadron Therapy	16
Enhancement of Bi-2223 Intergrain Connections by Heat Treatment Parameters Optimization	16
Improved Calculation of Magnetic Hysteresis Loss of Stacked Superconducting Cable Under T-A Formulation	16
Effects of Dy and BHO Additions on Performances of MOD-YBa ₂ Cu ₃ O _7-δ	16
Structural Modeling of REBCO VIPER Cable for High-Field Magnet Applications	16
Image Analysis Capabilities and Methodologies of Nb₃Sn Rutherford Cables	16
4-Bit Factorization Circuit Composed of Multiplier Units With Superconducting Flux Qubits Toward Quantum Annealing	16
Towards Ultra-Thin Detector Magnet Designs by Insulating Coil Windings With V$_{2}$O$_{3}$-Epoxy Composite	16
A Study on the Actual Application of Superconducting Cables to the Network	16
Test Result of a Full-Scale Prototype of Beam Separation Dipole Magnet for the High-Luminosity LHC Upgrade	16
Proton Irradiation Effects on the Superconducting Properties of Fe(Se,Te) Thin Films	16
Overview of the Electromagnetic Optimization Literature of Superconducting Solenoidal Magnets and Coils	16
Experimental Study of a Three-Phase Diode Rectifier Operating at Cryogenic Temperature	16
Subwinding Pack Embedding Experiment of CRAFT TF Coil	16
Study of Quench Behavior of No-Insulation REBCO Pancake Considering Complex Critical Current Density Distribution	15
Mechanical Simulation and Energizing Tests of HTS Coils for 10 kW Generator Cooled by Liquid Hydrogen	15
Achievement of High Critical Current Densities by Co-Doping BaMO₃ (M = Zr, Ce, Sn) and Gd₂CuO_4-x for FF-MOD GdBa₂Cu₃O_7-δ	15
An Open-Source Finite Element Quench Simulation Tool for Superconducting Magnets	15
Research on Nondestructive Examination of Jacket Section for CFETR TF Coil	15
Evaluation of Mass Production Results of Cryogenic Structural Stainless Steels for ITER Toroidal Field Coils	15
3D Conceptual Design of R2D2, the Research Racetrack Dipole Demonstrator	15

Numerical and Experimental Investigations on Transformer Winding Damages Under Multiple Short-Circuit Faults	15
Magnetization Loss of Multi-Layered CORC According to Various Winding Types	15
Table of Contents	15
Self-Adapting Voltage Balancing Method for IPOS DAB Converter With TPS Control	15
Elasticity, Plasticity, and Fracture Toughness of REBCO Coated Conductors Characterized via Micromechanical Tests at Room Temperature	15
Fabrication Procedures and Mechanical Supports of No-Insulation All-GdBCO Double Pancake Magnets in Liquid Helium	15
Commissioning Tests for the Detector Solenoid of COMET Experiment	15
Improved PWM Switching Scheme to Mitigate Power Loss and Switch Temperature of CHB Inverters	15
Development of 50-Meter RE-Ba-Cu-O Tapes With Critical Current Over 1750 A/12mm at 65 K, 0.25 T by Advanced-MOCVD	14
Optimal Design of Resonance Circuit Topology for a Wireless Power Transmission System Using HTS Coils	14
Development and Test of a Large-Aperture Nb₃Sn Cos-Theta Dipole Coil With Stress Management	14
An Automatic HTS Flux Pump With Pulsed Voltage Drive	14
Progress of 33 T Cryogen-Free Superconducting Magnet Project at HFLSM	14
Analytical Evaluation of Dipole Performance Limits for a Muon Collider	14
Silver Recycling From Defective GdBCO/Ag High-Temperature Superconducting Bulks	14
IEEE Transactions on Applied Superconductivity Publication Information	14
Conference Author Index	14
IEEE Membership	14
Ultrasonic Waveguides for Quench Detection in HTS Magnets	14
EUCAS 2023 Conference Co-Chairs’ Introduction	14
Experimental Assessment and Model Validation of the SPARC Toroidal Field Model Coil	14
Antenna Designs for Efficient Coupling to Josephson Junctions for THz Microscopy	14
Fabrication and Test of the Fourth Prototype of the D2 Orbit Corrector Dipole for HL-LHC	14
Effects of Grain Size and Interstitial Content on Recrystallization in Nb after Cold Rolling	14
IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering	14
Magnetodynamic H–$\phi$ Formulation for Improving the Convergence and Speed of Numerical Simulations of Superconducting Materials	14
J-A Approach to Simulations of HTS Tapes: How to Couple With Electric Circuits	14
Asynchronous Single Flux Quantum Logic Gates Using Self-Clocking	14
Design of HOM Damped Multi-Cell SRF Cavities for CW Operation in High Current Storage Rings	14
Analytical and Numerical Study of Superconducting Dipole and Quadrupole Performance Limits for a Muon Collider	14
Stepwise Flux Density Amplification of Coil Stacked by HTS Plates With Different Diameter Holes	14
Effect of Current Sharing by Metal Core on Reducing Hot-Spot Temperature of Spiral Coated Conductors	14
Table of Contents	14
A New Design of High-Frequency Magnetic Link With Hybrid Magnetic Core for Power Converter Applications	13
Modeling Results of the Quench Behavior of a Nb-Ti Canted-Cosine-Theta Corrector Magnet for LHC	13
High-Density Photon-Noise-Limited Multi-Octave Submillimeter Kinetic Inductance Detectors for the Prime-Cam 850 GHz Module	13
Conference Author Index	13
Investigating the Impact of BaCuO₂-CuO Ratio on YBCO Thin Film Growth via Transient Liquid-Assisted Fluorine-Free Metal Organic Deposition	13
Electromagnetic Force and Fault-Current Limitation of Self-Shielded HTS DC Cable Under Short-Circuit Current	13
Thermal Loss Analysis, Design, and Test of a Novel HTS Magnet System for the Double-Stator Field-Modulation HTS Electrical Machine	13
Analysis of Damage Behavior of REBCO Stacked Tapes Under Bending Loads	13
Quench and Recovery Characteristic of DC Current Limiting Type CORC Cable	13
Design, Simulation and Test Results of Quench Protection System for a 13-T Twin-Aperture Superconducting Dipole Magnet	13
Numerical Optimization of the FFS Quadrupole	13
Study on the Vibration Characteristics of Suspension Frame System for Maglev Train Under Track Irregularity Harmonic Excitation	13
IEEE Transactions on Applied Superconductivity Publication Information	13
HTS Detector Magnet Demonstrator Based on a 3D-Printed Partially-Insulated Support Cylinder	13
Fifteen Years of Operation of the Compact Muon Solenoid Detector Superconducting Magnet	13
Electrical Quality Assurance for the NbTi Coils of the HL-LHC High Order Corrector Magnets	13
AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core	13
Characterization of the Mechanical and Thermal Properties, Including Fracture Toughness, of Epoxy Resin System DGEBA, POPDA (D400)	13
AC Loss Reduction in REBCO Coated Conductors Using the Hexagonal Arrangement Cabling Method	13
Optimization Design of Superconducting Shielding Layer in Double-Stator HTS Electrical Machine	13
Impact of Anticlastic Deformation on REBCO Tapes Wound in Multilayer Round Cable	12
Nb/a-Si/Nb-Junction Josephson Arbitrary Waveform Synthesizers for Quantum Information	12
Liquid Hydrogen Cooling System for 100 kW-Class HTS Rotor Thermal Design	12
Metal-as-Insulation REBCO Insert: Simplified Protection Scheme and Investigation of Cooling Defect Under High-Field Operation	12
Optimization Design of HTS Field Magnet for Double-Stator HTS-Excitation Machine to Reduce AC Loss	12
Fabrication and Experiments on a 1/2-Scale Demonstration NI-REBCO Coil System of a Skeleton Cyclotron for Cancer Therapy	12
Evaluating Conductor Design and Stability Performance for the Conductor of High-Field Winding Package in CFETR TF Coil	12
Relation Between Composition and Crystalline Structure in Substituted CaKFe₄As₄	12
Design of Control System for the Super-X Test Facility	12
Novel High-Tin Bronze and Nb₃Sn Multifilamentary Wires	12
Test of High Temperature Superconducting REBCO Coil Assembly for a Multi-Frequency ECR Ion Source	12
3D Neutronic and Secondary Particles Analysis on YBa$_{2}$Cu$_{3}$O$_{7-\delta }$ Tapes for Compact Fusion Reactors	12
Basic Research on a Magnetic Refrigeration System for Cooling to Liquid Hydrogen Temperature	12
Residual Stress/Strain Analysis of Bulk YBCO Superconductors Using EBSD	12
Design and Manufacture of a Test Cryostat With MgB₂ Superconducting Magnet Significantly Reducing Helium Consumption	12
Coil Independent Control for Driving APMSM With Multiple Passive Carriers	12
Mechanical Properties of Four-Stacked Two Tape Bundled REBCO Pancake Coils	12
A Numerical Evaluation of Magnetizing Characteristic of Bulk Magnet Excited by Pulsed-Field Magnetization With Different Shaped Soft-Iron Yokes	12
CoCaSCOPE-Mesh Generator: A Tool to Generate 3D Numerical Models of Rutherford Cables	12
Research on Crosstalk of High-Voltage Signal Transmission Cables for Quench Detection System of Chinese Next-Generation Fusion Device	12
Construction of New Branching Point and Operation of New Primary Beam Line at the J-PARC Hadron Facility	12
Detection of Low-Energy Fluxons From Discrete Long Josephson Junctions for Ballistic Computing	12
Effect of Titanium Content and Doping Method on Phase Formation and Properties of Nb₃Sn Strand	12
Magnetic Design of a Compact GaToroid for Very High Energy Electron and Pre-Clinical Hadron Beams	12
Achieving High J _c in High Fields in Multilayer BZO/YBCO Thick Films	12
An Improved Variable Flux Memory Machine Topology With Multi-Stage Magnetization Strategy	12
Investigation of the Mechanical Properties of N50H Jacket for CFETR High-Temperature Superconducting Application	12

The Preload Analyses of CFETR CSMC Pre-compression Structure	12
An Active Controllable Demagnetization of Closed-Loop HTS Magnet and its Distributed 2.5D H-Model	11
A Chip-Based Superconducting Magnetic Trap for Levitating Superconducting Microparticles	11
Influences of Filament Numbers on the Sintering Process of Bi-2223 HTS Tapes	11
The Design of Permanent Magnet Machine With Segmented Poles Based on Nanocomposite Magnets	11
Progress of ITER Central Solenoid Assembly	11
$\upalpha$-Soma: Single Flux Quantum Threshold Cell for Spiking Neural Network Implementations	11
Initial Study on Press Welding With Indium Applied to High-Temperature Superconducting DC Feeder Cables	11
First Short Orbit Nested Corrector Magnet for HL-LHC Produced in the Industry	11
Power Optimization of 50 GHz ERSFQ Circuits	11
The Preparation of MgB₂ Conductors for Magnet Application of SMES in WST	11
Pulsed Field Magnetization of GdBaCuO Superconducting Bulks With High Magnetization Efficiency Using a Split-Type Coil With Soft Iron Yoke	11
Globally Optimal Algorithm of Superconducting Magnet Design for Gyrotrons	11
A 4-Nb-Layer Cell Library Suitable for LSI Superconductor Digital Circuits	11
Optimization of REBa₂Cu₃O₇₋ _x on Flexible, Dielectric Substrates for High-Frequency Applic	11
Study on Aluminum Melting by Superconducting DC Induction Heating	11
The Effect of Field-Dependent $n$-Value on Screening Current, Voltage, and Magnetic Field of REBCO Coil	11
Wave Pipelining in DSFQ Circuits	11
Optimal Impedance Reshaping Approach for Inhibiting Subsynchronous Oscillation in Virtual Synchronous Generator Based on SMES-Battery	11
Prediction of 2G HTS Tape Quench Behavior by Random Forest Model Trained on 2-D FEM Simulations	11
Optimization of Electromagnetic Design After Winding Tests for the Nb₃Sn Cos-Theta Dipole Model for FCC-hh	11
Design of MgB₂ Superconducting Bending Magnet for Beam Transport System of Particle Beam Therapy	11
12 T Insulated REBCO Magnet Used as 1 MJ SMES: Protection Strategies and Preliminary Assembly Tests	11
Transient Thermal Analysis and Experimental Study of the Closed-Loop No-Insulation HTS Magnets of Superconducting Maglev	11
Applications-Oriented Development of Buffer Architecture for REBCO Films on Nonmetallic Substrates	11
HTS Coil and HTS Bulk Arrangement Suitable for Two-Dimensional Navigation of Magnetic Drugs for MDDS	11
A Method to Improve the Field Quality of the Curved Canted–Cosine–Theta Dipole	11
Dynamics of an HTS Pinning Maglev System on a Stability-Enhanced V-Shaped PMG for Urban Transit	11
Current Recycling in Heterogeneous RSFQ Circuits	11
IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering Information	11
Time-Frequency Domain Monitoring Method for the Fault of HTS HVDC Systems Based on AI Classifiers	11
Front Cover	10
Electromagnetic Distribution of Stacked HTS Tapes Subjected to a Rotating Magnetic Field	10
Characteristics of Nb-based Josephson junctions with TaN _x and TaN _x /(Pd-Ni) barriers	10
Design of a 20 T Pulsed Magnet for the Pulsed Field Magnetometer	10
Method of Quench Detection in HTS Magnets	10
Characterization of Traveling-Wave Josephson Parametric Amplifiers at T = 0.3 K	10
Stabilizers for REBCO Conductors for High Performance SFCL	10
Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers	10
Conference Author Index	10
The Role of Stacking Faults in the Enhancement of the a-b Plane Peak in Silver Ion-Irradiated Commercial MOD REBCO Wires	10
Evaluation of the AC Loss Characteristics of Multifilamentary REBCO Tapes by the Mechanical Scratching of MgO Areas	10
Laser-Induced Quench Study of the Magneto-Thermal Stability of Nb₃Sn Wires	10
Front Cover	10
Development of a Novel Iron Core of Fe-Based Nanocrystalline Strip for Scanning Magnet	10
High-$T_{\mathrm{c}}$ Josephson Junction Arrays Fabricated by He-FIB	10
Front Cover	10
Active Guidance Control of the Electromagnetic Propulsion and Electrodynamic Suspension Combined System	10
Magnetometer Calibration Methods	10
Tensile Strength of REBCO Tape During Deposition of Subsequential Layers	10
IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering	10
Superconducting-Oscillatory Neural Network With Pixel Error Detection for Image Recognition	10
Information for Authors	10
Thermal and Electromagnetic Design of a Superconducting Coil	10
Optimization and Testing of CFETR TF Sample VPI Process	10
TechRxiv: Share Your Preprint Research with the World!	10
Probability of Premature Quenching of HTS Coil Due to Local Reduction of Critical Current	10
Conference Author Index	10
Experimental Demonstration of Superconducting Metamaterial Nonlinear Resonators With Well-Isolated Modes	10
A Tabletop X-Ray Tomography Instrument for Nanometer-Scale Imaging: Demonstration of the 1,000-Element Transition-Edge Sensor Subarray	10
A High Performance Insulated REBCO Pancake With Conductive Cooling Capability	10
Conceptual Design of an HTS Canted Cosine Theta Dipole Magnet for Research and Hadron Therapy Accelerators	10
Design of High-Voltage Stator With Ring-Type Air-Core Armature for Direct Grid-Connected HTS Synchronous Condenser	10
Limitations of the DC Output Voltage From HTS Flux Pumps	10
Heat Transfer Analysis of MgB₂ Coil in Heat Treatment Process for Future Fusion Reactor	10
Design Evolution of MADMAX Conductor to a Nb–Ti Cable in Copper Conduit	10
IEEE Transactions on Applied Superconductivity Publication Information	10
Lowering Latency in a High-Speed Gate-Level-Pipelined Single Flux Quantum Datapath Using an Interleaved Register File	10
Waveform Control Pulse Magnetization of GdBaCuO Bulk Near Operating Temperature of Our Superconducting Rotating Machine	10
Performance Analysis of HTS Excited 5 MW Medium-Speed Wind Turbine Generators With Different Stator Feeding Concepts	10
Design and Analysis of High Temperature Superconducting Current Leads for CRAFT TF Magnet	10
Role of Insulation Materials and Cryogenic Coolants on Fault Performance of MW-Scale Fault-Tolerant Current-Limiting Superconducting Transformers	10
Front Cover	10
Impact of Magnet Number on the DC Output of a Dynamo-Type HTS Flux Pump	10
Fabrication of Bi-2223 Superconducting Joint by Hot-Pressing Process	10
Magnetic Relaxation in Commercial REBCO Tapes With and Without Artificial Pinning Centers	9
Study of Thermal Field Analysis Methods of Oil-Filled Motors	9
Transient Simulation and Field Measurement of the Trim Quadrupoles and AC Sextupoles for CSNS/RCS Upgrade	9
An Integrated Methodology to Assess AC Losses in the kHz Range Using the FEM and Partial Element Equivalent Circuit	9
Thermal Conductivity of NI HTS Coil Fabricated by Diffusion Bonding Technique	9
Seismic Analysis of Magnet Systems in Helical Fusion Reactors Designed With Topology Optimization	9
Integrated Operational Characteristic Simulations of a ±100 kV/1 kA Superconducting DC Energy Pipeline Based on Multi-Physics Field Interaction	9
Fast Electromagnetic Design of the MRI Superconducting Magnet Via Deep Residual Neural Networks	9
Unsupervised SFQ-Based Spiking Neural Network	9
A Fast Numerical Approach Toward AC Loss and Critical Current of Large-Scale Stacked Cables	9
AC Loss Measurements of Coils Wound With Spiral-Coated-Conductor Cables	9
Modeling Thermal-Fluid-Dynamic Transients in VIPER Cables With OpenSc²	9
Experimental Results of Ultrahigh-Efficiency Wireless Power Transfer Using Extremely High-Quality Factor Superconducting Coil With Double-Sided Coated Conductor Tape	9
Short-Circuit Fault Simulation of Tri-Axial High Temperature Superconducting Cable in Combined PSCAD-MATLAB	9
Manufacture and Test of CRAFT TF Coil 3 × 3 Mock-Up	9
Assembly and Mechanical Analysis of the Canted-Cosine-Theta Subscale Magnets	9
Influence of Zn Addition in Cu Matrix on the Mechanical and Superconducting Properties of Nb₃Sn Conductor	9
Optimal Dispatch Strategy of Wind-Hydrogen Coupling System Considering Stepped Carbon Trading Mechanism	9
Prediction Method of Direct Normal Irradiance for Solar Thermal Power Plants Based on VMD-WOA-DELM	9
Fabrication of a Nb-Ti Superconducting Closed-Loop Coil for the Next-Generation 45 GHz ECR Ion Source MARS-D	9