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Showing papers on "Solenoid published in 2015"


Journal ArticleDOI
Zenghua Liu1, Fan Junwei1, Yanan Hu1, Cunfu He1, Bin Wu1 
TL;DR: In this article, a modified planar solenoid array (MPSA) coil-MPTs array was proposed to generate and receive the torsional mode in pipes.
Abstract: In recent investigations, the application of the transducers used in plates has been extended to pipe inspection with circumferential arrays because of the similar particle displacement patterns of some modes between plate and pipe, such as SH and torsional modes. Motivated by the configuration of magnetostrictive patch transducer (MPT), in which a planar solenoid array (PSA) coil was adopted to generate SH waves in plates, we proposed a MPTs array employing a modified planar solenoid array (MPSA) coil, i.e. MPSA coil-MPTs array, for generating and receiving the torsional mode in pipes. The configuration of the MPSA coil modified from PSA coil is suitable to be arranged on the pipe surface and can generate high-power waves. In the suggested configuration of MPT, because the direction of the actuating dynamic magnetic field produced by the MPSA coil is orthogonal to the direction of the static magnetic field produced by the permanent magnets in the magnetostrictive patch, the shear deformation induced by the magnetostriction in the patch will be delivered to the pipe, thus generating the torsional mode. First, it was experimentally verified that the fundamental torsional mode, T(0,1), could be effectively generated and received in pipes with the developed MPSA coil-MPTs array. Then, we studied the relationship between the frequency response characteristic of the developed MPSA coil-MPTs array and the interval defined by the distance of adjacent solenoids in the MPSA coil. Simultaneously, the circumferential crack defects in pipe were successfully identified. Finally, the performance of the MPSA coil-MPTs array was compared with that of previous meander coil-MPTs array. The comparison results demonstrated that the developed MPSA coil-MPTs array could enhance the power of the torsional mode.

54 citations


Journal ArticleDOI
TL;DR: In this paper, a numerical analysis on a new generation of hydraulically controlled servo solenoid injectors for Euro 6 Diesel engine applications has been carried out, where the main innovation of these high-pressure injectors is the replacement of the standard pilot-valve configuration with a pressure-balanced layout.

49 citations


Journal ArticleDOI
TL;DR: In this paper, the saturation fields of cylindrical cryogenic magnetic shields, for quarter-wave resonator cavities, of diameters ranging from 229 to 447 mm were measured at 300 and 10 K.
Abstract: The saturation fields of cylindrical cryogenic magnetic shields, for quarter-wave resonator cavities, of diameters ranging from 229 to 447 mm were measured at 300 and 10 K. A 0.86 T normal conducting solenoid and a 2.5 T superconducting solenoid were used at 300 and 10 K, respectively. The shielding of the high magnetic field region of the cavity, due to fringe fields entering the shield through the beam-port holes of the shield, was examined. The relative initial permeability of toroidal samples from two cryogenic shielding materials were measured at 0.358 A/m, at different frequencies, to extrapolate the static value. These samples were also exposed to external fields up to 0.86 T at 300 K, and the residual magnetic field was measured to check for magnetization of the shielding materials. Results indicate that the performances of the measured cryogenic shielding materials are dependent on the magnitude of the applied field. The performances are improved at cryogenic temperatures only when the shields are exposed to small magnetic fields. At greater fields, however, the performance is degraded at cryogenic temperatures. The shielding materials are not magnetized when exposed to fields up to 0.86 T.

41 citations


Journal ArticleDOI
TL;DR: In this paper, the performance of the Chinese Fusion Engineering Test Reactor (CFETR) superconducting magnet system under normal operation and fault conditions was evaluated using the two-dimensional finite element method.
Abstract: The Chinese Fusion Engineering Test Reactor (CFETR) superconducting magnet system was designed by the National Integration Design Group for Magnetic Confinement Fusion Reactor. The CFETR magnet system consists mainly of a central solenoid (CS) coil with six modules, 16 toroidal field (TF) coils, 8 poloidal field (PF) coils, and a set of correction coils (CC). The electromagnetic stresses and stored magnetic energy are huge on the CFETR magnets since they experience both large current densities and high magnetic field. The electromagnetic, structural and thermal performance needs to be evaluated to ensure that the magnetic field, stress, and hot spot temperature of the magnet system are within the allowed criteria.The evaluation of the electromagnetic performance of the CFETR superconducting magnet system under normal operation and fault conditions was performed. The two-dimensional finite element method was adopted to analyse the stress/strain behaviour of the CFETR CS coils. In addition, the thermal?hydraulic behaviour on quench propagation performance of the CFETR CS and TF coils was analysed to evaluate the hot spot temperature of the cable and the helium pressure inside a jacket during a quench.

39 citations


Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate that the thrust-over-power of the helicon thruster can be increased by enlarging the source diameter, which is qualitatively understood with a simple analysis connecting a global model in the source and a one-dimensional magnetic nozzle model, where the model does not include the magnetic field effect in a source and the cross-field diffusion effect in the magnetic nozzle.
Abstract: Thrust imparted by a helicon plasma thruster is experimentally measured for two different diameter source tubes. The measurements demonstrate that the thrust-over-power of the helicon thruster can be increased by enlarging the source diameter. This result is qualitatively understood with a simple analysis connecting a global model in the source and a one-dimensional magnetic nozzle model, where the model does not include the magnetic field effect in the source and the cross-field diffusion effect in the magnetic nozzle. A mass flow rate of propellant argon and a magnetic field strength are experimentally surveyed; then the thrust of ~18 mN is obtained for the rf power of 1 kW, the 95 mm diameter source, and the largest solenoid current being tested, while the maximum thrust for the 26 mm diameter source is only 5 mN. Furthermore the rf power is increased up to ~6 kW and a thrust close to 60 mN is obtained.

37 citations


Journal ArticleDOI
TL;DR: It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium.
Abstract: Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.

30 citations


Journal ArticleDOI
TL;DR: In this paper, a numerical model was used to analyze the causes of strand damage, including variation in twist pitch length as well as different mechanical properties for copper and Nb3Sn strands, and the results showed that the numerical analysis is consistent with the experiments and provides the optimal cabling conditions for the CFETR CSMC.
Abstract: The China Fusion Engineering Test Reactor (CFETR) is a new tokamak device, whose magnet system includes toroidal field (TF), central solenoid (CS) and poloidal field (PF) coils. The main goal is to build a fusion engineering tokamak reactor with 50–200 MW fusion power and self-sufficiency by blanket, which means that the deuterium–tritium reaction in the plasma produces neutrons and alpha particles, and the neutrons react with the lithium-containing blanket surrounding the plasma, breeding the tritium by lithium–neutron reaction. To develop the manufacturing technique for the full-size CS coil, the Central Solenoid Model Coil (CSMC) project for CFETR was launched first. A Nb3Sn conductor is to be used in the CFETR CSMC, whose design refers to the ITER CS conductor with the same short-twist-pitch cable pattern. Due to the short twist pitch and relatively low void fraction, a high compaction ratio is required during cabling and the risk of strand damage is increased significantly. Although it is impossible to avoid strand deformation for this design, it is crucial to find a way to reduce strand damage as much as possible. A numerical model was used to analyze the causes of strand damage, including variation in twist pitch length as well as different mechanical properties for copper and Nb3Sn strands. Several experiments have been performed to verify the numerical results, including cabling trials for different conditions and critical current (I c) tests on strands with/without deformation. The results show that the numerical analysis is consistent with the experiments and provides the optimal cabling conditions for the CFETR CSMC.

30 citations


Journal ArticleDOI
TL;DR: In this paper, a solenoid actuator with a ferromagnetic plunger was developed to generate both rectilinear and turning motions of a multi-segmented robot.
Abstract: We develop a solenoid actuator with a ferromagnetic plunger to generate both rectilinear and turning motions of a multi-segmented robot. Each segment of the miniaturized robot is actuated by a pair of solenoids, and in-phase and out-of-phase actuations of the solenoid pair cause the linear and turning motions. The theoretical analysis on the actuation force by the solenoid with the magnetic plunger is implemented based on the Biot-Savart law. The optimal design parameters of the solenoid are determined to actuate a segmented body. We manufacture the miniaturized robot consisting of two segments and a pair of solenoids. Experiments are performed to measure the linear and angular displacements of the two-segmented robot for various frictional conditions.

29 citations


Journal ArticleDOI
TL;DR: This work presents a survey of the major systems required for such unconfined magnetic field design, allowing the identification of key technologies for future development.
Abstract: Many active magnetic shielding designs have been proposed in order to reduce the radiation exposure received by astronauts on long duration, deep space missions. While these designs are promising, they pose significant engineering challenges. This work presents a survey of the major systems required for such unconfined magnetic field design, allowing the identification of key technologies for future development. Basic mass calculations are developed for each system and are used to determine the resulting galactic cosmic radiation exposure for a generic solenoid design, using a range of magnetic field strength and thickness values, allowing some of the basic characteristics of such a design to be observed. This study focuses on a solenoid shaped, active magnetic shield design; however, many of the principles discussed are applicable regardless of the exact design configuration, particularly the key technologies cited.

28 citations


Journal ArticleDOI
TL;DR: In this article, a conceptually new outer inter-coil structure separated from the casing is introduced to the toroidal field coils to realize their slender shape, allowing large-bore diagnostic ports for detailed plasma measurements.
Abstract: The most distinctive feature of the superconducting magnet system for JT-60SA is the optimized coil structure in terms of the space utilization as well as the highly accurate coil manufacturing, thus meeting the requirements for the steady-state tokamak research: a conceptually new outer inter-coil structure separated from the casing is introduced to the toroidal field coils to realize their slender shape, allowing large-bore diagnostic ports for detailed plasma measurements. A method to minimize the manufacturing error of the equilibrium-field coils has been established, aiming at the precise plasma shape/position control. A compact butt-joint has been successfully developed for the Central Solenoid, which allows an optimized utilization of the limited space for the Central Solenoid to extend the duration of the plasma pulse.

28 citations


Journal ArticleDOI
TL;DR: A steady state superconducting tokamak (SST-1) has been commissioned after the successful experimental and engineering validations of its critical sub-systems.
Abstract: A steady state superconducting tokamak (SST-1) has been commissioned after the successful experimental and engineering validations of its critical sub-systems. During the ?engineering validation phase? of SST-1; the cryostat was demonstrated to be leak-tight in all operational scenarios, 80?K thermal shields were demonstrated to be uniformly cooled without regions of ?thermal runaway and hot spots?, the superconducting toroidal field magnets were demonstrated to be cooled to their nominal operational conditions and charged up to 1.5?T of the field at the major radius. The engineering validations further demonstrated the assembled SST-1 machine shell to be a graded, stress?strain optimized and distributed thermo-mechanical device, apart from the integrated vacuum vessel being validated to be UHV compatible etc. Subsequently, ?field error components? in SST-1 were measured to be acceptable towards plasma discharges. A successful breakdown in SST-1 was obtained in SST-1 in June 2013 assisted with electron cyclotron pre-ionization in the second harmonic mode, thus marking the ?first plasma? in SST-1 and the arrival of SST-1 into the league of contemporary steady state devices.Subsequent to the first plasma, successful repeatable plasma start-ups with E???0.4?V?m?1, and plasma current in excess of 70?kA for 400?ms assisted with electron cyclotron heating pre-ionization at a field of 1.5?T have so far been achieved in SST-1. Lengthening the plasma pulse duration with lower hybrid current drive, confinement and transport in SST-1 plasmas and magnetohydrodynamic activities typical to large aspect ratio SST-1 discharges are presently being investigated in SST-1. In parallel, SST-1 has uniquely demonstrated reliable cryo-stable high field operation of superconducting TF magnets in the two-phase cooling mode, operation of vapour-cooled current leads with cold gas instead of liquid helium and an order less dc joint resistance in superconducting magnet winding packs with high transport currents. In parallel, SST-1 is also continually getting up-graded with first wall integration, superconducting central solenoid installation and over-loaded MgB2-brass based current leads etc. Phase-1 of SST-1 up-gradation is scheduled by the first half of 2015, after which long pulse plasma experiments in both circular and elongated configurations have been planned in SST-1.

Journal ArticleDOI
TL;DR: The Helicon-Cathode (HelCat) as mentioned in this paper is a medium-size linear experiment suitable for a wide range of basic plasma science experiments in areas such as electrostatic turbulence and transport, magnetic relaxation and high power microwave (HPM)-plasma interactions.
Abstract: The Helicon-Cathode(HelCat) device is a medium-size linear experiment suitable for a wide range of basic plasma science experiments in areas such as electrostatic turbulence and transport, magnetic relaxation, and high power microwave (HPM)-plasma interactions. The HelCat device is based on dual plasma sources located at opposite ends of the 4 m long vacuum chamber – an RF helicon source at one end and a thermionic cathode at the other. Thirteen coils provide an axial magnetic field B ⩾ 0.220 T that can be configured individually to give various magnetic configurations (e.g. solenoid, mirror, cusp). Additional plasma sources, such as a compact coaxial plasma gun, are also utilized in some experiments, and can be located either along the chamber for perpendicular (to the background magnetic field) plasma injection, or at one of the ends for parallel injection. Using the multiple plasma sources, a wide range of plasma parameters can be obtained. Here, the HelCat device is described in detail and some examples of results from previous and ongoing experiments are given. Additionally, examples of planned experiments and device modifications are also discussed.

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of pulsatile flow induced by a solenoid valve on mass transfer in membrane modules with spacer-filled channels, and showed that pulsatile flows generated with solenoids with frequencies between 10 and 50 can increase up to 50% the mass transfer coefficient in membranes modules operating in laminar flow.

Patent
30 Jan 2015
TL;DR: In this paper, an electromagnetic switch device for a starter includes a pinion-pushing solenoid for pushing out the pinion toward a ring gear of an engine by a plunger thereof.
Abstract: An electromagnetic switch device for a starter includes a pinion-pushing solenoid for pushing out a pinion toward a ring gear of an engine by a plunger thereof, and a motor-energizing solenoid for energizing the motor. The electromagnetic switch device is configured to detect a magnetic flux change in a magnetic circuit of the motor-energizing solenoid due to displacement or deformation of a core of the motor-energizing solenoid caused when the plunger of the pinion-pushing solenoid abuts against a stopper, to determine a timing to start current supply to the motor-energizing solenoid.

Journal ArticleDOI
TL;DR: In this article, an oscillating heat pipe (OHP) filled with ferrofluid and equipped with an annular-type solenoid was used for thermal-to-electrical energy conversion.
Abstract: Thermal-to-electrical energy conversion was demonstrated using an oscillating heat pipe (OHP) filled with ferrofluid and equipped with an annular-type solenoid. The OHP was subjected to a 100 °C axial temperature difference allowing the ferrofluid to passively oscillate through the solenoid, thus accomplishing electromagnetic induction. The measured solenoid voltage consisted of aperiodic pulses with dominant frequencies between 2 and 5 Hz and peak-to-peak amplitudes approaching 1 mV. Despite exposure to the thermal and phase change cycling within the OHP, nanoparticle morphologies and magnetic properties of the ferrofluid remained intact. This energy harvesting method allows for combined thermal management and in-situ power generation.

Journal ArticleDOI
TL;DR: A method is developed to estimate the resistance of the coil of a linear electromagnetic actuator, i.e., of a single-coil linear solenoid, generalized to pulsewidth-modulation (PWM) drive conditions by considering the average of the current of the coils in the successive PWM cycles.
Abstract: The parameters of electrical machines can change considerably during operation due to thermal effects. Therefore, the corresponding models and the estimates of parameters can be subject to a significant bias and uncertainty, which degrade the performance of the system. In this paper, a method is developed to estimate the resistance of the coil of a linear electromagnetic actuator, i.e., of a single-coil linear solenoid. In the electrical model of the solenoid actuator, the inductance depends on the current. The inductance is identified from the transient waveform of the current (step response), and an estimate of the resistance is provided by extrapolating to the steady state of the current. Thus, the resistance can be estimated before the system reaches the steady state. The presented method is generalized to pulsewidth-modulation (PWM) drive conditions by considering the average of the current of the coil in the successive PWM cycles. This improves the suppression of measurement noise. The developed approach is demonstrated through numerical and experimental analyses.

Journal ArticleDOI
TL;DR: In this article, a start-up design code was developed for the development of startup scenarios in VEST, which can predict evolutions of vacuum field structure and plasma current with given operation parameters from the PF coil power supply circuit considering the eddy currents.

Journal ArticleDOI
TL;DR: The NAFASSY (NAtional FAcility for superconducting SYstems) facility is designed to test wound conductor samples under high-field conditions at variable temperatures as discussed by the authors.
Abstract: The 'NAFASSY' (NAtional FAcility for Superconducting SYstems) facility is designed to test wound conductor samples under high-field conditions at variable temperatures. Due to its unique features, it is reasonable to assume that in the near future NAFASSY will have a preeminent role at the international level in the qualification of long coiled cables in operative conditions. The magnetic system consists of a large warm bore background solenoid, made up of three series-connected grading sections obtained by winding three different Nb3Sn Cable-in-Conduit Conductors. Thanks to the financial support of the Italian Ministry for University and Research the low-field coil is currently under production. The design has been properly modified to allow the system to operate also as a stand-alone facility, with an inner bore diameter of 1144 mm. This magnet is able to provide about 7 T on its axis and about 8 T close to the insert inner radius, giving the possibility of performing a test relevant for large-sized NbTi or medium-field Nb3Sn conductors. The detailed design of the 8 T magnet, including the electro-magnetic, structural and thermo-hydraulic analysis, is here reported, as well as the production status.

Journal ArticleDOI
TL;DR: An optimization study of response time in order to improve the dynamic performance of a direct-acting solenoid valve using the verified approximation model called the Kriging model, and an optimization algorithm called the progressive quadratic response surface method (PQRSM).
Abstract: Direct-acting solenoid valves are used in the automotive industry due to their simple structure and quick response in controlling the flow of fluid. We performed an optimization study of response time in order to improve the dynamic performance of a direct-acting solenoid valve. For the optimal design process, we used the commercial optimization software PIAnO, which provides various tools for efficient optimization including design of experiments (DOE), approximation techniques, and a design optimization algorithm. 35 sampling points of computational experiments are performed to find the optimum values of the design variables. In all cases, ANSYS Maxwell electromagnetic analysis software was used to model the electromagnetic dynamics. An approximate model generated from the electromagnetic analysis was estimated and used for the optimization. The best optimization model was selected using the verified approximation model called the Kriging model, and an optimization algorithm called the progressive quadratic response surface method (PQRSM).

Journal ArticleDOI
TL;DR: In this paper, the authors reported the results of qualification and fabrication of the insert coil needed to evaluate the performance of final design conductor for the International Thermonuclear Experimental Reactor (ITER) Central Solenoid (CS).
Abstract: The Japan Atomic Energy Agency (JAEA) and Mitsubishi Electric Corporation are fabricating the insert coil needed to evaluate the performance of final design conductor for the International Thermonuclear Experimental Reactor (ITER) Central Solenoid (CS). The insert, designed by the US ITER Project Office, is a nine-turn single-layer solenoid of 1.5-m diameter. Major operations, such as winding, terminal fabrication, heat treatment, and turn insulation, have thus far been successfully completed. Fabrication will be completed in September 2014, and testing will begin at JAEA's CS Model Coil test facility in early 2015. The results of qualification and fabrication of the insert are reported.

Journal ArticleDOI
TL;DR: In this article, the Laplace equation of a scalar magnetic potential is used to calculate the general vector field inside a real (finite) solenoid, using only the magnitude of the field along the symmetry axis.
Abstract: In a region free of currents, magnetostatics can be described by the Laplace equation of a scalar magnetic potential, and one can apply the same methods commonly used in electrostatics. Here, we show how to calculate the general vector field inside a real (finite) solenoid, using only the magnitude of the field along the symmetry axis. Our method does not require integration or knowledge of the current distribution and is presented through practical examples, including a nonuniform finite solenoid used to produce cold atomic beams via laser cooling. These examples allow educators to discuss the nontrivial calculation of fields off-axis using concepts familiar to most students, while offering the opportunity to introduce themes of current modern research.

Journal ArticleDOI
TL;DR: In this article, the authors proposed a method of identifying solenoid valve transition events by analyzing the current through the Solenoid coil, which allows a user to positively identify the beginning and end of valve transition event through identifying slope changes in the solanoid coil current traces.
Abstract: A method of identifying solenoid valve transition events by analyzing the current through the solenoid coil is proposed. Solenoid valves experience lags and transition times which are non-trivial in the context of control methods that require precise valve timing. The proposed methodology allows a user to positively identify the beginning and end of valve transition events through identifying slope changes in the solenoid coil current traces. This methodology was shown to identify the timing of valve transition events with less than 7% error when compared to measuring the position of the valve spool with a laser displacement sensor. The proposed methodology is based upon measuring the current through the solenoid coil and requires no modification to the valve or valve housing to achieve these results.

Journal ArticleDOI
TL;DR: In this article, the authors present an alternative method of calculation based on the force formula of Weber-Ritz and which does not involve, directly, the field entities E and B, nor the leakage flux from the solenoid or the vector potential.
Abstract: The deflection of charged particle beams by electric and/or magnetic fields is invariably based on the field centred approach associated with Maxwell-Lorentz and incorporated into the Lorentz force formula Here we present an alternative method of calculation based on the force formula of Weber-Ritz and which does not involve, directly, the field entities E and B In this study we evaluate the deflection of an electron beam by a long solenoid carrying direct current and positioned centrally across the beam The experiment has some bearing on the Aharonov-Bohm effect in that our calculations indicate that even for very long solenoids the classical force on the beam remains finite The standard interpretation of the effect is, however, in terms of quantum mechanics and vector potential Experimental measurements have been made of electron beam deflections by three solenoids, 025 m, 050 m and 075 m long; each solenoid is doubly wound with the same winding density (2600 turns per metre) and carrying the same current of 500 A dc Our results indicate that, within the limits of experimental error, both Weber-Ritz and Maxwell-Lorentz theories correlate with measurements for the longer solenoids However in the case of the shortest solenoid, the lack of uniformity of the magnetic field, leads to significant error in the calculation of beam deflection by the Lorentz force By contrast in a Weber-Ritz calculation a precise value of beam deflection is obtained by equating the impulse of the non uniform beam force to the vertical momentum change of the electron This is a fundamentally different approach which uses a statistical summation of forces on the beam in terms of relative velocities between moving electrons and involves a direct computation of the vertical force on the beam due to the circling solenoid current This method has distinct advantages in terms of economy; that is, it does not involve directly field entities E and B, nor the leakage flux from the solenoid or the vector potential

Journal ArticleDOI
01 Jan 2015
TL;DR: Both the simulation and experimental results show that with the proposed adaptive robust controller, the flow forces are well compensated, while the HDPSV achieves disturbance rejection, high precision, fast transient response and broad bandwidth.
Abstract: This article focuses on the high-performance control of a high-response proportional solenoid valve which has two proportional solenoids. The valve is named high-response dual proportional solenoid valve (HDPSV). The HDPSV can achieve faster response than other high-response proportional solenoid valves with one proportional solenoid and has the potential of gaining stronger disturbance rejection due to the differential effect of two proportional solenoids. However, the expense for these advantages is that more complexity and more difficulties are involved in controlling the valve. In this article, the nonlinear dynamic model of the HDPSV is constructed first. The current–force gain of the proportional solenoid is modeled by a modified tanh() function to capture its nonlinear characteristics. An incremental differential allocation strategy is raised to coordinate the action of the two proportional solenoids driving the HDPSV. The model of flow force is built with parametric uncertainty and reconstructed t...

Patent
11 Feb 2015
TL;DR: In this article, the authors propose a conveying and positioning mechanism for assembling a high-frequency transformer, where the conveying device is arranged on a frame on the side surface of a solenoid conveying rail.
Abstract: The utility model provides a solenoid conveying and positioning mechanism for assembling a high-frequency transformer. The solenoid conveying and positioning mechanism aims to solve the problems that a conventional solenoid conveying mechanism occupies a large space, solenoids conveyed by robots are likely to incline, and a correction mechanism is required additionally. The solenoid conveying and positioning mechanism comprises a conveying device conveying solenoids to an assembly bench and a positioning device for positioning solenoid onto the assembly bench, wherein the conveying device is arranged on a frame on the side surface of a solenoid conveying rail, and the conveying device comprises a plugboard circulating along a set trace and a driving unit driving the plugboard to translate. The front end of the plugboard is provided with a plug column matching in size with the through hole of a solenoid, the plugboard can circulate clockwise along the rectangular translation trace on the horizontal plane, and the plug column synchronizes with the plugboard and assembles the solenoid from the outlet end of the solenoid conveying rail to the assembly bench. The positioning device is a liftable compressing base installed above the assembly bench. The solenoid conveying and positioning mechanism occupies a small space, solenoids conveyed are not likely to incline, and a correction mechanism is not required.

Journal ArticleDOI
TL;DR: The main characteristics and test results of the first Switching Network Unit (SNU) of the Central Solenoid for plasma initiation in the international experiment JT-60SA demonstrate the capabilities of the SNU to comply with the requirements.

Journal ArticleDOI
TL;DR: In this paper, the design parameters, electromagnetic distribution, structure and stability analysis of the CS superconducting magnet for CFETR was discussed, and the maximum magnetic field of CS coil was calculated by the coils' operation current based on plasma equilibrium configuration.

Journal ArticleDOI
TL;DR: The COMET Phase-I experiment at the Hadron Hall of J-PARC aims to search for coherent neutrinoless conversion of a muon to an electron as discussed by the authors.
Abstract: The COMET Phase-I experiment now under construction at the Hadron Hall of J-PARC aims to search for coherent neutrinoless conversion of a muon to an electron. The experiment requires a large superconducting solenoid system that consists of 5-T pion capture solenoid and 5~3 T matching solenoid and 3-T 90° pion decay/muon transport curved solenoid. The capture solenoid encloses a target to generate pions. The neutron irradiation generated by the target causes various influences to the capture solenoid. One of the major issues is the cooling of the coil that can be degraded due to irradiation. The analyses and the design that accommodate the irradiation were performed. This paper summarizes the concept of the COMET Phase-I experiment and also the design of the solenoid system, including the analyses associated with the neutron irradiation. Manufacturing of the solenoid system has already started, and its status is also reported in this paper.

DOI
01 Dec 2015
TL;DR: In this article, an overview of the final design and fabrication status of the IFMIF cryomodule, including the design issues, and deals with the strategies implemented in order to mitigate the main technical and logistical risks identified.
Abstract: This paper provides an overview of the final design and fabrication status of the IFMIF cryomodule, including the design issues, and deals with the strategies implemented in order to mitigate the main technical and logistical risks identified. The seismic constraints as well as licensing requirements, transportation issue and assembly process are also addressed. The IFMIF cryomodule presented here will be part of the Linear IFMIF Prototype Accelerator (LIPAc) whose construction is ongoing [1, 2]. It is a full scale prototype of one of the IFMIF accelerators, from the injector to the first cryomodule, aiming at validating the technical options for the future accelerator-based D-Li neutron source to produce high intensity high energy neutron flux for testing of candidate materials for use in fusion energy reactors. The cryomodule contains all the equipment to transport and accelerate a 125 mA deuteron beam from an input energy of 5 MeV up to 9 MeV. It consists of a horizontal cryostat of about 6 m long, 3 m high and 2 m wide, which includes 8 superconducting HWRs for beam acceleration working at 175 MHz and at 4.5 K, 8 power couplers to provide RF power to cavities, and 8 Solenoid Packages as focusing elements. OVERVIEW OF THE IFMIF LIPAC PROJECT The International Fusion Materials Irradiation Facility (IFMIF) aims at producing intense neutron fluxes so as to characterize materials envisioned for future fusion reactors. To this end, two identical Linacs, each accelerating a continuous-wave 125-mA deuteron beam at the final energy of 40 MeV, would be necessary to produce by break-up interactions of the D beam with the Li target the required 10 neutrons per seconds with the appropriate energy [3]. Because the accelerators have to reach unprecedented performances, the feasibility is being tested through the design, manufacturing, installation, commissioning and testing activities of a 1:1-scale prototype accelerator from the injector to the first cryomodule referred to as the Linear IFMIF Prototype Accelerator (LIPAc) shown in Figure 1. The IFMIF project is carried out under the framework of the Broader Approach Agreement between Europe and Japan. It is presently in its Engineering Validation and Engineering Design Activities (EVEDA), and the accomplishment in summer 2013, on schedule, of its Engineering Design Activities (EDA) allowed the successful development of the IFMIF Intermediate Engineering Design Report (IIEDR) [4]. The EU contributions to the LIPAc accelerator (CEASaclay, CIEMAT, INFN Legnaro and SCK-CEN Mol) are coordinated by the Fusion for Energy organization. The D injector and LEBT have been installed and are nowadays being tested on the Rokkasho site (JAEA) in Japan. Figure 1: IFMIF LIPAc accelerator.

Patent
15 Jan 2015
TL;DR: In this paper, a dual-coil solenoid is used for delivering an increased magnetic field to the soleneoid plunger when a fault is detected and it is desired to place the device into a tripped condition.
Abstract: A circuit interrupting device having a dual-coil solenoid for delivering an increased magnetic field to the solenoid plunger when a fault is detected and it is desired to place the device into a tripped condition. Independent switching devices control the flow of current through the respective coils of the solenoid and a third switching device controls the operation of the two coil driving switch devices. A detection circuit detects faults and controls the third switching device to activate the coil driving switching devices when a fault is detected. A programmable device runs a self-test program to determine whether the device is operating properly and faults can be detected. The programmable device can also indeendently control the operation of the two coil driving switching devices.