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http://documenta.ciemat.es/handle/123456789/31
2024-03-19T05:38:44ZA Novel Ground Fault Detection Method for 2020 Electric Vehicle Powertrains Based on a Grounding Resistor Voltage Analysis
http://documenta.ciemat.es/handle/123456789/2612
Title: A Novel Ground Fault Detection Method for 2020 Electric Vehicle Powertrains Based on a Grounding Resistor Voltage Analysis
Authors: Guerrero, J.M.; Navarro, Gustavo; Platero, Carlos A.; Tian, P.; Blázquez, Francisco
Abstract: The growing adoption of electric vehicles has recently attracted increasing attention of scientists and brought about pioneering research studies from various fields. Safety concerns particularly those regarding ground faults detection and protection, have extensively been addressed. Ground faults occur quite frequently in electric vehicles and they may be due to severe operation conditions, such as vibrations, twists or even crashes. Generally, the first ground fault is not dangerous, since the powertrain systems, namely, the dc bus where the batteries are connected, the power inverter and one or more ac machines, are generally ungrounded. The second ground fault, however, can produce malfunction in some systems, power loss or even serious damages. Locating the fault has often proved hard and time consuming. For this reason, the present study focuses on developing a ground-fault detection method for electric vehicles capable of determining on which side, the dc or the ac, the ground fault is located. The method is based on the analysis of the voltage in a grounding resistor connected between the midpoint of the battery pack and ground. Based on the polarity and harmonics, it is possible to locate the ground fault. This method has been verified excellent results have been achieved using computer simulations and experimental tests in a 140-kW electronic power inverter fed by a 480 Vdc battery.2024-02-12T00:00:00ZExperimental characterization of the internal ion source for the AMIT compact cyclotron
http://documenta.ciemat.es/handle/123456789/2594
Title: Experimental characterization of the internal ion source for the AMIT compact cyclotron
Authors: Calvo, P.; Obradors, D.; Varela, R.; Podadera, I.; Oliver, C.; Estévez, A.; Domínguez, M.; Vázquez, C.; Toral, F.; García-Tabarés, L.; Pérez, J.M.
Abstract: The ion source is one of the most relevant elements in a cyclotron, since it determines the injection into the accelerator. An internal cold-cathode Penning ion source has been chosen for the AMIT compact cyclotron. This kind of source is extensively used in cyclotrons to produce negative hydrogen ions. The compactness of the accelerator constrain the beam diagnostic in the cyclotron, motivating the development of an external experimental facility for the commissioning of the ion source. In this paper, the validation of the ion source design and the characterization of the H
beam production are presented. Different chimney geometries modifying the distance between the plasma column and the extraction wall have been tested to obtain the best relation between ion production and plasma conditions. In addition, experimental measurements of the beam profile have been carried out. Current experimental results provide relevant information for the operation in the final cyclotron assembly and the final beam current optimization.2024-02-12T00:00:00ZPreliminary design of the HEBT of IFMIF DONES
http://documenta.ciemat.es/handle/123456789/2587
Title: Preliminary design of the HEBT of IFMIF DONES
Authors: Nomen, O.; Sánchez-Herranz, D.; Oliver, C.; Podadera, I.; Varela, R.; Ogando, F.; Hauer, V.; Arranz, F.; Coloma, S.; Heidinger, R.; Dzitko, H.
Abstract: IFMIF-DONES (International Fusion Materials Irradiation Facility – DEMO Oriented Neutron Source) is currently being developed in the frame of the EUROfusion Early Neutron Source work package (WPENS) and will be an installation for fusion material testing, that will generate a flux of neutrons of 1018 m−2s−1 with a broad peak at 14 MeV by Li(d,xn) nuclear reactions thanks to a 40 MeV deuteron beam colliding on a liquid Li flow.
The accelerator system is in charge of providing such high energy deuterons in order to produce the expected neutron flux. The High Energy Beam Transport line (HEBT) is the last subsystem of the accelerator and its main functions are to guide the deuteron beam towards the Lithium target and to shape it by the use of magnetic elements to the reference beam footprint at the Lithium Target.
The present work summarizes the current status of the HEBT design, including beam dynamics, vacuum, radioprotection, diagnostics and remote handling studies performed, along with the layout and integration of the line.2024-02-11T00:00:00ZMagnetic and Mechanical Design of a 16 T Common Coil Dipole for FCC
http://documenta.ciemat.es/handle/123456789/2576
Title: Magnetic and Mechanical Design of a 16 T Common Coil Dipole for FCC
Authors: Toral, Fernando; Munilla, Javier; Salmi, Tiina
Abstract: A EuroCirCol is a conceptual design study for a post-LHC research infrastructure based on an energy-frontier 100 TeV circular hadron collider. In the frame of the high-field accelerator magnet design work package of this study, the feasibility of a 16 T dipole in a common coil configuration is being studied. This paper shows the electromagnetic design optimization performed to achieve the required field quality while minimizing the superconductor volume and taking into account the input parameters and assumptions of the EuroCirCol study. The finite element models have been used to analyze the stress distribution and deformations under the large Lorentz forces due to the very high magnetic field. Several iterations have been necessary to obtain a feasible magnet design. The 3-D electromagnetic calculations are also included in this paper.2018-01-25T00:00:00Z