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Back J.,University of Warwick | Pozimski J.,Imperial College London | Savage P.,Imperial College London | Faircloth D.,Rutherford Appleton Laboratory | And 7 more authors.
IPAC 2010 - 1st International Particle Accelerator Conference | Year: 2010

The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory is intended to demonstrate the early stages of acceleration (0-3 MeV) and beam chopping required for high power proton accelerators, including proton drivers for pulsed neutron spallation sources and neutrino factories. A Low Energy Beam Transport (LEBT), consisting of three solenoids and four drift sections, is used to transport the H- beam from the ion source to the FETS Radio Frequency Quadrupole. We present the status of the installation and commissioning of the LEBT, and compare particle dynamics simulations with preliminary measurements of the H- beam transport through the LEBT. Source


Poncet L.,Fusion for Energy F4E | Bellesia B.,Fusion for Energy F4E | Oliva A.B.,Fusion for Energy F4E | Boter Rebollo E.,Fusion for Energy F4E | And 16 more authors.
Fusion Engineering and Design | Year: 2015

The ITER Toroidal Field (TF) magnet system consists of 18 "D" shaped coils. Fusion for Energy (F4E), the European Domestic Agency for ITER, is responsible for the supply of 10 out the 19 TF coils (18 installed plus one spare coil). Each TF coil, about 300 t in weight, is made of a stainless steel case containing a Winding Pack (WP).The European manufacturing of the Radial Plates (RPs) and WPs has been awarded to two different industrial partners, whose activities are strongly linked with each other. In order to manufacture a Double Pancake (DP), first, the conductor has to be bent onto a D-shaped double spiral trajectory, then heat treated and inserted in the grooves of the RP. This represents the most challenging manufacturing step: in order to fit inside the groove, the double spiral trajectory of the conductor must match almost perfectly the trajectory of the groove, over a length above 700. m. In order to achieve this, the conductor trajectory length must be controlled with an accuracy of 1. mm over a length of 350. m while the radial plate groove has to be machined with tolerances of ±0.2. mm over dimensions of more than 10. m. In order to succeed, it has been essential to develop a metrology process capable to control with high accuracy both the DP conductor and the RP groove trajectories.This paper reports on the work carried out on the development and qualification of the dimensional metrology to monitor the manufacturing of the conductor. Reference is made to the final dimensional check of the RP focusing on the groove centreline length. In addition the results obtained on the one to one scaled prototype DP are described. Finally, the strategy and foreseen improvements for the production of DPs are discussed. © 2015 Elsevier B.V. Source


Asua E.,University of the Basque Country | Etxebarria V.,University of the Basque Country | Garcia-Arribas A.,University of the Basque Country | Feutchwanger J.,University of the Basque Country | And 2 more authors.
Sensors (Switzerland) | Year: 2014

In many micro- and nano-scale technological applications high sensitivity displacement sensors are needed, especially in ultraprecision metrology and manufacturing. In this work a new way of sensing displacement based on radio frequency resonant cavities is presented and experimentally demonstrated using a first laboratory prototype. The principle of operation of the new transducer is summarized and tested. Furthermore, an electronic interface that can be used together with the displacement transducer is designed and proved. It has been experimentally demonstrated that very high and linear sensitivity characteristic curves, in the range of some kHz/nm; are easily obtainable using this kind of transducer when it is combined with a laboratory network analyzer. In order to replace a network analyzer and provide a more affordable, self-contained, compact solution, an electronic interface has been designed, preserving as much as possible the excellent performance of the transducer, and turning it into a true standalone positioning sensor. The results obtained using the transducer together with a first prototype of the electronic interface built with cheap discrete elements show that positioning accuracies in the micrometer range are obtainable using this cost-effective solution. Better accuracies would also be attainable but using more involved and costly electronics interfaces. © 2014 by the authors; licensee MDPI, Basel, Switzerland. Source


Asua E.,University of the Basque Country | Etxebarria V.,University of the Basque Country | Garcia-Arribas A.,University of the Basque Country | Feutchwanger J.,University of the Basque Country | And 2 more authors.
Proceedings of the 2013 5th IEEE International Workshop on Advances in Sensors and Interfaces, IWASI 2013 | Year: 2013

The performance and accuracy of micro- and nano-positioning systems are directly linked to the measurement device used to close the associated control loop. In this work we propose, design, and test an electronic interface for a new position and displacement transducer based on resonant cavities. This type of transducer has been proven to achieve resolutions in the nanometer range when the detection is performed using a laboratory network analyzer. The proposed electronic interface is intended to provide a more affordable and compact solution, while preserving as much as possible the excellent performance of the transducer, thus, turning it into a true standalone positioning sensor. The operation of the interface establishes a self-resonance in the cavities and detects the resonance frequency (which is directly related to the position to be measured) by analyzing the attenuation produced by a low pass filter. The results obtained in a prototype of the interface built with discrete elements show that the obtainable positioning accuracy using this cost-effective solution is about 5 micrometers. © 2013 IEEE. Source


Acosta L.,University of Huelva | Acosta L.,National Institute of Nuclear Physics, Italy | Bontoiu C.,University of Huelva | Martel I.,University of Huelva | And 4 more authors.
IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference | Year: 2014

Beam transport optics of the LINCE Linac experimental areas has been optimized for a few ion species using transfer matrix calculations performed in MAD-X. An alpha spectrometer based on a double bending achromat lattice has been used as dispersion suppressor. This optics design correspond to the first three planned beam lines. Further studies for the beam tracking and magnets design are being developed in order to conclude the whole design of this first LINCE phase. Copyright © 2014 CC-BY-3.0 and by the respective authors. Source

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