TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A coil that produces a magnetic field parallel to an electron beam for the purpose of focusing the beam.  2, record 1, English, - focusing%20coil

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Concentration d'un faisceau électronique sous l'effet d'un champ magnétique.  2, record 2, French, - concentration%20magn%C3%A9tique

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

An external structure that provides the magnetic fields required for focusing, alignment and deflection.  1, record 3, English, - yoke%20assembly

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Dispositif externe qui produit les champs magnétiques nécessaires à la concentration, à l'alignement et à la déviation.  1, record 3, French, - bloc%20de%20bobinage

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A device for focusing beams of charged particles which has four electrodes or magnetic poles of alternating sign arranged in a circle about the beam; used in instruments such as electron microscopes and particle accelerators.  1, record 4, English, - quadruple%20lens

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

[...] la focalisation forte à gradients alternés, récemment découverte, a été appliquée aux accélérateurs linéaires, et leur construction en exploite maintenant largement le principe [...] Dans chaque tube de glissement est disposé un électro-aimant à quatre pôles, appelé lentille quadripolaire. Par une disposition et une orientation convenables des champs magnétiques de ces lentilles, il est possible d'obtenir un effet focalisant extrêmement intense tel que, pratiquement, la focalisation ne provoque la perte d'aucune particule.  1, record 4, French, - lentille%20quadripolaire

Record number: 4, Textual support number: 1 OBS

électroaimant : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).  2, record 4, French, - lentille%20quadripolaire

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

High-altitude atmospheric wave produced by auroral heating and propagated from high latitudes towards the equator.  3, record 5, English, - travelling%20ionospheric%20disturbance

Record number: 5, Textual support number: 1 CONT

Travelling ionospheric disturbances... are probably a cause of focusing and defocusing of radio waves. The disturbance usually appears at higher frequencies, gradually affecting lower frequencies. Some are associated with magnetic storms and originate in the auroral zone. These may travel great distances. Others appear to be more localised, originating in the troposphere in local weather.  4, record 5, English, - travelling%20ionospheric%20disturbance

Record number: 5, Textual support number: 2 CONT

Travelling Ionospheric Disturbance (TID) is a ripple or wave in the electron density structure that propagates horizontally which affects the refraction of radiowaves and so degrades directional finders. There are two main types: .large-scale TID with 1000 km or more between wave crests usually moving from pole to equator and generated by auroral activity; .medium-scale TID with hundreds of km wavelengths thought to be generated by thunderstorm activity.  5, record 5, English, - travelling%20ionospheric%20disturbance

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 DEF

Onde atmosphérique de haute altitude produite par un réchauffement auroral et qui se propage des latitudes élevées vers l'équateur.  3, record 5, French, - perturbation%20ionosph%C3%A9rique%20migratoire

Record 5,  Textual support,  Spanish

Record number: 5, Textual support number: 1 DEF

Onda atmosférica a niveles altos que se propaga desde las latitudes altas hacia el Ecuador, originada por el calentamiento producido por las auroras.  1, record 5, Spanish, - perturbaci%C3%B3n%20m%C3%B3vil%20en%20la%20ionosfera

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

A permanent magnet used to produce a magnetic field for focusing an electron beam.  2, record 6, English, - focusing%20magnet

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 CONT

Le LEP est un anneau géant installé dans un tunnel de 27 kilomètres de circonférence [...] L'enceinte est placée dans l'entrefer d'électro-aimants : 1 272 aimants de focalisation [...] et 3 400 aimants de courbure concentrent et guident les faisceaux.  1, record 6, French, - aimant%20de%20focalisation

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 DEF

A configuration of transverse electric or magnetic fields suitable for focusing or confining a charged-particle beam in which successive magnets or electrodes(in time or along the beam direction) have opposite polarity.  4, record 7, English, - alternating%2Dgradient%20focusing

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 CONT

Focalisation forte. (...) si l'on construit un champ dans lequel n prend alternativement des valeurs positives et négatives assez grandes, permettant ainsi à la particule qui y parcourt une orbite circulaire de rayon r d'y rencontrer successivement des secteurs dans lesquels le champ magnétique la focalise dans un plan horizontal, et la défocalise verticalement, et des secteurs où c'est l'inverse qui se produit, il peut en résulter une action nettement focalisatrice tant radialement que le long des lignes du champ. Cette focalisation est connue sous le nom de "focalisation à gradient alterné" (A.G.).  3, record 7, French, - focalisation%20par%20alternance%20de%20gradients

Record number: 7, Textual support number: 2 CONT

La découverte, en 1950, de la focalisation forte, dite à gradients alternés, a facilité la construction des grands accélérateurs circulaires.  2, record 7, French, - focalisation%20par%20alternance%20de%20gradients

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 CONT

One of the chief problems in any accelerator system is that of maintaining spatial control over the beam; this requires some form of focusing.... A wide variety of focusing principles and devices are used in different accelerator types. The natural bowing-out of magnetic field lines in a cyclotron magnet results in a net focusing action... ;so also does the electrostatic field line configuration between drift tubes of many simple linear accelerators. But these systems are classed generally as "weak-focusing" approaches.  1, record 8, English, - weak%2Dfocusing

Record 8,  Textual support,  French

Record 8,  Textual support,  Spanish