Automatic gain control (agc) method for an ion trap and a...

Details Automatic gain control (agc) method for an ion trap and a... Automatic gain control (agc) method for an ion trap and a...

H - Electricity

01

J

H01J 49/00 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2731712

An automatic gain control (AGC) technique and apparatus is introduced herein for any temporally non-uniform ion beam, such as, for example, an ion beam produced by a MALDI ion source so as to minimize space charge effects. The disclosed configurations and techniques can be achieved by using an ion optical gating element and applying a desired signal waveform (e.g., a square wave) having a predetermined duty cycle. The applied voltage amplitude of such a signal can be configured to switch between a voltage which fully transmits the ions, and a voltage which does not transmit any ions. The frequency is chosen to result in a period which is significantly lower than the smallest non- uniformity period. Techniques of the present invention can also be extended to methods of AGC which can use a single ion injection event from the ion source to avoid variations in ion numbers from an unstable ion source.

Linvention concerne une technique et un appareil de commande de gain automatique (CGA) destinés à un faisceau ionique temporellement non uniforme, par exemple un faisceau ionique produit par une source dions MALDI, de manière à minimiser les effets de charge spatiale. Ces configurations et ces techniques peuvent être obtenues en utilisant un élément de grille optique pour ions et en appliquant une forme donde de signal voulue (par exemple, une onde carrée) ayant un cycle de service prédéterminé. Lamplitude de tension appliquée dun tel signal peut être configurée de manière à effectuer une commutation entre une tension transmettant pleinement les ions et une tension ne transmettant aucun ion. La fréquence est choisie de manière à obtenir une période qui est sensiblement inférieure à la période de non-uniformité la plus petite. Les techniques de la présente invention peuvent également sétendre aux procédés de CGA qui peuvent nutiliser quun seul événement dinjection dions depuis la source dions afin déviter des variations du nombre dions provenant dune source dions instable.

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