Rf power supply for a mass spectrometer

Details Rf power supply for a mass spectrometer Rf power supply for a mass spectrometer

H - Electricity

01

J

H01J 49/42 (2006.01)

Patent

CA 2572553

The present invention provides a radio frequency (RF) power supply in a mass spectrometer. The power supply provides an RF signal to electrodes of a storage device to create a trapping field. Such ion storage devices are often used to store ions prior to ejection to a subsequent mass analyser. The RF field is usually collapsed prior to ion ejection. The present invention provides a RF power supply comprising: a RF signal supply, a coil arranged to receive the signal provided by the RF signal supply and to provide an output RF signal for supply to electrodes of an ion storage device, and a shunt including a switch operative to switch between a first open position and a second closed position in which the shunt including a switch operative to switch between a first open position and a second closed position in which the shunt shorts the coil output.

L'invention porte sur l'alimentation RF d'un spectromètre de masse fournissant un signal RF aux électrodes d'un dispositif de stockage d'ions de manière à créer un champ de piégeage. De tels dispositifs de stockage sont souvent utilisés pour stocker des ions avant leur éjection vers l'analyseur de masse, et le champ RF est usuellement supprimé avant l'injection des ions. Ladite alimentation RF comprend: une source de signal RF; une bobine recevant le signal RF et émettant un signal RF alimentant les électrodes du dispositif de stockage d'ions; et un shunt comportant un commutateur pouvant passer d'une première position d'ouverture à une deuxième position de fermeture où le shunt court-circuite l'émission RF de la bobine

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