Patent ID: 6707034
Filing Date: 2004-03-16
Classification: H01J

Abstract:
An ion detector comprising:an ion input face formed with an ion input opening; a Faraday cup having an ion collection surface that confronts the ion input opening; an ion-to-electron converter dynode disposed to one side with respect to the Faraday cup and the ion input opening, the ion-to-electron converter dynode having a conversion surface that converts impinging ions into electrons; two ion deflection electrodes that generate an electron lens that attracts and focuses ions from the ion input opening toward the conversion surface of the ion-to-electron converter dynode; an electron multiplier portion that receives and multiplies the electrons from the ion-to-electron converter dynode, the electron multiplier portion including a plurality of dynodes that multiply electrons one after the other, the plurality of dynodes being juxtaposed in an arc-shape around the Faraday cup; and an anode that receives electrons from the electron multiplier portion and that outputs a signal that corresponds to the amount of input ions.