High-speed particle detector for discriminating charge states of ions

摘要

Detected ion charge states are discriminated in a mass spectrograph using a superconducting stripline detector (SSLD) as the detector thereof. A set of mass spectra of the singly charged or higher ions, the doubly charged or higher ions, the triply charged or higher ions (and successively higher ion charge states) are determined by measuring the mass spectra successively while decreasing the bias current flowing through the superconducting stripline detector. Then, the data of singly charged ions alone can be determined by subtracting the data of the doubly charged or higher ions from the data of the singly charged or higher ions. In a similar manner, the data of doubly charged ions alone, the data of triply charged ions alone (and similarly successively multiply charged ions) can also be determined.

主权项

1. A particle detector with a superconducting stripline detector that is impacted with multiple particles and counts the multiple particles in accordance with hot spots induced locally in a superconductor by an impact of the particles,
wherein a detectable range of charge states is selectable, wherein the superconducting stripline detector includes a superconducting stripline that is adapted to allow passage of a bias current that is lower than a superconducting critical current of the superconducting stripline, wherein the critical current is a current at or above which a resistance appears, and wherein the bias current selects a detectable particle kinetic energy range by changing the bias current.