Gating device and driver for modulation of charged particle beams
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsRichard N. Zare, Facundo M. Fernandez, Joel R. Kimmel, Oliver Trapp
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Abstract
By connecting the Bradbury-Nielson gate (BNG) directly to a driver without a transmission line, distortion of the voltage waveform experienced a the BNG are much reduced. Because the magnitude of the modulation defects grows as the applied modulation voltage is increased, Bradbury-Nielson gates with finer wire spacing such as 100 microns, and operating at 10 to 15 V, significantly better signal-to-noise ratios are achieved. HT-TOFMS data were also post processed using an exact knowledge of the modulation defects.
Claims13
An analytical instrument, comprising:
- a BNG gate comprising an array of conductors;
- a BNG driver generating and applying electrical potentials to the conductors to control passage of a stream of charged particles through the gate to enable analysis of the particles;
- and
- a substrate supporting both the gate and the driver a housing defining a vacuum chamber therein containing the gate, driver, and substrate.
An analytical instrument, comprising:
- a BNG gate comprising an array of conductors substantially parallel to one another and at a spacing of not more than about 300 microns between adjacent conductors;
- and
- a BNG driver applying electrical potentials with respect to a reference potential of magnitude not more than about 30 volts to the conductors to control passage of a stream of charged particles through the gate to enable analysis of the particles a substrate supporting both the gate and the driver, said driver generating the electrical potentials applied to the conductors, a housing defining a vacuum chamber therein containing the gate, driver, and substrate.
Dependencies are inferred from the claim text.