Abstract:
PROBLEM TO BE SOLVED: To provide a technique advantageous in reducing a measurement error due to a positional shift of a knife edge.SOLUTION: A charged particle beam device including an irradiation unit for irradiating a subject with a plurality of charged particles beams includes: a measuring instrument for measuring characteristics of the plurality of charged particle beams; and a control unit. The measuring instrument includes: a plate which has a plurality of knife edges; and a sensor which detects charged particle beams entering through the plate. The control unit scans one charged particle beams selected from the plurality of charged particle beams relative to the measuring instrument so that the one charged particle beam crosses at least two knife edges among the plurality of knife edges, and generates correction information for correcting a measurement error of the measuring instrument due to deformation of the plate based upon output of the sensor during the scanning.
Abstract:
PROBLEM TO BE SOLVED: To enable an ion beam in an ion beam system having a scanning deflector to be deflected with high accuracy at a high deflection frequency (high speed) and without expanding the dynamic range of a deflection voltage in both high energy and low energy operation modes.SOLUTION: A deflector 39 is composed of three deflection electrode pairs consisting of first deflection electrodes 51a, 51b and 51c disposed at given intervals in the direction of an optical axis 5 of an ion beam 19 and second deflection electrodes 52a, 52b and 52c opposing the foregoing, and is so designed that different electric potentials can be applied to each deflection electrode from a controller 7 via a switch 61. In a first operation mode (for example, 30 keV ion beam energy), a deflection electric field is generated for all of the deflection electrode pairs, as shown by an arrow 55. In a second operation mode (for example, 1 keV ion beam energy), a deflection electric field is generated for only the deflection electrode pair 51a and 52a.
Abstract:
PROBLEM TO BE SOLVED: To provide a high speed and high voltage DA conversion device.SOLUTION: A DA conversion device 10 having a current output type DA converter 11, a low voltage operation type high speed operational amplifier 12 for generating a voltage corresponding to an output current of the DA converter, and a high voltage operation type buffer amplifier 13 connected to an output terminal of the high speed operational amplifier comprises positive and negative floating power supplies 14a, 14b separated from a power system as power supplies for driving the DA converter and the high speed operational amplifier. Midpoint potential portions of the floating power supplies are connected to an output terminal of the buffer amplifier, so that the DA converter and the high speed operational amplifier operate with an output voltage of the buffer amplifier being as a center.