Charged particle beam device and spherical aberration correction method
First Claim
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1. A charged particle beam device comprising:
- a charged particle beam source;
a charged particle optical system that irradiates a specimen with charged particle beams which are formed of charged particles released from the charged particle source;
an objective lens that focuses the charged particle beams;
a spherical aberration corrector that satisfies a magnetically saturated state in multiple aberration correction conditions by selectively magnetizing multiple sets of pole groups of a multipole lens according to a change in magnetization current of the objective lens; and
a control unit that controls the charged particle optical system and the spherical aberration corrector.
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Abstract
In general, in a multipole lens of an aberration corrector of a charged particle beam device, there is only one condition that can be set where both a spherical aberration correction condition and magnetic saturation are satisfied. Therefore, a plurality of acceleration voltages cannot be handled. Consequently, the present invention provides a spherical aberration corrector that satisfies the magnetic saturation state for a plurality of aberration correction conditions by selectively magnetizing a plurality of pole groups of the multipole lens according to the changes in the objective lens magnetization current.
13 Citations
12 Claims
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1. A charged particle beam device comprising:
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a charged particle beam source; a charged particle optical system that irradiates a specimen with charged particle beams which are formed of charged particles released from the charged particle source; an objective lens that focuses the charged particle beams; a spherical aberration corrector that satisfies a magnetically saturated state in multiple aberration correction conditions by selectively magnetizing multiple sets of pole groups of a multipole lens according to a change in magnetization current of the objective lens; and a control unit that controls the charged particle optical system and the spherical aberration corrector. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A spherical aberration correction method of a charged particle beam device including a charged particle beam source;
- a charged particle optical system that irradiates a specimen with charged particle beams which are formed of charged particles released from the charged particle source;
an objective lens that focuses the charged particle beams;
a spherical aberration corrector that corrects a spherical aberration of the charged particle optical system; and
a control unit that controls the charged particle optical system and the spherical aberration corrector,wherein the control unit satisfies a magnetically saturated state in multiple aberration correction conditions by selectively magnetizing multiple sets of pole groups of a multipole lens according to a change in magnetization current of the objective lens. - View Dependent Claims (8, 9, 10, 11, 12)
- a charged particle optical system that irradiates a specimen with charged particle beams which are formed of charged particles released from the charged particle source;
Specification