Adjustment method and electron beam device
An adjustment method for adjusting a path of an electron beam passing through an electron beam device including at least one unit having at least one lens and at least one aligner electrode, and a detector configured to detect the electron beam, the method including: a step of measuring, by a coordinate measuring machine, an assembly tolerance for each of a plurality of the units constituting the electron beam device; a step of determining a shift amount of the electron beam at a position of the at least one of the lenses; a step of determining an electrode condition for each of a plurality of the aligner electrodes included in the units in a manner such that a shift amount of the electron beam is to be the determined shift amount; and a step of setting each of the aligner electrodes to the corresponding determined electrode condition.
1. An adjustment method for adjusting a path of an electron beam passing through an electron beam device including at least one unit having at least one lens and at least one aligner electrode, and a detector configured to detect the electron beam, the method comprising:
a step of measuring, by a coordinate measuring machine, an assembly tolerance for each of a plurality of the units constituting the electron beam device;
a step of determining, in consideration of the assembly tolerance for each of the units in a manner such that the electron beam passes through the center of at least one of a plurality of the lenses, a shift amount of the electron beam at a position of the at least one of the lenses;
a step of determining an electrode condition for each of a plurality of the aligner electrodes included in the units in a manner such that a shift amount of the electron beam is to be the determined shift amount; and
a step of setting each of the aligner electrodes to the corresponding determined electrode condition.
2. The adjustment method according to claim 1 , further comprising a step of adjusting, after the setting each of the aligner electrodes to the corresponding determined electrode condition, the corresponding electrode condition for each of the aligner electrodes in a manner such that an image of the electron beam obtained by the detector is not changed although a condition for each of the lenses is changed.
3. The adjustment method according to claim 1 , wherein
when the aligner electrode is an electric field aligner, a correspondence relation between the shift amount of the electron beam at the position of the at least one of the lenses and a voltage between electrodes of the aligner electrode is predetermined, and
in the step of determining the electrode condition, by applying the shift amount of the electron beam at the position of the lens to the correspondence relation, the voltage between the electrodes of the aligner electrode is determined as the electrode condition.
4. The adjustment method according to claim 1 , wherein
when the aligner electrode is a magnetic field aligner, a correspondence relation between the shift amount of the electron beam at the position of the at least one of the lenses and a current applied to the aligner electrode is predetermined, and
in the step of determining the electrode condition, by applying the shift amount of the electron beam at the position of the lens to the correspondence relation, the current applied to the aligner electrode is determined as the electrode condition.
5. An electron beam device comprising:
at least one unit having at least one lens and at least one aligner electrode;
a detector configured to detect an electron beam; and
a controller configured to perform control to determine, in consideration of an assembly tolerance, the assembly tolerance measured by a coordinate measuring machine, for each of a plurality of the units constituting the electron beam device, in a manner such that the electron beam passes through the center of at least one of a plurality of the lenses, a shift amount of the electron beam at a position of the at least one of the lenses, to determine an electrode condition for each of a plurality of the aligner electrodes included in the units in a manner such that a shift amount of the electron beam is to be the determined shift amount, and to set each of the aligner electrodes to the corresponding determined electrode condition.