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Technical Examples
A beam current measuring device (BMD) capable of measuring beam current while radiating the beam on a target, such as a semiconductor wafer. The BMD at least includes: (a) a detecting part operable to detect or collect a magnetic field corresponding to the beam current; and (b) a measuring part including (i) a SQUID sensitive to magnetic flux, and (ii) a feedback coil operable to carry feedback current wherein the feedback current is operable to cancel out a change in the magnetic flux penetrating through the SQUID. Wherein the operating point of the SQUID is set according to a finite beam current value, other than zero, which penetrates through the detecting part.