Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Beam of atomic particles
Patent
1984-09-28
1987-08-18
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Beam of atomic particles
324127, 336225, 336229, 336DIG1, G01R 1900
Patent
active
046879870
ABSTRACT:
A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.
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Kuchnir Moyses
Mills Frederick E.
Baker Stephen M.
Eisenzopf Reinhard J.
Gottlieb Paul A.
Hightower Judson R.
The United States of America as represented by the United States
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