Sensor for detecting changes in magnetic fields
AssigneeThe United States of America as represented by the United States Department of Energy
InventorWalter F. Praeg
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Abstract
A sensor for detecting changes in the magnetic field of the equilibrium-field coil of a Tokamak plasma device comprises a pair of bifilar wires disposed circumferentially, one inside and one outside the equilibrium-field coil. Each is shorted at one end. The difference between the voltages detected at the other ends of the bifilar wires provides a measure of changing flux in the equilibrium-field coil. This difference can be used to detect faults in the coil in time to take action to protect the coil.
Claims4
A sensor for detecting changes in magnetic flux in an equilibrium-field coil in a Tokamak plasma device comprising:
- a first bifilar wire disposed inside and parallel to a turn of the equilibrium-field coil in sensing proximity to the equilibrium-field coil;
- a short circuit applied at a first end of the first bifilar wire across the wires thereof;
- a second bifilar wire disposed outside and parallel to the turn of the equilibrium-field coil in sensing proximity to the equilibrium-field coil;
- a short circuit applied at a first end of the second bifilar wire across the wires thereof at a location corresponding to the short circuit at the first end of the first bifilar wire;
- and
- control means connected across the wires at a second end of the first bifilar wire and across the wires at a second end of the second bifilar wire to obtain a difference voltage of voltages generated in the first and second bifilar wires, which difference voltage is a measure of change in magnetic flux in the equilibrium-field coil.
Dependencies are inferred from the claim text.