This listing is for a VARIAN V3400 MAGNET SYSTEM and with the FIELDIAL MARK I REGULATOR as can be seen in the pictures.
A Fieldial uses a Hall probe to regulate the magnetic field to a strength you choose by changing the current going to the magnet.
With this Fieldial Mark I you have the current regulator which keeps the current at the constant level you choose.
From what we were told it creates a uniform magnetic
field up to 1.4 Teslas.
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These magnets were designed for nuclear magnetic
resonance experiments.
Please check manufacturer's Specification Technical Data Sheet of a similar unit to this one by clicking HERE!!!
It is of the typical H-frame design. Slight modifications were made to utilize the V-3400. Mounting the magnet sideways on a table created a horizontal gap at a reasonable work height. New pole tips were machined from 1020 rolled steel into cylinders, maximizing the diameter. The poles are nine inches in diameter and create a gap of 2.1875 inches. The maximum field obtainable from this geometry is 1.2 Tesla. The operating field value was determined by the oscillator. For reasons that will be discussed later the operating frequency is 13.56+0.03 MHz. Using the cyclotron frequency relationship:
f qB/2p m
a magnetic field of 0.889 Tesla was determined to be the operating field value. This was a welcome operating value, as the magnet need only be run at 70 percent of its maximum values, reducing the chance of coil failure by pressing the tolerances.
The magnet weighs 1780 pounds, it requires 40 volts at 168 amps, 7Kilowatts, to produce the maximum field of 1.2 Tesla. Only 28 volts at 114 amps, 3.2 kW, is required at the operating value of 0.889 Tesla. Water cooling is used to remove the heat generated by the coils, the inlet pressure is approximately 38 PSI and flow rate is no less than 4 GPM. The pressure is controlled with an inline pressure regulator and the flow rate is monitored with an impeller driven magnetic pick-up digital flow meter.
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