EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE IRON CORE TRANSFORMER FOR THE EXTRAP T-1 DEVICE
The possibility of driving the discharge current of the toroidal EXTRAP T1 device, using the iron core transformer, is investigated. It is shown that the breakdown voltage 20 kV can be supplied, along the zero line of the vacuum magnetic field, at a time shorter than 1 microseconds. This is made possible by the transient build-up of the magnetic field in the iron core laminations. The plasma current rise time is determined by the evolution of the inductance and resistance of the discharge. This enables the plasma current to be built up to an amplitude I-p = 50 kA within 10-15 microseconds and sustained at this value during a steady state period of 100 microseconds. The premagnetized iron core of the cross-sectional area 0.16 m**2 is sufficient to provide the necessary flux swing, if the saturation induction is not lower than 1 T. It is further concluded that the SiFe lamination is adequate for the present application. However, to reduce the stray field interfering with the zero line of the octupole field, a lamination of thickness d < 0.1 mm with high resistivity should be employed. The interlamination voltage should be reduced by segmenting the core. The steady rate is supplied by an 0.4 OMEGA, 20 kV artificial line consisting of 20 muF capacitive elements.
Bibliographic Reference: WRITE TO DEPARTMENT OF PLASMA PHYSICS AND FUSION RESEARCH, ROYAL INSTITUTE OF TECHNOLOGY, S-100 44 STOCKHOLM 70 (SWEDEN), MENTIONING REPORT TRITA-PFU-83-08, 1983
Record Number: 1989122042700 / Last updated on: 1987-01-01
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