Conclusions from anode design study
(0) CommentsWe have competed preliminary anode design studies. These indicate that for copper, stress limits will not be exceeded as long as current at the base of the electrode does not exceed 0.75MA per cm of anode radius. Interestingly enough, this is exactly the same as the “rule of thumb” limit, based on experimental experience, that was previously formulated by Bruce Freeman of Texas AM.
To achieve higher run-down velocities, a 2-1 taper should be possible. So, for example, with copper a 1.5MA device could have a cathode radii of 5 cm and anode tapering from 2 cm to 1 cm radius. This means that plasmoids produced with copper electrodes will have a maximum magnetic field of 6GG.
For beryllium electrodes, which have higher strength, the situation is almost exactly a factor of two better. A 1.5 MA device with Be electrode would have a cathode radius of 2.5 cm. The limiting plasmoid magnetic field for these electrodes will be 12GG.
So the anode studies indicate that the magnetic field used in the simulations should be achievable without over-stressing the electrodes.
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