December 07, 2022, 10:24:24 PM
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Topic: Tokamak produces radioisotopes  (Read 20693 times)

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Offline Enthalpy

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Re: Tokamak produces radioisotopes
« Reply #45 on: September 26, 2022, 05:16:45 AM »
A cyclotron for 500MeV protons isn't that big: D=6.6m H=2.9m on the appended sketch - unless beam focussing brings other constraints.

115kA per small lukewarm copper coil consume only 59kW together, while accelerating the protons for 1mol/year neutrons draw some 1.2MW at the plug. Bigger coils would reduce the 59kW or let increase the gap.

730t Fe cost ~1M€, as little as 100kW over 5 years.

A smaller cyclotron needs more than 1.8T, hence without iron, and the consumption jumps. 4T at the centre need 2×2.2MA. Pure Al at 20K and 60kOe resists 76pΩ×m, so each coil dissipates 52kW at 20K, and the cooler evacuates 5.6MW: as expensive in a month as iron costs once. The power is only proportional to the induction since the dimensions vary too. 6T at the rim limit the coils' size, which I didn't check as it won't improve much the consumption.

Maybe superconductors do that better, I can't tell. The unshielded field remains badly dangerous.

Marc Schaefer, aka Enthalpy

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