In reply to delt0r the tokamaks don’t do all that well in the metric that really counts which is total fusion energy out over total (or “wall-plug”) energy in. For DD the best results in tokamak are 1 joule of fusion for 100,000 joules of total input. The best results for dense plasma focus (not ours yet!) are almost exactly the same. DPFs cost about 1,000 times less than tokamaks. The fusion effort would have been much less costly if funds had been spread over a wide range of devices, rather than concentrated on one–the most expensive.
