2. How large was this reaction? Usually in this type of experiments we are talking very small amounts, nanograms or less.
The fusion took place in a near vacuum. But to a physicist, vacuums are relative. To a physicist, it isn't important whether the fusion took place at 1 Pascal, or 1 micro-Pascal. To a physicist, it isn't important whether it would - in practical terms - be easy or difficult to actually harvest that energy. He is elated that he succeeded in attaining controlled fusion. That is all that matters to him.
Yes, I suppose that only nanograms of matter were actually fused - though that would still yield / release a considerable amount of energy (which might even - if practically harvestable - be approx. equal to the amount needed to run the set-up, meaning that it would then be self-sustaining).
Regards,
“. I assume this was doin in a vacuum so the question is how do you extract the energy?”
It was done in a Hoover upright and the energy was extracted by emptying the bag.