4 ms·
The 500TW are meaningless, the actual input is around 1.5MJ, meaning they got almost 80% of their input as energy back.
by zaarn 5y ago
The 500TW are meaningless, the actual input is around 1.5MJ, meaning they got almost 80% of their input as energy back.
- leephillips 5y agoWhere did you get this number? It’s a couple of orders of magnitude too low.
- zaarn 5y agohttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.245003 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12... This article mentions they used 1.5MJ of energy for the fusion process, it seems to be related to this news, on wikipedia you can find a cited NYTimes article stating 80% of the energy input was released. And I don't get where you get "couple order of magnitude too low" from, 500TW means nothing, it's a workload, not the total work the laser performed. Over a few nanoseconds, that checks out.
- leephillips 5y ago(1) That’s from 2018. (2) It does not say what you say it says. It does not state how much energy was “used”. The laser is about 1% efficient. (3) That 80%, which is the number that goes with this recent news, has nothing to do with the “energy input”. It is 80% of the energy that their models say was absorbed by the hohlraum. These are part of where my couple of orders of magnitude remark comes from.