Reply To: Bang or no bang
The Focus Fusion Society › Forums › Aneutronic Contenders › Tri Alpha Presentations – Wow – but not aneutronic › Reply To: Bang or no bang
jamesrmalaga2022 wrote: What is the percentage of laser that is scattered by the plasma?
Magnetically confined plasmas are at such a low density that the chance of a photon scattering is incredibly small.
Typically for a Thomson scattering laser system you’d get back 1 photon for every 10^14 – so if the laser pulse is 3GW around 30 micro Watts get back to the detector.
or in percentage terms 0.0000000000001%
I’m not sure what you mean by the rest of your comment??
This give a bit more background on the systems used at MAST, JET and what is proposed for ITER
http://www-fusion-magnetique.cea.fr/ppe/TrainingWeekCulham/OpticalDiagnostics-ScatteringDiagnostics-MarkKempenaars.ppt.
The Tri-alpha plasma will be a little bit denser than a tokamak, so they can get away with a slightly less powerful laser, but the fundamentals are the same.