The numbers (apart for the final Triple product) achieved by Venti are from the JASON review paper.charliem wrote: ↑Tue Apr 18, 2023 5:20 pmSkipjack offered that Helion reached a triple product of 1E+22 eV*s/m3 with Venti. As far as I know, Venti did B=8T max, β around 1, and accepting ηei=1/8 (given that plasma temp only reached 2 keV, it was probably less, but that would not change the result much). From those figures we obtain: n*T = 1.5E+30. Dividing triple product by n*T gives τ_N = 0.08 ms.
We know the real time was 40 microseconds, so there's a factor of 2 difference between calculated and experimental data. It would be nice to find out where is the mistake in my calculations.
Those numbers were:
8 * 10^22 density, 2keV temperature and 40 microseconds confinement time
That would be a Triple product of 6.4 * 10^18 keV * s/m3
However those numbers were before the final campaign which improved on those numbers to a triple product of over 10^19 keV s/m3
But I only know the triple product and not the values for density, confinement time and temperature.
I am not sure how you are calculating the
The 9 keV are from the 2020 campaign where Trenta still only had a B field of 7 Tesla (yes, less than Venti!).
From my understanding, Trenta was later updated with stronger magnets (don't know the field strength), but the numbers achieved with those are not public yet. David Kirtley told me that they are putting together another paper for JOFE, but that is still in peer review. Not sure if it will have the latest results from Trenta, though.
Either way, a triple product somewhere in the mid 10^20 keV s /m3 range is roughly what I estimated for Trenta's 2020 campaign.
We do not know the exact measurements of Trenta nor Venti. So some things are hard to calculate. I know that Trenta was 3 times the radius and 30 times the volume of Venti.
Confinement time scales with radius^2.1 so we get about 0.4 ms from just that. So close to 0.5 ms.