HEDP notes

go back

high energy density plasma is a plasma with pressure above 1 MBar

[math]1 MBar = 1 \times 10^6 \times 10^5 Pa = 10^{11} Pa = 10^{11} (N m)/(m^2) = 10^{11} J/m = 10^{11} (10^7 erg)/(10^6 cm^3) = 10^{12} erg/cm^3[/math]

magnetic field produced by single wire (Biot-Savart Law)

[math]B[G] = 0.2 \times I(A) / r(cm) [/math]
[math]B[T] = 0.2 \times I(kA) / r(mm) [/math]

• 10 MA at 4 mm radius is 500 T
• 100 kA at 40 um radius is 500 T
• 160 kA at 5 um radius is 6,400 T

magnetic pressure

[math] P_m(bar) = 4 \times B(T)^2 [/math]
[math] P_m(bar) = 0.16 \times I(kA)^2 \times R(mm)^{-2} [/math] 

• 10 MA at 4 mm radius is 1 MBar
• 100 kA at 40 um radius is 1 MBar
• 160 kA at 5 um radius is 164 MBar

Bennett condition

• magnetic pressure = plasmakinetic pressure

• 14 MBar at 140 kA at 15-um radius (shot 634 with 2x30-um W wires)
• 25 MBar at 150 kA at 12-um radius (shot 657 with 2x30-um Mo wires)
• 100 MBar at 154 kA at 6-um radius (shot 657 with 2x30-um Mo wires)

Links

• Frontiers in High Energy Density Physics THE X-GAMES OF CONTEMPORARY SCIENCE