Computational Modeling of Magnetic Intervention. D. V. Rose* Voss Scientific, LLC A. E. Robson, J. D. Sethian, and J. L. Giuliani Naval Research Laboratory High Average Power Laser Program Workshop Naval Research Laboratory, Building 226 Auditorium October 30 and 31, 2007.
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D. V. Rose*Voss Scientific, LLC
A. E. Robson, J. D. Sethian, and J. L. Giuliani
Naval Research Laboratory
High Average Power Laser Program Workshop
Naval Research Laboratory, Building 226 Auditorium
October 30 and 31, 2007
*With a special acknowledgement to Chris Mostrom for continuing work on 3D graphics!
Ion channel “width” as a function of time at r=29 cm in the escape cusp.
Ion channel transverse momentum (vz) at r=29 cm.
HeliumDensity at25 ms
The resulting time-integratedenergy deposition is a littlebroader than the 4-coil case.
|B| contour levels at z=0 plane illustrating magnetic void at center of trap (left). 3D representation of a single |B| iso-surface also shown (right).
The long tube-like extensions away from the center of the chamber at X-type neutral lines.
Magnetic field at x=200 cm plane:
Chamber wall, r=5 m
Sample streamlines withoutconductor boundaries:
Sample streamlines withconductor boundaries:
View from “inside” the chamber:
Particle positions and
densities at 5 ms:
Here, only surface cells with non-zerocharge deposition are plotted.
All surface cells plotted
For this case, about
40% of the ions reach theends of the drift tubes.
About 2% are deposited at the neutral line points,and 58% are in the flowerpetals radiating out from the entrance to the drift tubes.
Lsp uses combinatorialgeometry of basic objectsto build physical spaces and material boundaries.
Target planes alongone drift tube are shown.
At r = 10 m:
* Additional diagnostics, not shown here, also indicate an expanding ion beam envelope.
1-m radius solenoids at each point cusp, 2 kA/cm (11 rings each carrying x MA)
5-meter radius chamber
Conformal Triangles on 6-m radius sphere, 3 MA
3 MeV He++ ion orbits followed
Show magnetic field topology
Sample density plot
Energy deposition on surfaces.
|B|=0.6 T iso-surfaces.
Neutral lines (6)lie along thecoordinate axesin this orientation,and terminatenear the chamberwall.
Ion Energy Delivery:
~20% in 8 tube ends
~4% in 6 neutral line points
~76% in the chamber wall (flower petals)
R = 6 m
R = 10 m
* Additional diagnostics, not shown here, also indicate an oscillating ion beam envelope.
Sample orbits for 3 MeVa particles launchedfrom the origin at differentinitial angles.
Escape radius is 200 cm(the radius of the conductingspherical boundary).