GEANT4 implementation of the polarized 3He target for the JLab GEn Experiment
Some notes about the Helmholtz coils follow below, since there are two options, cylindrical or toroidal geometries.
Choose the core material to be aluminum. Assume copper wiring is a small effect
Dimensions of coil geometry, implemented as cylinders (G4Tubs). G10 wall is actually a G4Tubs with a hollow core, and a wall thickness as specified below. The major and minor G10 thicknesses are estimates
| Label | rmin (cm) | rmax (cm) | length (cm) | G10 Wall (cm) |
|---|---|---|---|---|
| major | 72.23 | 79.38 | 8.09 | 5.0 |
| minor | 63.18 | 67.79 | 6.48 | 5.0 |
| rfy | 48.89 | 52.07 | 1.41 | 0.076 |
Dimensions of coil geometry, implemented as toruses (G4Torus). G10 wall is actually a G4Torus with a hollow core, and a wall thickness as specified below.
| Label | rtor (cm) | rmin (cm) | rmax (cm) | length (cm) | G10 Wall (cm) |
|---|---|---|---|---|---|
| major | 75.81 | 0.0 | 7.15 | 8.09 | 5.0 |
| minor | 65.48 | 0.0 | 4.61 | 6.48 | 5.0 |
| rfy | 50.48 | 0.0 | 3.18 | 1.41 | 0.076 |