Table 2 Hot electron yield \({Y}_{{e}^{-}}\), positron yield \({Y}_{{e}^{+}}\), the laser energy conversion efficiency \({\eta }_{{\rm{laser}}\to {e}^{+}}\) and angle with respect to the laser axis containing 50% positrons emitted from the high Z target when \({a}_{0}=20\).
\({\bf{d}}({\boldsymbol{\mu }}{\bf{m}})\) | 0.5 | 2.0 | 3.7 | 4.5 | 5 |
|---|---|---|---|---|---|
\({Y}_{{e}^{-}}\) (>5 MeV) | \(5.2\times {10}^{10}\) | \(2.3\times {10}^{11}\) | \(2.3\times {10}^{11}\) | \(1.9\times {10}^{11}\) | \(1.8\times {10}^{11}\) |
\({Y}_{{e}^{+}}\) | \(3.2\times {10}^{7}\) | \(2.9\times {10}^{9}\) | \(7.2\times {10}^{9}\) | \(7.6\times {10}^{9}\) | \(6.1\times {10}^{9}\) |
\({\eta }_{{\rm{laser}}\to {e}^{+}}\) | \(7.5\times {10}^{-6}\) | 0.03% | 0.13% | 0.18% | 0.14% |
\({\theta }_{{e}^{+}}\) (>50%) | 27.7° | 23.85° | 25.20° | 24.93° | 25.38° |
