Intense γ-ray generation for a polarized positron beam in a linear collider

[摘要]

$\gamma$-ray generation by Compton backscattering in an optical lens series with periodic focal points is considered to produce a polarized positron beam for a linear collider. The lens series is composed of 20 unit cells with a length of 210 mm. Each lens has a hole to pass an electron beam with an energy of 5.8 GeV and the generated $\gamma$ rays. It is shown by diffraction analysis that laser beam loss in the series is very small, and the beam size is periodically reduced to $26\mu \mathrm{m}$. Electron beam size is reduced to $34\mu \mathrm{m}$ in a superconducting solenoid with a field of 15 T. To get a required $\gamma$-ray yield of $7\times {10}^{15}\gamma /\mathrm{s}$, only one circularly polarized ${\mathrm{CO}}_2$ laser source with a power of 24 kW is needed.

[发布日期] 2001-12-28