在BEPC上建造γ束线站的分析

考虑电子的反冲并利用康普顿散射,研究了激光同步辐射光源(LSS)辐射的光子波长、光子能量。结果表明,对于不同的γ,LSS辐射的光子波长和能量有不同的近似公式。当γ<<λ1/4λe时,LSS辐射的光子波长λ2≈λ1/4γ2,能量(εc2≈4γ2εc1;当γ>>λ1/4λe时,LSS辐射的光子波长λ2≈λe/γ,能量cε2≈m0γc2;结果表明,LSS辐射的条件是种子激光的波长λ1大于电子的物质波波长λm;LSS辐射的极值波长是λ2m ax=h/m0γv,极值能量是cε2m ax=βeε;本文后半部分提出了利用北京正负电子对撞机的强流高亮度电子束与激光的康普顿背散射产生单色γ射线的建议。

Analysis of Building γ-Ray Source in BEPC

The wavelengths and energies of photons emitted from laser synchronal source(LSS)are investigated by using the Compton scattering. In the calculation,the recoil effect of electron is also considered. The results show that the wavelength and energy formulas correspond to different approximations for different γ ranges. In the case of γ＜＜λ1/4λe,the approximations are λ2≈λ1/4γ2 andεc2≈4γ2εc1 respectively;while in the case of γ＞＞λ1/4λe,the approximations are λ2≈ λe/γ and εc2≈moγc2 respectively. Calculated from the present work,the radiation condition of the LSS is λ1＞λm. The maximum wavelength and energy of photons emitted from the LSS are found to be λ2max=h/m0γv andεe2max=βεe respectively. The latter part of this paper proposes to produce monochromatic y rays via Compton backscattering in the collision between laser and intense current electron beam of high brightness in BEPC.