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本文描述了一种六极型铯束实验装置的结构和性能。它采用漂移区长27.4cm的同轴谐振腔,束光学用“点源”与“点靶”的对称配置,得到的Ramsey线宽为190Hz,相应信号原子的平均速度约104m/s。它应用高阻放大器代替电子倍增器,成功地解决了我国铯束装置长寿命工作的一个关键问题。初步测试结果表明,装置的频率稳定度为σ_y(τ)≈1.9×10~(-11)/τ~(1/2),τ=1h时为3.2×10~(-13),今后不难提高到(1～2)×10~(-13)/h。
This article describes the structure and performance of a six-pole cesium beam experimental setup. It uses a coaxial resonator with a drift length of 27.4 cm and a symmetrical configuration of “point source” and “spot target” for beam optics, resulting in a Ramsey linewidth of 190 Hz and an average signal-atom velocity of about 104 m / s. It uses a high-impedance amplifier instead of an electron multiplier and successfully solves a key issue of the long-life work of the cesium beam device in our country. The preliminary test results show that the frequency stability of the device is σ_y (τ) ≈1.9 × 10 ~ (-11) / τ ~ (1/2) and 3.2 × 10 ~ (-13) when τ = 1h. Increased to (1 ~ 2) × 10 ~ (-13) / h.