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首页> 外文期刊>Spectrochimica Acta, Part B. Atomic Spectroscopy >Slow muon experiment by laser resonant ionization method at RIKEN-RAL muon facility
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Slow muon experiment by laser resonant ionization method at RIKEN-RAL muon facility

机译：RIKEN-RAL介子装置的激光共振电离方法进行慢介子实验

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摘要

We report first results of the slow muon generation from pulsed surface muon beam using a method of resonant laser ionization of muonium. The muonium is produced from the muon beam by electron capture near the surface of thin tungsten foil heated to 2100 K. The ionization is resonantly enhanced by using a vacuum-ultraviolet (VUV) radiation resonant with 2P state of munoum (lambda_(1S-2P)=122.09 nm). A pulsed beam at 355 nm is used for an efficient ionization from the 2P state. The VUV beam with pulse duration of 4 ns and with bandwidth of over 100 GHz to match the Doppler broadening of muonium (200 GHz) is generated by resonant third-order sum-different frequency conversion (omega_(VUV)=2omega_R-omega_T) in krypton gas phase-matched with argon buffer gas. The omega_R beam has been tuned to the two-photon resonance of 4p~5 5p[1/2,0] state in krypton to enhance the conversion process. Yield of the VUV radiation has been investigated for different energies and confocal parameters of the incident beams. The whole apparatus, including a beamline for transport and detection of ionized particles, has been tested by ionizing residual hydrogen atoms at an ultra-high vacuum level of 1.1 X 10~(-9) hPa with efficiency better than 10~(-3). The yield of slow muons obtained during the first beamtime was 0.03 mu~(+/s).
机译：我们报告了使用共振laser离子电离method的方法从脉冲表面μ子束产生缓慢μ子的结果。 heated是通过加热到2100 K的薄钨箔表面附近的电子俘获而从on子束产生的。通过使用具有state子2P状态共振的真空紫外（VUV）辐射来共振增强离子化（lambda _（（1S-2P ）= 122.09 nm）。 355 nm的脉冲束用于从2P状态有效电离。通过共振三阶和差频率转换（omega_（VUV）= 2omega_R-omega_T）产生脉冲持续时间为4 ns，带宽超过100 GHz以匹配mu的多普勒展宽（200 GHz）的VUV光束。 rypto气与氩缓冲气相匹配。 omega_R光束已被调谐到in中4p〜5 5p [1 / 2,0]状态的双光子共振，以增强转换过程。对于不同能量和入射光束的共焦参数，已经研究了VUV辐射的产量。整个装置，包括用于传输和检测电离粒子的光束线，已经通过在1.1 X 10〜（-9）hPa的超高真空水平下以高于10〜（-3）的效率对残留氢原子进行电离的方法进行了测试。 。在第一束时间中获得的慢μ子的产量为0.03μs（+ / s）。

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