Cnostruction of an aparatus for Production and Detection of Axions by Using Optical Cavities

光腔轴子产生与检测装置的研制

• 批准号: 07554076
• 负责人: FUKUDA Yukio
• 金额: $ 1.15万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554076/
• 关键词: AXION; STANDARD THEORY; OPTICAL RESONATOR; LASER; PERMANENT MAGNET; SINGLE PHOTON COUNTING; HIGH-REFLECTIVITY MIRROR; 波長制御

The axion is a pseudoscalar Goldstone boson required by the standard model of elementary particle or QCD (the quantum chromo-dynamics) in connection with the strong CP-problem, and is also important as a leading candidate of the dark matter predicted by the current cosmology. However it has not been detected so far in spite of a lot of efforts.We constructed an experimental apparatus to produce and detect axions, in which firstly laser photons are converted into axions in a strong magnetic field via the Primakoff effect, secondly vice versa in another magnetic field and reproduced photons are counted. We introduced a new experimental scheme which employs two optical resonators composed of high-reflectivity mirrors, one for the first and the other for the second conversion processes, to multiply the conversion efficiencies by F_1F_2 (Fi : the finesse of the i-th resonator). The signal photons expected are proportional to (gBL)^4F_1F_2 with the coupling constant g, and the magnetic field … More Bi(=B) and the length Li(=L).Coherent photons from a laser enter the first optical resonator, where a strong magnetic field is applied parallel to the electric field of the photons and some of the photons are converted into axions. Because of extremely weak interaction between axions and materials, the axions go through an opaque wall freely and go into the second optical resonator, while the photons are completely blocked by the wall. The axion field is a coherent wave with substantially the same wavelength as the photon field. Some of the axions are converted into signal photons via the inverse process in the second resonator. Both of the resonators are tuned to the the same wavelength. The signal photons are detected by a single photon counter behind the second resonator.An preliminary experiment was performed without the second resonator. Under the conditions F=3 x 10^3, L=0.97m, B=1.0 T(permanent magnets) and Pin=50 mW,an observation for 3.0 x10^3 s gave no signals. From this result, considering the quantum efficiency of 0.1, the dark count rate of 0.3 s^<-1> of the photomultiplier, and other experimental parameters, an upper limit of the coupling constant was obtained as g<1.1x10^<-5> GeV^<-1>. Less

轴子是基本粒子标准模型或QCD(量子色动力学)所要求的与强CP问题有关的伪标量Goldstone玻色子，也是当前宇宙学预测的暗物质的主要候选者。我们搭建了一套轴子产生和探测的实验装置，首先在强磁场中通过Primakoff效应将激光光子转化为轴子，然后在另一个磁场中将激光光子转化为轴子，并对再生光子进行计数。我们介绍了一种新的实验方案，该方案采用两个高反射率镜组成的光学谐振腔，一个用于第一次转换过程，另一个用于第二次转换过程，将转换效率乘以F_1F_2(Fi：第i阶谐振腔的精细度)。信号光子数与(Gbl)^4F1F2成正比，耦合常数为g，磁场为…更多的Bi(=B)和长度Li(=L)。来自激光的相干光子进入第一光学谐振腔，在那里施加一个平行于光子电场的强磁场，一些光子被转换成轴子。由于轴子与材料之间的相互作用极弱，轴子自由穿过不透明的壁进入第二光学谐振腔，而光子则完全被壁所阻挡。轴子场是与光子场波长基本相同的相干波。一些轴子通过第二谐振腔中的相反过程转换为信号光子。两个谐振器都调谐到相同的波长。信号光子由第二谐振腔后面的单光子计数器探测，在没有第二谐振腔的情况下进行了初步实验。在F=3×10^3，L=0.97m，B=1.0T(永磁体)，Pin=50 mW的条件下，对3.0×10^3 S的观测没有信号。根据这一结果，考虑到光电倍增管的量子效率为0.1，暗计数率为0.3GeV^-1&gt；等实验参数，得到耦合常数的上限为g&lt；1.1×10；-5；Gev^-1&gt；。较少

项目成果

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