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Exploring vacuum birefringence based on a 100 PW laser and an x-ray free electron laser beam

机译：基于100 PW激光和X射线自由电子激光束探测真空双折射

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摘要

Exploring vacuum birefringence with the station of extreme light at Shanghai Coherent Light Facility is considered. Laser pulses of intensity beyond 10(23)Wcm(-2) are capable of polarizing the vacuum due to the ultra-strong electro-magnetic fields. The subtle difference of the vacuum refractive indexes along electric and magnetic fields leads to a birefringence effect for lights propagating through. The vacuum birefringence effect can now be captured by colliding a hard x-ray free electron laser (XFEL) beam with a high-power laser. The initial XFEL beam of pure linear polarization is predicated to gain a very small ellipticity after passing through the laser stimulated vacuum. Various interaction geometries are considered, showing that the estimated ellipticity lies between 1.8 x 10(-10) and 10(-9) for a 100 PW laser interacting with a 12.9 keV XFEL beam, approaching the threshold for todays' polarity detection technique. The detailed experimental set-up is designed, including the polarimeter, the focusing compound refractive lens and the optical path. When taking into account the efficiencies of the x-ray instruments, it is found that about 10 polarization-flipped x-ray photons can be detected for a single shot for our design. Considering the background noise level, accumulating runs are necessary to obtain high confident measurement.
机译：本文考虑在上海相干光设备上用极限光站探测真空双折射。强度超过10（23）Wcm（-2）的激光脉冲能够在超强电磁场的作用下使真空偏振。真空折射率沿电场和磁场方向的细微差异导致光在其中传播时产生双折射效应。现在，高功率x射线激光可以捕捉到无双折射的电子束。根据预测，纯线性偏振的初始XFEL光束通过激光激励真空后将获得非常小的椭圆度。考虑了各种相互作用几何结构，结果表明，对于与12.9 keV XFEL光束相互作用的100 PW激光，估计的椭圆度介于1.8 x 10（-10）和10（-9）之间，接近当今极性检测技术的阈值。设计了详细的实验装置，包括偏振仪、聚焦复合折射透镜和光路。当考虑到x射线仪器的效率时，我们发现，在我们的设计中，单次激发可以检测到大约10个偏振翻转的x射线光子。考虑到背景噪声水平，累积运行是获得高置信度测量的必要条件。

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  • 作者

    Shen Baifei; Bu Zhigang; Xu Jiancai; Xu Tongjun; Ji Liangliang; Li Ruxin; Xu Zhizhan;

  • 作者单位

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Opt &

    Fine Mech State Key Lab High Field Laser Phys Shanghai 201800 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    vacuum birefringence; 100 PW; XFEL; SEL; SCLF;

    机译：真空双折射;100 pw;xfel;sel;sclf;

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