Atom interferometry is an advanced optical manipulation tool of atoms in precision measurement field. Wavefront aberrations of the Raman beam have become one of the major obstacles impeding the improvement of measurement accuracy. Beforehand measurement of laser wavefront is impractical due to the further wavefront deterioration during optical mounting. In this work, we present a general method for evaluating the effective Raman wavefront that atoms experience and the corresponding phase shift of interferometric fringes. The method extracts the effective Zernike polynomial terms and reconstructs the wavefront using optimal estimation theory. The evaluation accuracy and convergence speed are discussed by simulation. The results predict the method adaptability and provide strong support on analytical and numerical reference for wavefront error compensation.
The radiation detectors based on the third era semiconductor material silicon carbide (SiC) with wide energy band gap are the most promising ionizing radiation detectors in high temperature and harsh radiation environment. This paper illustrated several important advantages of the SiC neutron detector and described its fabrication and detection principle briefly. Furthermore, we evaluated the neutron sensor’s measurement performance when detecting the 2.5MeV and 14MeV neutrons under different conditions of sensor’s active layer thickness and polyethylene converter film thickness based on MCNP simulation. According to the results of simulation, the sensor’s optimal configuration was designed. For the sensor whose radius and depletion layer thickness are 3mm and 30μm respectively, the detection efficiency can reach 3.16×10-18 coulomb per neutron (c/n) and 1.80×10-17 c/n for 2.5MeV and 14MeV neutrons respectively. When adding a polyethylene converter film of 90μm thickness to the above sensor, the detection efficiency to 2.5MeV neutron will be 3.7 times that without neutron converter film; and with the converter film of 2mm thickness, the detection efficiency to 14MeV neutron will be improved by 246%.
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