Ultra-fast neutron pulse energy spectrum detection system and method

Abstract

The invention relates to an ultrafast neutron pulse energy spectrum detection system and method, and aims to solve the problem that an existing neutron energy spectrometer cannot meet the energy spectrum detection of ultrafast neutron pulse picosecond-level time resolution. The system comprises a synchronous trigger unit, a linearly polarized light generation unit, a delay module, a beam splitter, a reference light unit, a detection light unit and a spectrograph. The synchronous trigger unit synchronously triggers the neutron pulse source and the linearly polarized light generation unit; the linearly polarized light generation unit generates linearly polarized light L, and the linearly polarized light L is divided into first reference light L1 and first detection light L2 after sequentially passing through the delay module and the beam splitter; the first reference light L1 is subjected to phase delay pi through the reference light unit to form second reference light L1'; and the detection light unit comprises an optical fiber circulator, a Pockels crystal and a reflector, the Pockels crystal and the reflector are arranged in the DIM cavity, the first detection light L2 enters the Pockels crystal to form second detection light L2'with a changed polarization state, the second detection light L2' and the second reference light L1' interfere with each other, and the spectrometer receives an interference image.

Description

technical field [0001] The invention relates to the field of neutron pulse ultrafast diagnosis, in particular to an ultrafast neutron pulse energy spectrum detection system and method. Background technique [0002] In the research in the field of laser inertial confinement fusion (ICF), the target pellet is compressed to a high-temperature and high-density state for fusion, which will release a large number of X-rays, high-energy electrons, and high-energy neutrons. In order to accurately grasp the physical process of fusion, high-precision diagnosis of neutron energy spectrum, generation time and other information is required. Currently, a variety of neutron diagnostic techniques are implemented at ICF facilities around the world, and the yield of laser fusion is high enough to provide spatial, temporal, and spectral information from neutron measurements that is critical to understanding the causes of ICF implosions. Performance is integral. [0003] The neutron spectrome...

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Problems solved by technology

[0004] In order to solve the problem that the existing neutron energy spectrometer cannot meet the energy spectrum detection problem of ultrafast neutron pulse picosecond time resolution, the present invention now provides an ultrafast neutron pulse energy spectrum detection system and method

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