Preliminary study on temperature distribution and pyroelectric current of LiNbO3 heated by nanosecond pulse laser

In order to reduce the volume of compact neutron generators,a lot of investigations are carried out on generating high voltagesby heating pyroelectric crystals with external heating. Laserirradiation is an effective non-contact heating method. Differentlaser parameters determine the crystal's t...

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Bibliographic Details
Published in:Journal of instrumentation 2024-10, Vol.19 (10), p.P10034
Main Authors: Cao, Xiang, Dai, Chuqiao, Guo, Zhengpeng, Zhang, Tianhao, Jiang, Xianlong, Ma, Wei, Zou, Liping, Lu, Liang, Yang, Zhen
Format: Article
Language:English
Subjects:
Crystals
Electric contacts
Electric fields
Instrumentation for neutron sources
Laser beam heating
Lithium niobates
Nanosecond pulses
Neutron sources
Parameters
Simulation methods and programs
Simulation models
Temperature distribution
Thermal simulation
Transient heat transfer
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Summary:In order to reduce the volume of compact neutron generators,a lot of investigations are carried out on generating high voltagesby heating pyroelectric crystals with external heating. Laserirradiation is an effective non-contact heating method. Differentlaser parameters determine the crystal's temperature distribution,impacting the accelerating electric field. A preliminary study onthe temperature distribution and pyroelectric current response ofLiNbO3 heated by nanosecond pulse laser is presented, includingboth direct heating and heating with Cu and Ti disks adhered to thecrystal. A two-dimensional transient heat transfer and circuit modelis constructed in COMSOL. To validate the simulation model oftemperature field distribution, FLIR thermal camera is utilized tomeasure the temperature in laser spot center experimentally. Theexperimental results coincide with simulations, which prove that thesimulation model can predict temperature field distribution of thepyroelectric crystal effectively. This study can benefit theoptimization of laser parameters for modulating high-qualitydeuterium ion acceleration fields.
ISSN:1748-0221
DOI:10.1088/1748-0221/19/10/P10034