摘要
ABSTRACT Aneutronic fusion reactions such as proton-boron fusion could efficiently produce clean energy with quite low neutron doses.However,as a consequence,conventional neutron spectral methods for diagnosing plasma ion temperature would no longer work.Therefore,finding a way to probe the ion temperature in aneutronic fusion plasmas is a crucial task.Here,we present a method to realize ultrafast in situ probing of^(11)B ion temperature for proton-boron fusion by Doppler broadening of the nuclear resonance fluorescence(NRF)emission spectrum.The NRF emission is excited by a collimated,intenseγ-ray beam generated from submicrometer wires irradiated by a recently available petawatt(PW)laser pulse,where theγ-ray beam generation is calculated by three-dimensional particle-in-cell simulation.When the laser power is higher than 1 PW,five NRF signatures of a^(11)B plasma can be clearly identified with high-resolutionγ-ray detectors,as shown by our Geant4 simulations.The correlation between the NRF peak width and^(11)B ion temperature is discussed,and it is found that NRF emission spectroscopy should be sensitive to 11B ion temperatures T_(i)>2.4 keV.This probing method can also be extended to other neutron-free-fusion isotopes,such as^(6)Li and^(15)N.
基金
the National Natural Science Foundation of China(Grant Nos.11675075 and 11775302)
the Youth Talent Project of Hunan Province,China(Grant No.2018RS3096)
the Independent Research Project of the Key Laboratory of Plasma Physics,CAEP(Grant No.JCKYS2021212009)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA25050300)
the National Key R&D Program of China(Grant No.2018YFA0404801)
the Research Project of NUDT(Grant No.ZK18-02-02)
the Fundamental Research Funds for the Central Universities,the Research Funds of Renmin University of China(Grant No.20XNLG01).
