Neutron yield scaling law in laser-cluster fusion experiments

Nuclear Fushion

article

Junho Won¹  Jaehyun Song¹  Seongmin Lee¹  Chiwan Song¹  Woosuk Bang¹ 

[1] Department of Physics and Photon Science;Center for Relativistic Laser Science, Institute for Basic Science

关键词: laser fusion;    laser-cluster fusion;    nuclear fusion;    fusion yield;   

DOI  :  10.1088/1741-4326/accdea

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

We present a scaling law (Ysim {E^beta } ) of fusion neutron yields ( Y ) for laser pulse energy ( E ) in laser-cluster fusion experiments. We compare the available neutron yield data from previous deuterium cluster fusion experiments with those calculated using the cylindrical fusion plasma model. The calculated neutron yields are shown as functions of the incident laser pulse energy, average number density, and ion temperature. Although the deuterium–deuterium fusion reactivity is known to increase rapidly with ion temperature, the neutron yield shows a modest increase above ∼10 keV for a given laser pulse energy. We find the scaling exponentβapproaching 1.0 as the ion temperature increases from 1 keV to 100 keV. We explain the observed temperature dependence ofβby examining the temperature dependence of the beam–beam and beam–target fusion neutron yields separately. Our scaling law differs from previously reported scaling laws from individual experiments, but it shows an excellent agreement with the scaling law determined by the maximum neutron yields of individual experiments.

【 授权许可】

Unknown