Evaluating a Contribution of the Knock-on Deuterons to the Neutron Yield in the Experiments with Weakly Collisional Plasma Jets (Part 2)

Ryutov, D. D.¹ 

[1] Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

关键词: NEUTRONS;    DEUTERONS;    COLLISIONLESS PLASMA;    YIELDS;    CARBON 12 TARGET;    DEUTERON REACTIONS;    CROSS SECTIONS;    KNOCK-ON;    BACKSCATTERING;    PLASMA DENSITY;    DEUTERIUM TARGET;   

DOI  :  10.2172/1235390
RP-ID  :  LLNL--TR-680076
PID  :  OSTI ID: 1235390
Others  :  TRN: US1600244

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Part 1 of this note considered the kinematics of large-angle scattering (LAS) of the deuterons on the counter-streaming carbon ions, with both flows having the same velocity V. Due to a large mass ratio m_C/m_D, the backscattered deuterons have high velocity of up to (24/7)V. This significantly increases the cross-section for the neutron production in the collisions between the back-scattered and incoming deuterons and may provide significant contribution to the total neutron yield, despite the smallness of a large-angle Coulomb cross-section. This effect becomes particularly important when only one of the colliding streams is made of CD, whereas the other stream is made of CH. Part 1 evaluated the neutron yield produced by this mechanism and have found that its relative role increases for higher plasma densities and lower velocities. Part 2 discusses signatures of this effect which can be used to identify it experimentally and also discusses in some more detail its spatio-temporal characteristics. It goes without saying that a complete quantitative assessment should be based on numerical simulations accounting for the large-angle scattering.