Rygg J R, Séguin F H, Li C K, Frenje J A, Manuel M J-E, Petrasso R D, Betti R, Delettrez J A, Gotchev O V, Knauer J P, Meyerhofer D D, Marshall F J, Stoeckl C, Theobald W
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science. 2008 Feb 29;319(5867):1223-5. doi: 10.1126/science.1152640.
A distinctive way of quantitatively imaging inertial fusion implosions has resulted in the characterization of two different types of electromagnetic configurations and in the measurement of the temporal evolution of capsule size and areal density. Radiography with a pulsed, monoenergetic, isotropic proton source reveals field structures through deflection of proton trajectories, and areal densities are quantified through the energy lost by protons while traversing the plasma. The two field structures consist of (i) many radial filaments with complex striations and bifurcations, permeating the entire field of view, of magnetic field magnitude 60 tesla and (ii) a coherent, centrally directed electric field of order 10(9) volts per meter, seen in proximity to the capsule surface. Although the mechanism for generating these fields is unclear, their effect on implosion dynamics is potentially consequential.
一种用于惯性聚变内爆定量成像的独特方法，已实现了对两种不同类型电磁构型的表征，并测量了靶丸尺寸和面积密度的时间演化。使用脉冲、单能、各向同性质子源进行射线照相，通过质子轨迹的偏转揭示场结构，面积密度则通过质子穿过等离子体时损失的能量来量化。这两种场结构包括：（i）许多具有复杂条纹和分支的径向细丝，贯穿整个视野，磁场强度为60特斯拉；（ii）在靶丸表面附近可见的、强度约为每米10⁹伏的相干、指向中心的电场。尽管产生这些场的机制尚不清楚，但它们对内爆动力学的影响可能至关重要。
