Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter.
Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter.
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DOI：
10.1038/ncomms15693
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发表时间：
2017-06-01
影响因子：
16.6
通讯作者：
Roth M
中科院分区：
文献类型：
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作者：
Cayzac W;Frank A;Ortner A;Bagnoud V;Basko MM;Bedacht S;Bläser C;Blažević A;Busold S;Deppert O;Ding J;Ehret M;Fiala P;Frydrych S;Gericke DO;Hallo L;Helfrich J;Jahn D;Kjartansson E;Knetsch A;Kraus D;Malka G;Neumann NW;Pépitone K;Pepler D;Sander S;Schaumann G;Schlegel T;Schroeter N;Schumacher D;Seibert M;Tauschwitz A;Vorberger J;Wagner F;Weih S;Zobus Y;Roth M
离子在稠密等离子体中的能量沉积是惯性约束聚变中的一个关键过程，它决定了α粒子的加热，从而在氢芯块中引发燃烧波，产生高热核增益。然而，离子停止在等离子体中的测量是稀缺的，主要限于高离子速度的理论与数据一致。在这里，我们报告的实验数据在布拉格峰附近的低弹丸速度，在那里的阻止力达到最大值。该参数范围具有最大的理论不确定性，直到今天仍缺少结论性数据。我们的测量精度，结合等离子体参数的可靠知识，允许证伪几个标准模型的阻止功率通常遇到的惯性聚变中的光束速度。另一方面，我们的数据支持的理论，包括一个详细的处理强离子-电子碰撞。离子在等离子体中的能量损失是惯性约束聚变研究中的一个难题，关于离子阻止本领的理论模型很多。在这里，作者使用激光产生的等离子体探测的加速器产生的离子在实验中区分布拉格峰附近的各种离子停止模型。
The energy deposition of ions in dense plasmas is a key process in inertial confinement fusion that determines the α-particle heating expected to trigger a burn wave in the hydrogen pellet and resulting in high thermonuclear gain. However, measurements of ion stopping in plasmas are scarce and mostly restricted to high ion velocities where theory agrees with the data. Here, we report experimental data at low projectile velocities near the Bragg peak, where the stopping force reaches its maximum. This parameter range features the largest theoretical uncertainties and conclusive data are missing until today. The precision of our measurements, combined with a reliable knowledge of the plasma parameters, allows to disprove several standard models for the stopping power for beam velocities typically encountered in inertial fusion. On the other hand, our data support theories that include a detailed treatment of strong ion-electron collisions. The energy loss of ions in plasma is a challenging issue in inertial confinement fusion and many theoretical models exist on ion-stopping power. Here, the authors use laser-generated plasma probed by accelerator-produced ions in experiments to discriminate various ion stopping models near the Bragg peak.