论文标题
实验室观察离子加速度通过反射掉激光产生的磁性碰撞冲击
Laboratory observation of ion acceleration via reflection off laser-produced magnetized collisionless shocks
论文作者
论文摘要
Fermi acceleration by collisionless shocks is believed to be the primary mechanism to produce high energy charged particles in the Universe,where charged particles gain energy successively from multiple reflections off the shock front.Here,we present the first direct experimental evidence of ion energization from reflection off a supercritical quasi perpendicular collisionless shock,an essential component of Fermi acceleration in a laser produced magnetized plasma.我们使用飞行方法观察到了一个准单晶离子束，上游流动的冲击速度的2,4倍。我们相关的动力学模拟再现了能量增益，并表明这些离子首先反射，然后主要由与冲击相关的运动场加速。这种机制还可以解释在地球弓休克中观察到的准单效快速离子成分。
Fermi acceleration by collisionless shocks is believed to be the primary mechanism to produce high energy charged particles in the Universe,where charged particles gain energy successively from multiple reflections off the shock front.Here,we present the first direct experimental evidence of ion energization from reflection off a supercritical quasi perpendicular collisionless shock,an essential component of Fermi acceleration in a laser produced magnetized plasma. We observed a quasi monoenergetic ion beam with 2,4 times the shock velocity in the upstream flow using time of flight method. Our related kinetic simulations reproduced the energy gain and showed that these ions were first reflected and then accelerated mainly by the motional electric field associated with the shock. This mechanism can also explain the quasi monoenergetic fast ion component observed in the Earth's bow shock.
