Takahashi Kazumasa, Kuzumoto Masayuki, Matsumoto Yuki, Sasaki Toru, Kikuchi Takashi
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan.
Rev Sci Instrum. 2020 Mar 1;91(3):033310. doi: 10.1063/1.5128633.
We investigated plasma behavior with a solenoid-generated static and pulsed magnetic field by measuring time evolution in a transverse ion current profile to control the ion current waveform of a laser ion source. The results showed that static magnetic fields cannot enhance the ion current in the slow region of time of flight (TOF). However, a pulsed magnetic field whose magnetic flux density is rising while a plasma passes through the solenoid can enhance the ion current in the same TOF region. The results showed that applying a pulsed magnetic field to a laser-produced plasma is an effective way to control an ion current waveform in a laser ion source to produce an ion beam with a flat-top-shaped pulse. By using a pulsed magnetic field, the ion current waveform peak was held for ∼50 µs.
我们通过测量横向离子电流分布随时间的演化，研究了在螺线管产生的静态和脉冲磁场中的等离子体行为，以控制激光离子源的离子电流波形。结果表明，静态磁场不能增强飞行时间（TOF）慢区的离子电流。然而，当等离子体通过螺线管时，磁通密度上升的脉冲磁场可以增强相同TOF区域的离子电流。结果表明，对激光产生的等离子体施加脉冲磁场是控制激光离子源中离子电流波形以产生平顶脉冲离子束的有效方法。通过使用脉冲磁场，离子电流波形峰值保持了约50微秒。
