Okamura M, Adeyemi A, Kanesue T, Tamura J, Kondo K, Dabrowski R
Brookhaven National Laboratory, Upton, New York 11973, USA.
Rev Sci Instrum. 2010 Feb;81(2):02A510. doi: 10.1063/1.3267312.
A laser ion source (LIS) can easily provide a high current beam. However, it has been difficult to obtain a longer beam pulse while keeping a high current. On occasion, longer beam pulses are required by certain applications. For example, more than 10 micros of beam pulse is required for injecting highly charged beams to a large sized synchrotron. To extend beam pulse width, a solenoid field was applied at the drift space of the LIS at Brookhaven National Laboratory. The solenoid field suppressed the diverging angle of the expanding plasma and the beam pulse was widened. Also, it was observed that the plasma state was conserved after passing through a few hundred gauss of the 480 mm length solenoid field.
激光离子源（LIS）能够轻松提供高电流束流。然而，在保持高电流的同时获得更长的束流脉冲一直存在困难。某些应用有时需要更长的束流脉冲。例如，将高电荷束流注入大型同步加速器需要超过10微秒的束流脉冲。为了延长束流脉冲宽度，在布鲁克海文国家实验室的激光离子源漂移空间施加了一个螺线管场。该螺线管场抑制了膨胀等离子体的发散角，束流脉冲得以加宽。此外，还观察到等离子体状态在经过长度为480毫米、几百高斯的螺线管场后得以保持。
