Yoshida K, Nara T, Saitoh Y, Yokota W
Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan.
Rev Sci Instrum. 2010 Feb;81(2):02A312. doi: 10.1063/1.3277193.
Beam intensity fluctuation was investigated using an electron cyclotron resonance ion source of an all-permanent-magnet type under development for highly stable beam intensity. While the source achieved a stability of better than 3.2% by strict regulation of the coolant temperature change within +/-0.1 degrees C, the intensity varies strongly with intentional changes in the temperature of the plasma chamber coolant. The influence of the temperature on chamber expansion, magnetic field strength, and vacuum was measured or estimated in detail. The result shows that a slight change in vacuum and magnetic field strength has considerable influence on the intensity fluctuation.
为了实现高稳定束流强度，使用一台正在研发的全永磁型电子回旋共振离子源对束流强度波动进行了研究。虽然通过将冷却剂温度变化严格控制在±0.1摄氏度以内，该离子源实现了优于3.2%的稳定性，但束流强度会随着等离子体腔冷却剂温度的有意变化而强烈变化。详细测量或估算了温度对腔室膨胀、磁场强度和真空度的影响。结果表明，真空度和磁场强度的微小变化对强度波动有相当大的影响。
