摘要
采用单缝单针法测量电子枪束流的发射度。用可移动的宽0.1mm单缝取样,与缝平行的直径为0.1mm匀速运动的探针接收穿过狭缝的束流。 缝、针距离为59mm,角分辨率为3.4mrad,系统最大接收度为0.64cm·rad。缝、针间设有平行度调节装置,提高了测量精度;狭缝板设有水冷结构,可承受较大的束流功率,采用良好的屏蔽及合理的二次电子抑制结构,清晰地测出了10^(-10)A量级的弱信号电流。所测相图的相对误差约为8％。利用该装置方便地测得了电子枪高压、栅控脉冲电压、阴极温度、脉冲流强等不同条件下的发射度变化。
Single slit and probe method has been used for measuring the beam emittance of an electron gun . Amovable slit 0.1mm wide is used for sampling .A probe 0.1mmin diameter parallel to the slit and moving at a constant velocity , is used to catch the beam through the slit . Using geometrical relation , the divergence r1 'and r2 'of the beam through the slit can be calculated .
In our device, the distance between the slit and the probe is 59mm, the angle resolution is 3.4mrad, and the maximum system acceptance is 6.4× 10-1cm ?rad. A mechanism is designed to adjust the depth of parallelism between the slit and probe in order to improve the measurement accuracy. There is water cooled structure in the slit plate, which can bear higher beam power. With fine shielding and rational second - electron suppressor, the current of the order of 10-10 A has been clearly measured. The relative error of the measured phase plots is about 8%. The system is useful to study the effects on the emittance, of electron energy , the grid pulse voltage, cathode temperature, pulse current intensity.
出处
《强激光与粒子束》
EI
CAS
CSCD
1992年第2期215-222,共8页
High Power Laser and Particle Beams
关键词
发射度测量
电子枪
束流
emittance measurement, single slit and probe, probe-slit emittance measurement device.
