光阴极微波电子枪中激光脉冲的时间抖动测量
Measurement method of time jitter between pump laser pulse and RF wave by the charge change in photoinjector
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摘要: 研究了光阴极微波电子枪输出电荷量与驱动激光相对于微波入射相位的关系。通过对光阴极材料在光电子发射时的肖特基效应和电子束团在电子枪内的纵向加速过程分析模拟，得到了电子枪输出电荷量与激光入射相位的一段线性关系，设计了利用此关系测量驱动激光脉冲相对于微波相位的时间抖动的实验方案。结果表明，这种测量方法可以分辨1.15fs的时间抖动，误差为0.23fs。Abstract: In photocathode RF gun, the Schottky effect in process of photoemission and electron lognitudinal accelerating process bring forth a linear work range in which electron charge out of gun is linear proportion to laser injection phase . According to the result ,we develop a method that can be used to measure time jitter between laser pulse and RF wave. The method can attain to high precision and small error. On general photoinjector condition, the precision is almost 1.15fs，the error is almost 0.23fs.
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Key words:
- rf gun /
- schottky effect /
- time jitter /
- measurement
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