The high-average current electron gun low energy electrons from a thermionic cathode at high intensity is the prototype of the drive beam source for the Compact Linear Collider project. The electromagnetic design of the gun was done originally with 2D simulations to minimize the beam emittance for high-current operation (of the order of 8 A) at 140 keV. This paper reports on the first experimental measurements of beam extraction and transport. For the first time, 3D tracking simulations, which take into account precisely the cathode-grid geometry, have been compared with experimental optical transition radiation images of the beam, and we obtained impressive agreement. In addition, we have confirmed that the details of the cathode-grid assembly can impact significantly the beam emittance.

中文翻译：

---

用于紧凑型线性对撞机的高电流驱动束电子枪原型的操作

来自高强度热离子阴极的高平均电流电子枪低能电子是紧凑型线性对撞机项目的驱动束源的原型。枪的电磁设计最初是通过 2D 模拟完成的，以最大限度地减少 140 keV 下高电流操作（8 A 量级）的射束发射。本文报告了光束提取和传输的首次实验测量。首次将精确考虑阴极网格几何形状的 3D 跟踪模拟与光束的实验光学跃迁辐射图像进行了比较，我们获得了令人印象深刻的一致性。此外，我们已经确认阴极-栅极组件的细节会显着影响光束发射率。