Two electron lenses ($e$-lenses) have been in operation during the 2015 RHIC physics run as part of a head-on beam-beam compensation scheme. While the RHIC lattice was chosen to reduce the beam-beam-induced resonance-driving terms, the electron lenses reduced the beam-beam-induced tune spread. This has been demonstrated for the first time. The beam-beam compensation scheme allows for higher beam-beam parameters and therefore higher intensities and luminosity. In this paper, we detail the design considerations and verification of the electron beam parameters of the RHIC $e$-lenses. Longitudinal and transverse alignments with ion beams and the transverse beam transfer function measurement with head-on electron-proton beam are presented.
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机译：在2015年RHIC物理实验中，作为正面光束补偿方案的一部分，已经运行了两个电子透镜（$ e $透镜）。而被选择了RHIC晶格减小光束束诱发的共振驱动方面，电子透镜减小光束束诱导调传播。这是第一次证明。光束补偿方案允许使用更高的光束参数，因此可以提供更高的强度和亮度。在本文中，我们详细介绍了RHIC $ e $透镜的设计注意事项和电子束参数的验证。提出了离子束的纵向和横向对准以及正电子质子束的横向束传递函数测量。
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