Electron lenses for head-on beam-beam compensation in RHIC
oleh: X. Gu, W. Fischer, Z. Altinbas, M. Anerella, E. Bajon, M. Bannon, D. Bruno, M. Costanzo, A. Drees, D. M. Gassner, R. C. Gupta, J. Hock, M. Harvey, A. K. Jain, J. P. Jamilkowski, P. Kankiya, R. Lambiase, C. Liu, Y. Luo, M. Mapes, A. Marusic, C. Mi, R. Michnoff, T. A. Miller, M. Minty, S. Nemesure, W. Ng, D. Phillips, A. I. Pikin, P. J. Rosas, G. Robert-Demolaize, T. Samms, J. Sandberg, V. Schoefer, T. C. Shrey, Y. Tan, R. Than, C. Theisen, P. Thieberger, J. Tuozzolo, P. Wanderer, W. Zhang, S. M. White
| Format: | Article |
|---|---|
| Diterbitkan: | American Physical Society 2017-02-01 |
Deskripsi
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.