Abstract
A head-on beam-beam compensation scheme was implemented for operation in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory [Phys. Rev. Lett. 115, 264801 (2015)]. The compensation consists of electron lenses for the reduction of the beam-beam induced tune spread, and a lattice for the minimization of beam-beam generated resonance driving terms. We describe the implementations of the lattice and electron lenses, and report on measurements of lattice properties and the effect of the electron lenses on the hadron beam.
Highlights
In Ref. [1] the implementation of operational head-on beam-beam compensation in the Relativistic Heavy Ion Collider (RHIC) is summarized
The implemented compensation scheme consists of electron lenses for the reduction of the beam-beam induced tune spread, and a lattice for the minimization of resonance driving terms
We present in more detail the design and verification of the lattice, and measurements of the effects of the electron lenses on the proton and other ion beams
Summary
In Ref. [1] the implementation of operational head-on beam-beam compensation in the Relativistic Heavy Ion Collider (RHIC) is summarized. The implemented compensation scheme consists of electron lenses for the reduction of the beam-beam induced tune spread, and a lattice for the minimization of resonance driving terms. In. RHIC head-on beam-beam compensation is implemented in a single turn (Fig. 1) for one of the two head-on beambeam interactions, and we repeat the compensation principle presented in Refs. Condition (i) is implemented through lattice design with a phase advance of kπ between the beam-beam interaction at IP8 and the electron lenses near IP10 in both rings (Sec. III). Quantity unit 2015 value design value distance of center from IP10 m magnetic length Le m gun solenoid field Bg. T main solenoid field Bm cathode radius (2.7σ) mm rms beam size in main μm solenoid σe kinetic energy Ee keV relativistic factor βe electron beam current Ie mA beam-beam parameter
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