Head-on beam-beam compensation in RHIC

Fischer, W.; Heimerle, M.; Luo, Y.; Pikin, A.; Beebe, E.; Bruno, D.; Gassner, D.; Gu, X.; Gupta, R.; Hock, J.; Jain, A.; Lambiase, R.; Mapes, M.; Meng, W.; Montag, C.; Oerter, B.; Okamura, M.; Raparia, D.; Tan, Y.; Than, Roberto; Tuozzolo, J.; Zhang, w.

doi:10.2172/1174088

Cited by 5 publications

(4 citation statements)

References 19 publications

(25 reference statements)

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“…betatron resonances which cause emittance growth and diffuse particles into the tail of beam distribution and beyond. Consequently RHIC is actively developing an electron lens for compensating the head-on interactions [40]. In order to seek the electron lens parameters at which the beam life time is improved, we choose three different electron beam distribution functions: (a) 1σ Gaussian distribution with the same rms beam size as that of the proton beam σ, (b) 2σ Gaussian distribution with rms size twice that of the proton beam, and (c) Smooth-edge-flat-top (SEFT) distribution with an edge around at 4 σ.…”

Section: Relativistic Heavy Ion Collidermentioning

confidence: 99%

Beam–beam simulation code BBSIM for particle accelerators

Kim

Sen

2011

Nuclear Instruments and Methods in Physics Research Section A:

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A highly efficient, fully parallelized, six-dimensional tracking model for simulating interactions of colliding hadron beams in high energy ring colliders and simulating schemes for mitigating their effects is described. The model uses the weak-strong approximation for calculating the head-on interactions when the test beam has lower intensity than the other beam, a look-up table for the efficient calculation of long-range beam-beam forces, and a self-consistent Poisson solver when both beams have comparable intensities. A performance test of the model in a parallel environment is presented. The code is used to calculate beam emittance and beam loss in the Tevatron at Fermilab and compared with measurements. We also present results from the studies of two schemes proposed to compensate the beam-beam interactions: a) the compensation of long-range interactions in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven and the Large Hadron Collider (LHC) at CERN with a current-carrying wire, b) the use of a low-energy electron beam to compensate the head-on interactions in RHIC.

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Section: Relativistic Heavy Ion Collidermentioning

confidence: 99%

Beam–beam simulation code BBSIM for particle accelerators

Kim

Sen

2011

Nuclear Instruments and Methods in Physics Research Section A:

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“…The details about the status and construction of the electron lens can be found in Ref. [6]. These simulations however did not cover the coherent beam-beam effects related to the electron lens.…”

Section: Introductionmentioning

confidence: 99%

Coherent beam-beam experiments and implications for head-on compensation

White,

Blaskiewicz,

Fischer

et al. 2014

Preprint

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In polarized proton operation in the Relativistic Heavy Ion Collider (RHIC) coherent beam-beam modes are routinely observed with beam transfer function measurements. These modes can become unstable under external excitation or in the presence of impedance. This becomes even more relevant in the presence of head-on compensation, which reduces the beam-beam tune spread and hence Landau damping. We report on experiments and simulations carried out to understand the impact of coherent modes on operation with electron lenses.

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“…To minimize the beam-beam tune spread and to compensate the non-linear beam-beam resonance driving terms, head-on beam-beam compensation with electron lenses (elenses) is adopted for the RHIC [2,3,4]. Two e-lenses are being installed on either side of IP10, one for the Blue ring and one for the Yellow ring.…”

Section: Introductionmentioning

confidence: 99%

Beam-beam observations in the RHIC

Luo,

Fischer

2014

Preprint

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The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has been in operation since 2000. Over the past decade, the luminosity in the polarized proton (p-p) operations has increased by more than one order of magnitude. The maximum total beambeam tune shift with two collisions has reached 0.018. The beam-beam interaction leads to large tune spread, emittance growth, and short beam and luminosity lifetimes. In this article, we review the beam-beam observations during the previous RHIC p-p runs. The mechanism for particle loss is presented. The intra-beam scattering (IBS) contributions to emittance and bunch length growths are calculated and compared with the measurements. Finally, we will discuss current limits in the RHIC p-p operations and their solutions.

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Head-on beam-beam compensation in RHIC

Cited by 5 publications

References 19 publications

Beam–beam simulation code BBSIM for particle accelerators

Beam–beam simulation code BBSIM for particle accelerators

Coherent beam-beam experiments and implications for head-on compensation

Beam-beam observations in the RHIC

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