Investigation of the Coherent Beam-Beam Effects in the ISR

Hemery, J.Y.; Hofmann, A.; Koutchouk, J. P.; Myers, Steve; Vos, L.

doi:10.1109/tns.1981.4331735

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…This location enables for an artificially induced LR interaction between the two beams and simultaneously allows for a minimum phase advance between the LR interaction and DC wires (6 deg). Additionally, this location has sufficient aperture for an orbit scan with the range of interest (3)(4)(5)(6)(7)(8)(9)(10). Figure 18 shows the trajectories of the Blue and Yellow rings with the LR interaction set at approximately 3:1.…”

Section: Long-range Effects With Head-on Collisionsmentioning

confidence: 99%

“…Beam-beam effects have limited the performance of previous and existing hadron colliders [1][2][3] such as the intersecting storage ring (ISR) [4][5][6], Sp" pS [7][8][9][10], Tevatron [11][12][13], and RHIC [14,15], and are also expected to limit the performance of the LHC [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Long-range beam-beam experiments in the Relativistic Heavy Ion Collider

Calaga

Fischer

Robert‐Demolaize

et al. 2011

Phys. Rev. ST Accel. Beams

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Long-range beam-beam effects are a potential limit to the LHC performance with the nominal design parameters, and certain upgrade scenarios under discussion. To mitigate long-range effects, current carrying wires parallel to the beam were proposed and space is reserved in the LHC for such wires. Two current carrying wires were installed in the Relativistic Heavy Ion Collider to study the effect of strong long-range beam-beam effects in a collider, as well as test the compensation of a single long-range interaction. The experimental data were used to benchmark simulations. We summarize this work.

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Section: Long-range Effects With Head-on Collisionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-range beam-beam experiments in the Relativistic Heavy Ion Collider

Calaga

Fischer

Robert‐Demolaize

et al. 2011

Phys. Rev. ST Accel. Beams

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show abstract

“…In the presence of colliding beams, BTFs have been also used to estimate the tune spread in the presence of coherent beam-beam modes [11]. The BTFs can detect excited coherent modes in the beams [6,12] and can give information about the beam-beam coupling by measuring the cross talk between two colliding beams [13]. In the LHC, the BTF system was installed in order to give insights into Landau damping of the beams by measuring the SD and comparing with the theoretical models.…”

Section: Introductionmentioning

confidence: 99%

Beam transfer function measurements used to probe the transverse Landau damping at the LHC

Tambasco

Pieloni

Barranco

et al. 2020

Phys. Rev. Accel. Beams

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The Landau damping mechanism stabilizes the impedance driven head-tail modes in hadron synchrotrons. Because of the frequent coherent beam instabilities observed in the Large Hadron Collider in 2012, the Landau damping of the beams was doubted. Therefore, a transverse beam transfer function (BTF) system was installed in order to probe the transverse Landau damping of the beams and compare the measurements with expectations. The results of the BTF measurements acquired during several experiments in the LHC are summarized including different machine configurations. The method developed for the data analysis is described, and the comparison between the models and the measurements is also presented.

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“…In high energy storage-ring colliders, the beam-beam interactions are known to cause emittance growth and a reduction of beam life time, and to limit the collider luminosity [1][2][3][4][5][6][7]. It has been a key issue in a high energy collider to simulate the beam-beam interaction accurately and to mitigate the interaction effects.…”

Section: Introductionmentioning

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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Investigation of the Coherent Beam-Beam Effects in the ISR

Cited by 4 publications

References 2 publications

Long-range beam-beam experiments in the Relativistic Heavy Ion Collider

Long-range beam-beam experiments in the Relativistic Heavy Ion Collider

Beam transfer function measurements used to probe the transverse Landau damping at the LHC

Beam–beam simulation code BBSIM for particle accelerators

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