Simulation of the beam halo from the beam-beam interaction

Chen, T; Irwin, J.; Siemann, R.H.

doi:10.1103/physreve.49.2323

Cited by 18 publications

(14 citation statements)

References 8 publications

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“…All the above codes were written for lepton colliders. Remarkable results were obtained by D. Shatilov [20] and by T. Chen [21], who superposed simulated beam density distributions and resonance lines, calculated in first order perturbation theory, on the transverse action space, and, thereby, revealed the role of individual resonances in the tail formation. Synchro-betatron resonances of typical order 5 to 8 were found to be important in PEP-II.…”

Section: Generation Of Tailsmentioning

confidence: 80%

“…The two key requirements for this recipe to work are, first, randomness (e.g., due to quantum fluctuation) and, second, reaching an equilibrium at each step. This computing scheme was implemented in two independent codes by D. Shatilov ('lifetrac' program) in 1992 [20], and by T. Chen and coworkers around 1993 [21]. These codes do not only include the beam-beam dynamics at the primary IP, but also model some additional effects such as frequent small-angle scattering, and parasitic collisions.…”

Section: Generation Of Tailsmentioning

confidence: 99%

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Halo Formation due to Beam-Beam Interaction

Zimmermann¹

2003

AIP Conference Proceedings

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In colliding-beam storage rings transverse and longitudinal beam halo is generated, or depleted, by the effect of head-on and long-range beam-beam collisions. Measurements from several past and present lepton or hadron colliders are compared with simulations and analytical models, highlighting a few halo-specific techniques. This overview concludes with an outlook on the future Large Hadron Collider (LHC), where long-range beam-beam collisions are the dominant perturbation of particle motion and beam-beam compensation schemes appear a promising remedy. CERN, AB DivisionAbstract. In colliding-beam storage rings transverse and longitudinal beam halo is generated, or depleted, by the effect of head-on and long-range beam-beam collisions. Measurements from several past and present lepton or hadron colliders are compared with simulations and analytical models, highlighting a few halo-specific techniques. This overview concludes with an outlook on the future Large Hadron Collider (LHC), where long-range beam-beam collisions are the dominant perturbation of particle motion and beam-beam compensation schemes appear a promising remedy.

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Section: Generation Of Tailsmentioning

confidence: 80%

Section: Generation Of Tailsmentioning

confidence: 99%

Halo Formation due to Beam-Beam Interaction

Zimmermann¹

2003

AIP Conference Proceedings

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“…In previous studies, we have shown that resonances are the dominant effect in tail formation [2] , as evidenced by the fact that the distributions follow resonances locations. The locations of resonances are not only determined by the beam-beam kick potential, but also by the nonlinearities of the lattice, primarily the tune shifts with amplitudes.…”

Section: The Lattice Nonlinearities-tune Shift With Amplitudesmentioning

confidence: 75%

“…

The halo distribution due to the beam-beam interaction in circular electron-positron colliders is simulated with a program which uses a technique that saves a factor of hundreds to thousands of CPU time [1,2] . The distribution and the interference between the beam-beam interaction and lattice nonlinearities has been investigated.

…”

mentioning

confidence: 99%

Studies of halo distributions under beam-beam interaction

Chen¹,

Irwin²,

Siemann³

Proceedings Particle Accelerator Conference

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“…Krishnagopal and R. Siemann[ 11 have established that it is essential to retain the finite longitudinal thickness of the beam when simulating the beam-beam interaction. Present beam-beam simulation codes [2] represent the thick interaction as a set of thin beam-beam kicks. Since the thin beam-beam kick for a bi-Gaussian distribution is usually represented by the Erskine-Bassetti [3] formula involving the evaluation of two complex error functions, the calculation is computer intensive and the representation of the thick beam-beam interaction as a set of slices slows down the simulation by a factor roughly equal to the number of slices.…”

Section: Introductionmentioning

confidence: 99%

A map for the thick beam-beam interaction

Irwin

Chen

Proceedings Particle Accelerator Conference

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We give a closed-form expression for the thick beambeam interaction for a small disruption parameter, as typical in electron-positron storage rings. The dependence on transverse angle and position of the particle trajectory as well as the longitudinal position of collision and the waistmodified shape of the beam distribution are included. Large incident angles, as are present for beam-halo particles or for large crossing-angle geometry, are accurately represented. The closed-form expression is well approximated by polynomials times the complex error function. Comparisons with multi-slice representations show even the first order terms are more accurate than a five slice representation, saving a factor of 5 in computation time.

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Simulation of the beam halo from the beam-beam interaction

Cited by 18 publications

References 8 publications

Halo Formation due to Beam-Beam Interaction

Halo Formation due to Beam-Beam Interaction

Studies of halo distributions under beam-beam interaction

A map for the thick beam-beam interaction

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