Circular modes for flat beams in the LHC

Burov, A.

doi:10.1103/physrevstab.16.061002

Cited by 5 publications

(4 citation statements)

References 5 publications

(4 reference statements)

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“…They are run at a beam pulse frequency of 1 Hz. 3 Each wire-scanner has three wires to measure the 1D projection of the distribution onto the x, y and u axes, where u is tilted at an angle φ = π/4 above the x axis; xx , yy , and uu can be extracted from these projections, as well as xy from…”

Section: Implementation In the Snsmentioning

confidence: 99%

“…A hadron beam with a uniform charge density, elliptical transverse profile, and small four-dimensional (4D) emittance could mitigate space charge effects in circular accelerators and improve collider performance [1,2,3]. A phase space painting method to generate such a distribution is being tested in the Spallation Neutron Source (SNS) accumulator ring [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Four-dimensional emittance measurement at the Spallation Neutron Source

Hoover¹,

Evans²

2022

Preprint

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A hadron beam with a uniform charge density, elliptical transverse profile, and small four-dimensional (4D) emittance could mitigate space charge effects in circular accelerators and improve collider performance. A phase space painting method to generate such a distribution is being tested in the Spallation Neutron Source (SNS) accumulator ring. A critical component of these efforts is to measure the 4D emittance of the beam. Reconstruction of the 4D emittance from wire-scanner data is a well-known technique. In this paper, we discuss the implementation of a variant of the multi-optics method using the four available wire-scanners near the SNS target, as well as the modification of the wire-scanner region to utilize the fixed-optics method -a method that is preferred due to its speed but can potentially lead to unacceptable bias and uncertainty in the reconstructed emittances. We then demonstrate the usefulness of the fixed-optics method by reconstructing the 4D emittance as a function of time during accumulation in the SNS ring.

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Section: Implementation In the Snsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Four-dimensional emittance measurement at the Spallation Neutron Source

Hoover¹,

Evans²

2022

Preprint

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“…In colliders, it is the case for interaction regions where large solenoidal fields and compensation elements are present. Atypical optics schemes based on strong coupling insertions have also been proposed to improve the performance of lepton and hadron colliders, such as the "Möbius accelerator" [3], planar-to-circular beam adapters for circular modes operation [4], and round beam operation for lepton storage rings [5,6].…”

Section: Introductionmentioning

confidence: 99%

Parametrizations of coupled betatron motion for strongly coupled lattices

Vanwelde,

Hernalsteens,

Bogacz

et al. 2023

J. Inst.

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The coupling of transverse motion is a natural occurrence in particle accelerators, either in the form of a residual coupling arising from imperfections or originating by design from strong systematic coupling fields. While the first can be treated perturbatively, the latter requires a robust approach adapted to strongly coupled optics, and a parametrization of the linear optics must be performed to explore beam dynamics in such peculiar lattices. This work highlights the key physical interpretations of the main parametrization formalisms to describe linear coupled optics, along with explicit links and comparisons of these parametrizations. Concepts rarely illustrated in other works, such as forced mode flips and local coupling, are explored in detail, clarifying some anomalies that can arise in lattice functions. The analytical methods have been implemented in a reference Python package and connected with ray-tracing and integration codes to explore examples of strongly coupled lattices, which are discussed in detail to highlight the key physical interpretations of the parametrizations and characteristics of the lattices.

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“…In colliders, it is the case for interaction regions where large solenoidal fields and compensation elements are present. Atypical optics schemes based on strong coupling insertions have also been proposed to improve the performance of lepton and hadron colliders, such as the "Möbius accelerator" [4], planar-to-circular beam adapters for circular modes operation [5] and round beam operation for lepton storage rings [6].…”

Section: Introductionmentioning

confidence: 99%