Effect of local linear coupling on linear and nonlinear observables in circular accelerators

Hofer, Michaël; Tomás, Rogelio

doi:10.1103/physrevaccelbeams.23.094001

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…A notable excursion is observed in the injection straight for the C-RDT H(0, 1). Following the derivations presented in [26,27], this indicates a strong influence of the horizontal motion on the vertical one here. This may be of concern as both the horizontal and vertical kicker are located here.…”

Section: (Combined-)resonance Driving Termssupporting

confidence: 63%

Nonlinear Optics Measurements in IOTA

Hofer

Valishev

García

et al. 2021

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Nonlinear integrable optics is a recently proposed accelerator lattice design approach which allows to generate an amplitude dependent tune shift which is needed in high brightness accelerators to mitigate fast coherent instabilities. Whereas usually octupoles are used to achieve this task, this concept allows doing so without exciting any resonances, in turn preventing any particle loss. The concept is based around a special magnet design, together with specific constraints on the optics of the accelerator. To study such a system, the Integrable Optics Test Accelerator (IOTA) was recently constructed and commissioned at Fermilab. For the assessment of the performance of this concept, good knowledge of the optics and the (non-)linear dynamics without the special magnet is of key importance. As such, measurements were conducted in the IOTA ring, using the captured turn-by-turn data by the beam position monitors after excitation to infer quantities such as amplitude detuning and resonance driving terms. In this note, first results of these measurements are presented.

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Section: (Combined-)resonance Driving Termssupporting

confidence: 63%

Nonlinear Optics Measurements in IOTA

Hofer

Valishev

García

et al. 2021

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“…Simulations do not explain the larger value for Beam 1 in 2022 while good agreement is observed for the other cases. This implies that the Beam 1 skew sextupolar model sources should be improved, probably requiring including magnet alignment errors or linear imperfections as 𝛽-beating and coupling [24].…”

Section: Jinst 19 T05010mentioning

confidence: 99%

Optics for Landau damping with minimized octupolar resonances in the LHC

Tomás,

Carlier,

Chudoba

et al. 2024

J. Inst.

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Operation of the Large Hadron Collider (LHC) requires strong octupolar magnetic fields to suppress coherent beam instabilities. The amplitude detuning that is generated by these octupolar magnetic fields brings the tune of individual particles close to harmful resonances, which are mostly driven by the octupolar fields themselves. In 2023, new optics were deployed in the LHC at injection with optimized betatronic phase advances to minimize the resonances from the octupolar fields without affecting the amplitude detuning. This paper reports on the optics design, commissioning, and lifetime measurements performed to validate the optics.

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“…More than that, testing a 60°optics in the LHC also enables interesting complementary studies, which will allow new insights on magnet imperfections, sextupole spool piece misalignments [73], linear and nonlinear coupling [74,75] and the corresponding correction techniques. Indeed, understanding optics with different FODOcell phase advance for the same lattice will not only help to constrain error sources, but will, in addition, probe optics flexibility, which is a challenge for future machines such as the FCC-ee [7], which features a 60°and a 90°optics.…”

Section: Lhc Optics With 60°fodo-cell Phase Advancementioning

confidence: 99%

Lattice and optics options for possible energy upgrades of the Large Hadron Collider

Keintzel

Tomás

Bruce

et al. 2020

Phys. Rev. Accel. Beams

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Studies of possible energy upgrades of the Large Hadron Collider (LHC) aim at increasing the current nominal beam energy of 7 TeV in view of expanding the discovery potential and physics reach of the LHC. Some critical aspects of the feasibility of partial or full energy upgrades are studied here, together with novel mitigation measures. Higher beam energies can be realized by pushing the installed main dipoles to their limits or by replacing different fractions of installed magnets. Moreover, a revised lattice design for a full energy upgrade, also known as the high-energy LHC (HE-LHC), is presented. The studies reported focus on the linear optics design and on the lattice layout. In particular, an optics with 60°transverse phase advance in the regular arc cells, meant to alleviate the strength requirements for the main quadrupoles, has been designed in view of possible beam tests during the next LHC run 3. The methods developed in this article, for matching the ring geometry to a reference tunnel, for improving the beam aperture, and for minimizing the required field strengths for new high-energy LHC-like machines, will also be applicable to other future circular collider projects.

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Effect of local linear coupling on linear and nonlinear observables in circular accelerators

Cited by 7 publications

References 18 publications

Nonlinear Optics Measurements in IOTA

Nonlinear Optics Measurements in IOTA

Optics for Landau damping with minimized octupolar resonances in the LHC

Lattice and optics options for possible energy upgrades of the Large Hadron Collider

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