Wake fields measurements

Palumbo, L.; Vaccaro, V. G.

doi:10.1007/bfb0018294

Cited by 14 publications

(11 citation statements)

References 10 publications

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“…with ω n = ω 0 1 − (2Q) −2 and α = ω 0 /2Q [13]. Deflected charges moving off-axis cause further excitation of the resonant mode intensifying the parasitic interaction.…”

Section: The Process Of Beam Break-upmentioning

confidence: 99%

Modeling and mitigation of long-range wakefields for advanced linear colliders

Bosco

Camacho

Carillo

et al. 2023

J. Phys.: Conf. Ser.

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The luminosity requirements of TeV-class linear colliders demand use of intense charged beams at high repetition rates. Such features imply multi-bunch operation with long current trains accelerated over the km length scale. Consequently, particle beams are exposed to the mutual parasitic interaction due to the long-range wakefields excited by the leading bunches in the accelerating structures. Such perturbations to the motion induce transverse oscillations of the bunches, potentially leading to instabilities such as transverse beam break-up. Here we present a dedicated tracking code that studies the effects of long-range transverse wakefield interaction among different bunches in linear accelerators. Being described by means of an efficient matrix formalism, such effects can be included while preserving short computational times. As a reference case, we use our code to investigate the performance of a state-of-the-art linear collider currently under design and, in addition, we discuss possible mitigation techniques based on frequency detuning and damping.

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“…with ω n = ω 0 1 − (2Q) −2 and α = ω 0 /2Q [13]. Deflected charges moving off-axis cause further excitation of the resonant mode intensifying the parasitic interaction.…”

Section: The Process Of Beam Break-upmentioning

confidence: 99%

Modeling and mitigation of long-range wakefields for advanced linear colliders

Bosco

Camacho

Carillo

et al. 2023

J. Phys.: Conf. Ser.

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“…The electromagnetic interaction of a component with the beam is modeled by its impedance analogously as the Ohm's law [5]. In this framework, an Electro-Magnetic resonance is modeled as a beam impedance at a single frequency.…”

Section: Introductionmentioning

confidence: 99%

Reducing parasitic resonances in particle accelerators components by broadband Higher–Order–Mode couplers

et al. 2019

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In particle accelerator components, parasitic resonances must be reduced because they heat up the equipment and cause beam instabilities. In this paper, a method for designing and characterizing Higher Order Mode (HOM) couplers for reducing such resonances in a broad bandwidth is proposed. A case study is considered for a specific component, called QuattroTank, showing geometrical discontinuities and thus causing significant electro-magnetic resonances. Results of numerical simulation and experimental emulation prove the capability of the proposed method to reduce the peaks and the Q-factor of the resonances.

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“…In this paper we present a preliminary study of the collective effects in FCC-ee due to parasitic electromagnetic interaction of the circulating beams with the surrounding vacuum chamber expressed in terms of wake fields and beam coupling impedances [12]. We will consider only the Z resonance option since it is more vulnerable to collective effects and instabilities because of the lower beam energy, longer damping times, higher beam intensities and highest number of bunches.…”

Section: Introductionmentioning

confidence: 99%

Study of collective effects in the FCC-ee collider

Zobov

Belli

Castorina

et al. 2019

J. Phys.: Conf. Ser.

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The Future Circular Collider (FCC) study aims at designing different options of a post-LHC collider. The high luminosity electron-positron collider FCC-ee based on the crab waist concept is considered as an intermediate step on the way towards FCC-hh, a 100 TeV hadron collider using the same tunnel of about 100 km. Due to a high intensity of circulating beams the impact of collective effects on FCC-ee performance has to be carefully analyzed. In this paper we evaluate beam coupling impedance of the FCC-ee vacuum chamber, estimate thresholds and rise times of eventual single-and multibunch beam instabilities and discuss possible measures to mitigate them.

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Wake fields measurements

Cited by 14 publications

References 10 publications

Modeling and mitigation of long-range wakefields for advanced linear colliders

Modeling and mitigation of long-range wakefields for advanced linear colliders

Reducing parasitic resonances in particle accelerators components by broadband Higher–Order–Mode couplers

Study of collective effects in the FCC-ee collider

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