Dispersion and energy compensation in high-gradient linacs for lepton colliders

Jones, R.M.; Dolgashev, Valery; Wang, Juwen W.

doi:10.1103/physrevstab.12.051001

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…24 is ideal because, in reality, one has to consider the distortions due to the finite bandwidth of the rf system and klystron. Also the dispersive effects of the TW structure [47] will affect the final accelerated gradient sampled by bunches.…”

Section: Beam Loading Compensationmentioning

confidence: 99%

Design of high gradient, high repetition rate dampedC-band rf structures

Alesini

Bellaveglia

Bini

et al. 2017

Phys. Rev. Accel. Beams

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The gamma beam system of the European Extreme Light Infrastructure-Nuclear Physics project foresees the use of a multibunch train colliding with a high intensity recirculated laser pulse. The linac energy booster is composed of 12 traveling wave C-band structures, 1.8 m long with a field phase advance per cell of 2π=3 and a repetition rate of 100 Hz. Because of the multibunch operation, the structures have been designed with a dipole higher order mode (HOM) damping system to avoid beam breakup (BBU). They are quasiconstant gradient structures with symmetric input couplers and a very effective damping of the HOMs in each cell based on silicon carbide (SiC) rf absorbers coupled to each cell through waveguides. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce the cost of the structures. In the paper, after a review of the beam dynamics issues related to the BBU effects, we discuss the electromagnetic and thermomechanic design criteria of the structures. We also illustrate the criteria to compensate the beam loading and the rf measurements that show the effectiveness of the HOM damping.

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Section: Beam Loading Compensationmentioning

confidence: 99%

Design of high gradient, high repetition rate dampedC-band rf structures

Alesini

Bellaveglia

Bini

et al. 2017

Phys. Rev. Accel. Beams

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“…4. Two ramping periods with different slope in the pulse shape is the dedicate design for beam loading compensation [25,26]. The maximum temperature rise is at the end of the flattop in the rf pulse, as seen in Fig.…”

Section: Geometry Optimization Of Waveguide Damped Cellsmentioning

confidence: 99%

Design and optimization of Compact Linear Collider main linac accelerating structure

Zha

2016

Phys. Rev. Accel. Beams

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The Compact Linear Collider (CLIC) main linac uses waveguide damped structure as its baseline design. The current baseline structure design written in the CLIC Conceptual Design Report is named "CLIC-G." Recent activities on the CLIC-G design including high power tests on structure prototypes and the study of machining cost assessment had raised the need of reoptimizing the structure design to minimize the machining cost and the pulse surface temperature rise. This work presents optimization of the structure geometry, high-order-mode (HOM) damping loads and the design of a HOM-free power splitter for the input coupler. Compared to the current baseline design CLIC-G, the new structure design reduced the pulse surface temperature rise, input power and manufacturing cost and achieves better suppression to the long range transverse wakefield. Cell disks and damping loads for the new structure design are also more compact than those of the CLIC-G design.

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“…For the first time an analytical solution of the gradient profile in a loaded arbitrary traveling wave (TW) structure was recently proposed in [12] but for the steady state regime only. The comprehensive numerical analysis of an arbitrary TW structure including the effects of a signal dispersion was recently published in [13] using the circuit model and mode matching technique.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions for transient and steady state beam loading in arbitrary traveling wave accelerating structures

Lunin

Yakovlev

2011

Phys. Rev. ST Accel. Beams

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Analytical solutions are derived for both transient and steady state gradient distributions in the traveling wave (TW) accelerating structures with arbitrary variation of parameters over the structure length. The results of the unloaded and beam loaded cases are presented. Finally, the exact analytical shape of the rf pulse waveform was found in order to apply the transient beam loading compensation scheme during the structure filling time. The obtained theoretical formulas were cross-checked by direct numerical simulations on the CLIC main linac accelerating structure and demonstrated a good agreement. The proposed methods provide a fast and reliable tool for the initial stage of the TW structure analysis.

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Dispersion and energy compensation in high-gradient linacs for lepton colliders

Cited by 11 publications

References 7 publications

Design of high gradient, high repetition rate dampedC-band rf structures

Design of high gradient, high repetition rate dampedC-band rf structures

Design and optimization of Compact Linear Collider main linac accelerating structure

Analytical solutions for transient and steady state beam loading in arbitrary traveling wave accelerating structures

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