Wakefield suppression in high gradient linacs for lepton linear colliders

Jones, R.M.

doi:10.1103/physrevstab.12.104801

Cited by 36 publications

(25 citation statements)

References 16 publications

(22 reference statements)

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“…There are several techniques that can be used to solve the BBU problem, depending on the particular application and beam parameters. 46 In some cases it is sufficient to detune the dipole mode from cell to cell, avoiding a complete build up mechanism. In high intensity Linacs nevertheless a strong damping of the dipole mode is often necessary.…”

Section: Beam Break Upmentioning

confidence: 99%

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Electron Linac design to drive bright Compton back-scattering gamma-ray sources

Bacci

Alesini

Antici

et al. 2013

Journal of Applied Physics

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The technological development in the field of high brightness linear accelerators and high energy/high quality lasers enables today designing high brilliance Compton-X and Gamma-photon beams suitable for a wide range of applications in the innovative field of nuclear photonics. The challenging requirements of this kind of source comprise: tunable energy (1-20 MeV), very narrow bandwidth (0.3%), and high spectral density (10 4 photons/s/eV). We present here a study focused on the design and the optimization of an electron Linac aimed to meet the source specifications of the European Extreme Light Infrastructure-Nuclear Physics project, currently funded and seeking for an innovative machine design in order to outperform state-of-the-art facilities. We show that the phase space density of the electron beam, at the collision point against the laser pulse, is the main quality factor characterizing the Linac. V C 2013 AIP Publishing LLC. [http://dx

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Section: Beam Break Upmentioning

confidence: 99%

“…In high intensity Linacs nevertheless a strong damping of the dipole mode is often necessary. In our case we have adopted a damping design for the C-band structures (the booster) similar to the X band CLIC (Compact Linear Collider) structures [45][46][47] designed at CERN, but with a quite lower damping, which is shown in Fig. 19.…”

Section: Beam Break Upmentioning

confidence: 99%

Electron Linac design to drive bright Compton back-scattering gamma-ray sources

Bacci

Alesini

Antici

et al. 2013

Journal of Applied Physics

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“…When a charged particle, or indeed a bunch of electrons traverses a cavity, it self-excites an electromagnetic field which can be conveniently represented in terms of a wakefield. This field can seriously degrade the electron beam quality if left unchecked [6] and, in the worst case, can cause BBU (Beam Breakup) [7]. The wakefield can be decomposed in a multipole expansion of modes.…”

Section: Wakefields and Higher Order Modesmentioning

confidence: 99%

Beam phase retrieval based on higher order modes in cylindrical superconducting radio frequency cavities

Shi

Baboi

Jones

2018

Review of Scientific Instruments

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The control of beam phase relative to the accelerating RF field within a superconducting cavity is important in many accelerator applications and is of particular importance for a free electron laser facility. As standard practice, the phase is usually inferred from the beam-induced transient field with respect to a timing reference. We report here on an alternative and novel means of beam phase determination based on beam-excited higher order electromagnetic modes and the accelerating electromagnetic mode, which are conveniently available from the same coupler. The monopole modes are immune to the electron beam offset and therefore are best suited for the task. A coupled circuit model is used to assist the development and to rapidly assess the facility of the method. Simulations based on the circuit model indicate that the resolution of this system depends critically on the signal to noise ratio. Beam-based measurements with a test setup were carried out at the European XFEL, Germany. Based on this new method we have routinely obtained a resolution of 0.1°. The best resolution observed with the current setup was 0.03°. These results agree very well with the predictions from those predicted by a circuit model. The system investigated here can be used to provide diagnostic information for the current LLRF system employed in the European XFEL. To this end, the associated electronics are under development. This monitor is the first of its kind that can deliver direct and online measurements of the beam phase with respect to the RF field.

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“…This is realized by the evaluation of the very low Q values in addition to the frequency determination of the dipole modes. Aside from the choke-mode structure, there are other kinds of heavily damped structures, such as the waveguide damped structure and iris slotted damped structure [20]. These structure designs have drawn much interest in the study of high-gradient normal conducting accelerating structures.…”

Section: Introductionmentioning

confidence: 99%

Beam-induced wakefield observation inX-band choke-mode cavities

Zha

Jing

Qiu

et al. 2016

Phys. Rev. Accel. Beams

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The X-band choke-mode structure is currently being studied as an alternative design for the accelerating structure of the compact linear collider (CLIC) main linac. The geometry of the choke-mode structure is designed to ensure the strong suppression of the beam-induced long-range transverse wakefield and therefore maintain the stability and quality of the beam in the CLIC main linac. Experiments conducted at the Argonne Wakefield Accelerator Facility are presented in this study to verify the design of the wakefield suppressor. The beam-induced radio frequency (rf) signals in a three-cell choke-mode structure were measured, and measured results show good agreement with the simulation results. The measured results also show strong damping in high-order dipolar modes with a quality factor Q of 10 to 20. The difference between the frequencies of the first and second dipole modes is about 3 GHz, which validates the special design of the cancelling dipole modes at the time of the succeeding bunch (0.5 ns).

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Wakefield suppression in high gradient linacs for lepton linear colliders

Cited by 36 publications

References 16 publications

Electron Linac design to drive bright Compton back-scattering gamma-ray sources

Electron Linac design to drive bright Compton back-scattering gamma-ray sources

Beam phase retrieval based on higher order modes in cylindrical superconducting radio frequency cavities

Beam-induced wakefield observation inX-band choke-mode cavities

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