| Paper | Title | Other Keywords | Page |
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| TUPOJO02 | Multi-Harmonic Buncher (MHB) Studies for Protons and Ions in ESS-Bilbao | ISOL, proton, rfq, simulation | 334 |
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Multi-harmonic buncher cavities (MHB) are used in ion linacs to increase the bunch separation so the beam can be injected in rings or used in applications like time-of-flight experiments. The ideal saw-tooth electric field profile of the buncher is achieved in practice by adding several components of its Fourier expansion (multi-harmonics). ESS-Bilbao will develop* a MHB intended to be tested in the CERN-ISOLDE facility. The design and prototyping include the buncher device itself as well as the solid-state power amplifier (SSPA) to power it. The buncher design (finite elements and beam dynamics) has been carried out to optimize it for ISOLDE beams and frequencies of 1/10th of the radio-frequency quadrupole (RFQ) frequency. The testing of the cavity at ESS-Bilbao proton beam injector (before the RFQ) has also been studied.
* In the framework of the "Agreement for the Spanish Contribution to the Upgrade of the ATLAS, CMS, and LHCb Experiments and the new Projects for ISOLDE and nTOF" |
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Poster TUPOJO02 [0.802 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO02 | ||
| About • | Received ※ 22 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 04 September 2022 — Issue date ※ 15 September 2022 | ||
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| TUPOPA24 | Design of an X-Band Bunching and Accelerating System for AWAKE Run 2 | cavity, acceleration, electron, gun | 458 |
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| The AWAKE experiment at CERN demonstrated in its Run 1 that it is possible to accelerate electrons in plasma wakefields driven by a self-modulated proton bunch. In Run2, AWAKE aims to increase the accelerating gradient in the plasma even further and demonstrate beam quality in order to be ready for high-energy physics experiments. In this framework, a new electron injector, consisting of an S-band RF-gun and a subsequent X-band bunching and accelerating section, capable of producing very short bunches with a small emittance, has been designed. In this paper, two different configurations of the X-band section and their corresponding high-power distribution systems are presented. The first one consists of three identical cavities to bunch and accelerate the beam while the second one uses a separate short structure for velocity bunching followed by three long, pure accelerating structures. A discussion of the strengths and weaknesses of each configuration is carried out and beam dynamics aspects are analyzed. Finally the X-Band power distribution systems are described with particular attention to the choice of the klystron, the pulse compression system and the waveguide distribution. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA24 | ||
| About • | Received ※ 12 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022 | ||
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| TUPOPA27 | Conceptual Analysis of a Compact High Efficiency Klystron | klystron, cavity, wiggler, focusing | 466 |
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| Traditional klystron efficiencies are limited by the output electron beam harmonic current and energy spread. Increasing the amount of harmonic current produced in the klystron requires increasing the velocity bunching in the input cavity. Additional cavities may be used to improve the bunching, however they do so at additional cost and space requirements for the klystron. Moreover, at higher currents space charge counteracts this velocity bunching reducing the amount of harmonic current that can be produced. Our concept resolves these challenges by employing a new type of high-efficiency, multi-beam klystron. Our design consists of a single two-frequency input cavity, a wiggler, and an output cavity. The two-frequency input cavity approximates a linear function in time thereby increasing the harmonic content of the beam, while the wiggler provides strong longitudinal focusing to mitigate the effects of space charge. In this paper we provide the theoretical foundation for our design and present initial numerical calculations showing improved bunching from the harmonic mode and the wiggler. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA27 | ||
| About • | Received ※ 14 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 31 August 2022 | ||
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||