Paper |
Title |
Page |
TUXGBE2 |
Study of Ultra-High Gradient Acceleration in Carbon Nanotube Arrays |
599 |
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- J. Resta-López, A.S. Alexandrova, V. Rodin, Y. Wei, C.P. Welsch, G.X. Xia
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- Y. M. Li, Y. Zhao
UMAN, Manchester, United Kingdom
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Solid-state based wakefield acceleration of charged particles was previously proposed to obtain extremely high gradients on the order of 1 − 10 TeV/m. In recent years the possibility of using either metallic or carbon nanotube structures is attracting new attention. The use of carbon nanotubes would allow us to accelerate and channel particles overcoming many of the limitations of using natural crystals, e.g. channeling aperture restrictions and thermal-mechanical robustness issues. In this paper, we propose a potential proof of concept experiment using carbon nanotube arrays, assuming the beam parameters and conditions of accelerator facilities already available, such as CLEAR at CERN and CLARA at Daresbury. The acceleration performance of carbon nanotube arrays is investigated by using a 2D Particle-In-Cell (PIC) model based on a multi-hollow plasma. Optimum experimental beam parameters and system layout are discussed.
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Slides TUXGBE2 [27.290 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-TUXGBE2
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TUPML022 |
Assessment of Transverse Instabilities in Proton Driven Hollow Plasma Wakefield Acceleration |
1581 |
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- Y. M. Li, G.X. Xia, Y. Zhao
UMAN, Manchester, United Kingdom
- S.J. Gessner
CERN, Geneva, Switzerland
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Hollow plasma has been introduced into the proton-driven plasma wakefield accelerators to overcome the issue of beam quality degradation caused by the nonlinear transverse wakefields varying in radius and time in uniform plasma. It has been demonstrated in simulations that the electrons can be accelerated to energy frontier with well-preserved beam quality in a long hollow plasma channel. However, this scheme imposes tight requirements on the beam-channel alignment. Otherwise asymmetric transverse wakefields along the axis are induced, which could distort the driving bunch and deteriorate the witness beam quality. In this paper, by means of the 2D cartesian particle-in-cell simulations, we examine the potentially detrimental effects induced by the driving beam-channel offset and initial driver tilt, and then propose and assess the solutions to these driver inaccuracy issues.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML022
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TUPML023 |
Amplitude Enhancement of the Self-Modulated Plasma Wakefields |
1585 |
SUSPF042 |
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- Y. M. Li, G.X. Xia, Y. Zhao
UMAN, Manchester, United Kingdom
- K.V. Lotov, A. Sosedkin
Budker INP & NSU, Novosibirsk, Russia
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Seeded Self-modulation (SSM) has been demonstrated to transform a long proton bunch into many equidistant micro-bunches (e.g., the AWAKE case), which then resonantly excite strong wakefields. However, the wakefields in a uniform plasma suffer from a quick amplitude drop after reaching the peak. This is caused by a significant decrease of the wake phase velocity during self-modulation. A large number of protons slip out of focusing and decelerating regions and get lost, and thus cannot contribute to the wakefield growth. Previously suggested solutions incorporate a sharp or a linear plasma longitudinal density increase which can compensate the backward phase shift and therefore enhance the wakefields. In this paper, we propose a new plasma density profile, which can further boost the wakefield amplitude by 30%. More importantly, almost 24% of protons initially located along one plasma period survive in a micro-bunch after modulation. The underlying physics is discussed.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML023
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