Physics of Phase Space Matching for Staging Plasma and Traditional Accelerator Components Using Longitudinally Tailored Plasma Profiles

Xu, Xinlu; Hua, Jianfei; Wu, Yipeng; Zhang, C. J.; Li, F.; Wan, Y.; Pai, Chih-Hao; Lü, Wei; An, Weiming; Yu, Peicheng; Hogan, Mark; Joshi, C.; Mori, W. B.

doi:10.1103/physrevlett.116.124801

Cited by 88 publications

(64 citation statements)

References 46 publications

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“…1,2 Strong electric fields of the plasma wakefields guarantee the accelerating and focusing forces orders of magnitudes larger than the conventional accelerators. However, there remain several issues for the practical use of the plasma wakefield accelerators, such as difficulties of staging, 3 unstable propagation of drivers, 4 substantial energy spread, 5 and emittance growth of witness bunch, 6 to mention a few of them. For the successful injection of the witness bunch into the accelerating wakefield region of an ion cavity, its normalized transverse and longitudinal sizes are required to be much smaller than unity, k p r ( 1, where k p ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi n 0 e 2 = 0 m e c 2 p is the plasma wave number.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal phase space dynamics of witness bunch during the Trojan Horse injection for plasma-based particle accelerators

et al. 2019

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In the Trojan Horse injection process for plasma-based particle accelerators, we have investigated how the longitudinal phase space of the witness bunch would be governed by the parameters of the ionization laser and background plasma in the limit of quasistatic wakefield approximation. The tunneling ionization rate distribution by the laser pulse is introduced to describe the ionization time interval and initial distribution of the witness electrons. The quasilinear (or equivalently quasistatic) regime of the charged particle beam-driven wakefield is considered to make the phase of the wake potential constant in time in the driver beam frame. In the simulations, it is shown that the ionization laser phase on the quasistatic wake potential determines the longitudinal space-charge field of the witness bunch. We also find that the relative energy spread of the witness bunch can be estimated by the sum of three effects: The ionization time interval, wakefield slope, and space-charge fields of the witness bunch. Analytical expressions for the characteristic distance from the ionization to trapping positions, rms length, and relative energy spread of the witness bunch are obtained approximately and compared with the particle-in-cell simulations.Published under license by AIP Publishing. https://doi. Phys. Plasmas 13, 056709 (2006). FIG. 6. The average energy and energy spread of the witness bunch for k p n i ¼ -3.3. (blue dashed line) The asymptotic behavior of the relative energy spread. (blue solid curve) The analytical expression (10) for the relative energy spread. (blue circles) The PIC simulation result of the relative energy spread. (red circles) The PIC simulation result of the average energy. Physics of Plasmas ARTICLEscitation.org/journal/php

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Section: Introductionmentioning

confidence: 99%

Longitudinal phase space dynamics of witness bunch during the Trojan Horse injection for plasma-based particle accelerators

et al. 2019

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“…Better control on the final direction can be achieved by fine tailoring of the ramp, as done in Ref. [26] for emittance conservation. As can be seen in Fig.…”

mentioning

confidence: 99%

Pulse front tilt steering in laser plasma accelerators

Thévenet

Mittelberger

Nakamura

et al. 2019

Phys. Rev. Accel. Beams

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We report on the effect of laser spatiotemporal coupling in laser plasma accelerators. Pulse front tilt in the driving laser causes asymmetry in the wakefield, resulting in deflection of the electron beam from the laser axis. We explore the physical mechanisms and propose a quantitative model of electron steering, which is validated with particle-in-cell simulations. Even a small amount of pulse front tilt can result in beam steering in the final down ramp of the plasma profile, which may lead to unexpected beam-pointing errors or fluctuations. On the other hand, it can be used to govern the final beam direction, which has consequences for staging laser plasma accelerators in a high-energy physics collider as well as x-ray generation for biological imaging.

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“…Electron-bunch optimization shows that a small mean size and a small divergence is beneficial for both, the photon production, as well as the bandwidth of the Thomson source. LWFA-accelerated electron bunches are promoted with small emittances [92,107] and theoretical means have been published aiming at a divergence reduction and suppressed emittance growth at the transition from plasma to vacuum [108,109]. The photon production and bandwidth are determined by the mean electron bunch size, so that bunch focusing is not generally necessary.…”

Section: Interaction At the Plasma Exitmentioning

confidence: 99%

Design study for a compact laser-driven source for medical x-ray fluorescence imaging

Brümmer

Debus

Pausch

et al. 2020

Phys. Rev. Accel. Beams

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Thomson scattering sources with their hard x-ray pencil beams represent a promising candidate to drive high-resolution X-ray Fluorescence Imaging (XFI). As XFI is a scanning imaging modality, it specifically requires pencil-beam geometries along with a high beam mobility. In combination with laser-wakefield acceleration (LWFA) such sources could provide the compactness needed for a future transition into clinical application. A sufficient flux within a small bandwidth could enable in-vivo high-sensitivity XFI for early cancer diagnostics and pharmacokinetic imaging. We thus report on a specific all-laser driven source design directed at increasing the photon number within the bandwidth and opening angle defined by XFI conditions. Typical parameters of driver lasers and electron bunches from LWFA are utilized and controlled within realistic parameter regions on the basis of appropriate beam optics. An active plasma lens is implemented for chromatic focal control of the bunch. Source performance limits are identified and compared to existing x-ray sources with regard to their potential to be implemented in future clinical XFI.

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Physics of Phase Space Matching for Staging Plasma and Traditional Accelerator Components Using Longitudinally Tailored Plasma Profiles

Cited by 88 publications

References 46 publications

Longitudinal phase space dynamics of witness bunch during the Trojan Horse injection for plasma-based particle accelerators

Longitudinal phase space dynamics of witness bunch during the Trojan Horse injection for plasma-based particle accelerators

Pulse front tilt steering in laser plasma accelerators

Design study for a compact laser-driven source for medical x-ray fluorescence imaging

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