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Title: Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator

Abstract

Hollow channel plasma wakefield acceleration is a proposed method to provide high acceleration gradients for electrons and positrons alike: a key to future lepton colliders. However, beams which are misaligned from the channel axis induce strong transverse wakefields, deflecting beams and reducing the collider luminosity. This undesirable consequence sets a tight constraint on the alignment accuracy of the beam propagating through the channel. Direct measurements of beam misalignment-induced transverse wakefields are therefore essential for designing mitigation strategies. We present the first quantitative measurements of transverse wakefields in a hollow plasma channel, induced by an off-axis 20 GeV positron bunch, and measured with another 20 GeV lower charge trailing positron probe bunch. Furthermore, the measurements are largely consistent with theory.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1429140
Alternate Identifier(s):
OSTI ID: 1436473
Grant/Contract Number:  
AC02-76SF00515; SC0010064; SC0008491; SC0008316; 230450; PHY-1415386; OCI-1036224; ACI-1339893; PHY-0960344; 715807; 11425521; 11535006; 11175102; 2013CBA01501
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 120 Journal Issue: 12; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Lindstrøm, C. A., Adli, E., Allen, J. M., An, W., Beekman, C., Clarke, C. I., Clayton, C. E., Corde, S., Doche, A., Frederico, J., Gessner, S. J., Green, S. Z., Hogan, M. J., Joshi, C., Litos, M., Lu, W., Marsh, K. A., Mori, W. B., O’Shea, B. D., Vafaei-Najafabadi, N., and Yakimenko, V.. Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.124802.
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Lindstrøm, C. A., Adli, E., Allen, J. M., An, W., Beekman, C., Clarke, C. I., Clayton, C. E., Corde, S., Doche, A., Frederico, J., Gessner, S. J., Green, S. Z., Hogan, M. J., Joshi, C., Litos, M., Lu, W., Marsh, K. A., Mori, W. B., O’Shea, B. D., Vafaei-Najafabadi, N., & Yakimenko, V.. Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator. United States. https://doi.org/10.1103/PhysRevLett.120.124802
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Lindstrøm, C. A., Adli, E., Allen, J. M., An, W., Beekman, C., Clarke, C. I., Clayton, C. E., Corde, S., Doche, A., Frederico, J., Gessner, S. J., Green, S. Z., Hogan, M. J., Joshi, C., Litos, M., Lu, W., Marsh, K. A., Mori, W. B., O’Shea, B. D., Vafaei-Najafabadi, N., and Yakimenko, V.. Fri . "Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator". United States. https://doi.org/10.1103/PhysRevLett.120.124802.
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@article{osti_1429140,
title = {Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator},
author = {Lindstrøm, C. A. and Adli, E. and Allen, J. M. and An, W. and Beekman, C. and Clarke, C. I. and Clayton, C. E. and Corde, S. and Doche, A. and Frederico, J. and Gessner, S. J. and Green, S. Z. and Hogan, M. J. and Joshi, C. and Litos, M. and Lu, W. and Marsh, K. A. and Mori, W. B. and O’Shea, B. D. and Vafaei-Najafabadi, N. and Yakimenko, V.},
abstractNote = {Hollow channel plasma wakefield acceleration is a proposed method to provide high acceleration gradients for electrons and positrons alike: a key to future lepton colliders. However, beams which are misaligned from the channel axis induce strong transverse wakefields, deflecting beams and reducing the collider luminosity. This undesirable consequence sets a tight constraint on the alignment accuracy of the beam propagating through the channel. Direct measurements of beam misalignment-induced transverse wakefields are therefore essential for designing mitigation strategies. We present the first quantitative measurements of transverse wakefields in a hollow plasma channel, induced by an off-axis 20 GeV positron bunch, and measured with another 20 GeV lower charge trailing positron probe bunch. Furthermore, the measurements are largely consistent with theory.},
doi = {10.1103/PhysRevLett.120.124802},
journal = {Physical Review Letters},
number = 12,
volume = 120,
place = {United States},
year = {2018},
month = {3}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.120.124802
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Citation Metrics:
Cited by: 23 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Experimental setup: Two positron bunches first pass an electro-optical sampler (EOS). A Ti:Sapphire laser focused with a kinoform into a lithium vapor oven produces the hollow plasma channel. Two beam position monitors (BPM) measure the trajectory of the beam and an yttrium aluminum garnet (YAG) screen ismore » used to measure the transverse profile (b). A dipole spectrometer with two quadrupoles focuses the beam onto a LANEX screen for energy and angular deflection measurements (c) before it is dumped. Meanwhile, the outgoing laser pulse is focused onto cameras imaging the kinoform profile (d) at different object planes inside the channel, which appears asymmetric due to aberrations induced by the transmissive optics. The upstream spectrometer does not appear in this figure.« less
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Works referenced in this record:

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    Plasma-based accelerators: then and now
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