Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JP11: Poster Session IV: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
BEAMS: Laser Accelerators
Education, Public Engagement, and DEI
High School and Undergraduate Research
2:00 PM - 5:00 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: JP11.00015 : Self-consistent simulations of a PWFA linear collider stage with witness beam realignment using adiabatic ramps*
Presenter:
Lance Hildebrand
(University of California, Los Angeles)
Authors:
Lance Hildebrand
(University of California, Los Angeles)
Yujian Zhao
(University of California, Los Angeles)
Weiming An
(Beijing Normal Univ)
Fei Li
(University of California, Los Angeles)
Xinlu Xu
(SLAC - Natl Accelerator Lab)
Warren B Mori
(University of California, Los Angeles)
Chandrashekhar Joshi
(University of California, Los Angeles)
future linear colliders. Recent progress has shown PWFA can acheieve high acceleration gradients
with high energy transfer efficiency while maintaining low energy spread. In the regime relevant
for linear colliders, the witness beam emittance is ~100 nm and the charge is ~1 nC. With these
parameters, the ion collapse will be drastic and lead to emittance growth, however An et al. (2017)
[1] showed this emittance growth is controllable. Mehrling et al. (2018) [2] showed hosing of the
witness beam is suppressed in this regime due to the BNS mechanism. Hildebrand et al. (2018) [3]
showed that the on-axis ion column formed by a high density drive beam can fully eliminate the
witness beam hosing and realign it with the drive beam. We will show that using density ramps
can help match the beam with the presence of ion motion and realign an oset witness beam. We
will explore the emittance growth of the witness beam using fully self-consistent PIC simulations
using the code QPAD and analytical models.
[1] An et al.,"Ion motion induced emittance growth of matched electron beams in plasma wake-
fields", PRL 118 (2017)
[2] Mehrling et al., "Suppression of beam hosing in plasma accelerators with ion motion", PRL 121
(2018)
[3] Hildebrand et al., "Mitigation techniques of witness beam hosing in plasma-based acceleration",
Proceedings of the Advanced Accelerator Conference, Breckenridge, CO (2018)
*Work supported by DOE HEP grant DE-SC0010064, DOE SciDAC program through a FNALsubcontract 644405, and NSF award 1806046.
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