Optimal positron-beam excited wakefields in hollow and ion-wake channels
File(s)
Published version
Author(s)
Sahai, AA
Katsouleas, TC
Type
Conference Paper
Abstract
A positron-beam interacting with the plasma electrons drives radial suck-in, in contrast to an electron-beam driven blow-out in the over-dense regime, nb>
n0. In a homogeneous plasma, the electrons are radially sucked-in from all the different radii. The electrons collapsing from different radii do not simultaneously compress on-axis driving weak fields. A hollow-channel allows electrons
from its channel-radius to collapse simultaneously exciting coherent fields [1]. We analyze the optimal channel radius. Additionally, the low ion density in the hollow allows a larger region with focusing phase which we show is linearly focusing. We have shown the formation of an ion-wake channel
behind a blow-out electron bubble-wake. Here we explore positron acceleration in the over-dense regime comparing an optimal hollow-plasma channel to the ion-wake channel [2]. The condition for optimal hollow-channel radius is also compared. We also address the effects of a non-ideal ion-wake
channel on positron-beam excited field.
n0. In a homogeneous plasma, the electrons are radially sucked-in from all the different radii. The electrons collapsing from different radii do not simultaneously compress on-axis driving weak fields. A hollow-channel allows electrons
from its channel-radius to collapse simultaneously exciting coherent fields [1]. We analyze the optimal channel radius. Additionally, the low ion density in the hollow allows a larger region with focusing phase which we show is linearly focusing. We have shown the formation of an ion-wake channel
behind a blow-out electron bubble-wake. Here we explore positron acceleration in the over-dense regime comparing an optimal hollow-plasma channel to the ion-wake channel [2]. The condition for optimal hollow-channel radius is also compared. We also address the effects of a non-ideal ion-wake
channel on positron-beam excited field.
Date Issued
2015-05-03
Date Acceptance
2015-05-04
Citation
Proceedings of IPAC 2015
ISBN
978-3-95450-168-7
Journal / Book Title
Proceedings of IPAC 2015
Copyright Statement
© 2015 The Authors, distributed under the Creative Commons Attribution 3.0
License URL
Identifier
http://arxiv.org/abs/1512.08013
Source
International Particle Accelerator Conference 2015
Publication Status
Published
Start Date
2015-05-03
Finish Date
2015-05-08
Coverage Spatial
Richmond, Virginia, USA