IPAC2013 - List of Authors (Reimann, O.)

Paper	Title	Page
TUPEA008	Physics of the AWAKE Project	1179
	P. Muggli, E. Oz, R. Tarkeshian MPI, Muenchen, Germany C. Bracco, E. Gschwendtner, A. Pardons CERN, Geneva, Switzerland A. Caldwell, O. Reimann MPI-P, München, Germany K.V. Lotov BINP SB RAS, Novosibirsk, Russia A.M. Pukhov HHUD, Dusseldorf, Germany J. Vieira IPFN, Lisbon, Portugal M. Wing UCL, London, United Kingdom
	The goal of the AWKAKE collaboration is the study of plasma wakefields driven by proton (p⁺) bunches through experiments, simulations and theory. Proton bunches are interesting wakefield drivers because they can be ultra-relativistic (TeVs/p⁺) and carry large amounts of energy (>kJ). It was demonstrated in simulations* that acceleration of an electron (e-) bunch from 10GeV to >500GeV can be achieved in ~500m of plasma driven by a 1TeV, 100micron-long, bunch with 10¹¹ p+. Such short p⁺ bunches do not exist today. It was suggested** that a p⁺ bunch long compared to the plasma period can transversely self-modulate and resonantly drive wakefields to large amplitudes (~GV/m). Initial experiments based on self-modulation instability (SMI) will use single 12cm-long CERN SPS bunches with 1-3·10¹¹, 450GeV p⁺ to study physics of SMI. With a plasma density of 7·10¹⁴/cc the plasma wave and modulation period is 1.3mm. The SMI saturates after ~3m with amplitude in the GV/m range. Later a low energy (~10MeV) witness e^- bunch will be injected at the SMI saturation point. Energy gain over ~7m of plasma can reach the GeV level. Translation from physics to experimental plan and setup will be presented. * A. Caldwell et al., Nature Physics 5, 363 (2009) ** N. Kumar et al., Phys. Rev. Lett. 104, 255003 (2010)

TUPEA045	Self-Modulation and Hosing Instability of Slac Electron and Positron Bunches in Plasmas	1235
	J. Vieira, N.C. Lopes Instituto Superior Tecnico, Lisbon, Portugal E. Adli, S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos SLAC, Menlo Park, California, USA Y. Fang USC, Los Angeles, California, USA C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi UCLA, Los Angeles, California, USA P. Muggli MPI, Muenchen, Germany O. Reimann MPI-P, München, Germany L.O. Silva IPFN, Lisbon, Portugal
	Funding: This work has been partially supported by Humboldt Foundation. The understanding of the self-modulation (SMI) and hosing (HI) instabilities is critical for the success of the upcoming proton driven plasma wakefield acceleration experiments at CERN. The use of long SLAC electron and positron bunches provides the possibility of understanding experimentally the interplay between SMI and HI. In this work we perform particle-in-cell simulations with the code OSIRIS with parameters that will be available for experiments at SLAC in 2013. We show that the SMI of 20 GeV lepton bunches can grow and saturate in less than 15 cm. Up to 8 GeV energy gain/loss could be observed after a meter long plasma. The HI can also be effectively mitigated by seeding the SMI using bunches with short rise times. We also show analytically and numerically that in the linear regime and after saturation of the SMI the HI can be suppressed by a plasma-BNS damping analogue. Several diagnostics that could be used in experiments to measure the SMI development and these effects are also explored. G. Xia et al., J. Plasma Phys., 1-7 (2012). **J. Vieira et al., Phys. Plasmas 19, 063105 (2012).

Paper

Title

Page

Physics of the AWAKE Project

1179

P. Muggli, E. Oz, R. Tarkeshian
MPI, Muenchen, Germany
C. Bracco, E. Gschwendtner, A. Pardons
CERN, Geneva, Switzerland
A. Caldwell, O. Reimann
MPI-P, München, Germany
K.V. Lotov
BINP SB RAS, Novosibirsk, Russia
A.M. Pukhov
HHUD, Dusseldorf, Germany
J. Vieira
IPFN, Lisbon, Portugal
M. Wing
UCL, London, United Kingdom

The goal of the AWKAKE collaboration is the study of plasma wakefields driven by proton (p⁺) bunches through experiments, simulations and theory. Proton bunches are interesting wakefield drivers because they can be ultra-relativistic (TeVs/p⁺) and carry large amounts of energy (>kJ). It was demonstrated in simulations* that acceleration of an electron (e-) bunch from 10GeV to >500GeV can be achieved in ~500m of plasma driven by a 1TeV, 100micron-long, bunch with 10¹¹ p+. Such short p⁺ bunches do not exist today. It was suggested** that a p⁺ bunch long compared to the plasma period can transversely self-modulate and resonantly drive wakefields to large amplitudes (~GV/m). Initial experiments based on self-modulation instability (SMI) will use single 12cm-long CERN SPS bunches with 1-3·10¹¹, 450GeV p⁺ to study physics of SMI. With a plasma density of 7·10¹⁴/cc the plasma wave and modulation period is 1.3mm. The SMI saturates after ~3m with amplitude in the GV/m range. Later a low energy (~10MeV) witness e^- bunch will be injected at the SMI saturation point. Energy gain over ~7m of plasma can reach the GeV level. Translation from physics to experimental plan and setup will be presented.
* A. Caldwell et al., Nature Physics 5, 363 (2009)
** N. Kumar et al., Phys. Rev. Lett. 104, 255003 (2010)

TUPEA045

Self-Modulation and Hosing Instability of Slac Electron and Positron Bunches in Plasmas

1235

J. Vieira, N.C. Lopes
Instituto Superior Tecnico, Lisbon, Portugal
E. Adli, S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos
SLAC, Menlo Park, California, USA
Y. Fang
USC, Los Angeles, California, USA
C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
UCLA, Los Angeles, California, USA
P. Muggli
MPI, Muenchen, Germany
O. Reimann
MPI-P, München, Germany
L.O. Silva
IPFN, Lisbon, Portugal

Funding: This work has been partially supported by Humboldt Foundation.
The understanding of the self-modulation (SMI) and hosing (HI) instabilities is critical for the success of the upcoming proton driven plasma wakefield acceleration experiments at CERN*. The use of long SLAC electron and positron bunches provides the possibility of understanding experimentally the interplay between SMI and HI. In this work we perform particle-in-cell simulations with the code OSIRIS with parameters that will be available for experiments at SLAC in 2013. We show that the SMI of 20 GeV lepton bunches can grow and saturate in less than 15 cm. Up to 8 GeV energy gain/loss could be observed after a meter long plasma. The HI can also be effectively mitigated by seeding the SMI using bunches with short rise times**. We also show analytically and numerically that in the linear regime and after saturation of the SMI the HI can be suppressed by a plasma-BNS damping analogue. Several diagnostics that could be used in experiments to measure the SMI development and these effects are also explored.
*G. Xia et al., J. Plasma Phys., 1-7 (2012).
**J. Vieira et al., Phys. Plasmas 19, 063105 (2012).