IPAC2014 - List of Authors (Mori, W.B.)

Paper	Title	Page
TUOBB03	Recent Progress on High Quality Electron Beam Generation through Plasma-based Acceleration at Tsinghua University
	W. Lu, Y.-C. Du, J.F. Hua, W.-H. Huang, F. Li, C.H. Pai, J. Shi, C.-X. Tang, Y. Wan, Y.P. Wu, X.L. Xu, L.X. Yan, C.J. Zhang TUB, Beijing, People's Republic of China C. Joshi, W.B. Mori UCLA, Los Angeles, California, USA
	Recent progress of plasma based acceleration at Tsinghua University will be presented. On the theory and simulation part, several ideas on how to obtain high quality electron beams with extremely high brightness through wakefield acceleration will be discussed in details, including two recently published works based on ionization injection method(PRL 111, 015003, 2013; PRL 112, 035003, 2014); On the experiment part, our recent results of high quality 20-30MeV electron beams with very low energy spread, with minimal absolute energy spread of 0.18MeV RMS and relative energy spread 0.8% RMS, will be presented.
	Slides TUOBB03 [11.000 MB]
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TUPME049	Hosing Suppression in the Self-modulated Wakefield Accelerator	1473
	J. Vieira IPFN, Lisbon, Portugal W.B. Mori UCLA, Los Angeles, California, USA P. Muggli MPI, Muenchen, Germany
	Funding: FCT-Portugal contract no EXPL/FIS-PLA/0834/1012; European Research Council contract no ERC-2010-AdG Grant 267841; by DOE contract no DE-SC0008491, DE-SC0008316, and DE-FG02- 92-ER40727. The proton driven plasma wakefield accelerator (PDPWFA) uses short LHC proton (p⁺) bunches (shorter than the plasma wavelength) as drivers for strongly non-linear plasma waves. Simulations showed that the PDPWFA could be used to accelerate electrons to 600 GeVs in 600 m long plasmas. Currently available p⁺ bunches are much longer than the plasma wavelength, being ideal to excite intese wakefields through the self-modulation instability (SMI). An experiment is being prepared at CERN to demonstrate SMI of p⁺ bunches. In addition, lepton SMI experiments are also being prepared at SLAC, DESY-PITZ and RAL. The hosing instability (HI) is a competing instability that may lead to beam breakup, and needs to be controlled over the long propagation distances required for SMI growth and saturation. In this work we show that the HI can be suppressed after SMI saturation in the linear wakefield excitation regime. SMI saturation before beam-break up can be achieved by seeding SMI, and as long as the initial bunch centroid displacements are within the initial bunch transverse size. The HI suppression occurs via a plasma analogue of the BNS damping in conventional accelerators. A. Caldwell et al, Nat. Physics Nat. Phys. 5, 363 (2009).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME049
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TUPME050	Electron Bunch Self-modulation in Long Plasmas at SLAC FACET	1476
	P. Muggli MPI, Muenchen, Germany E. Adli, V.K.B. Olsen University of Oslo, Oslo, Norway L.D. Amorim IST, Lisboa, Portugal S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos SLAC, Menlo Park, California, USA C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi UCLA, Los Angeles, California, USA N.C. Lopes, J. Vieira Instituto Superior Tecnico, Lisbon, Portugal O. Reimann MPI-P, München, Germany
	Funding: This work performed in part under DOE Contract DE-AC02-76SF00515. We study the physics of self-modulation instability (SMI) of long, when compared to the wake wavelength, electron and positron bunches in pre-formed plasmas at SLAC-FACET. Self-modulation is the result of the action of focusing/defocusing transverse wakefields on the bunch radius. Self-modulation leads to observables such as overall defocusing of the bunch, periodic modulation of the bunch radius at the wake period and multi-GeV energy gain/loss by drive bunch particles. Defocusing is observed from OTR images, radial self-modulation from CTR spectra and interferometric traces and energy gain/loss from energy spectra with sub-GeV resolution. The plasma density is varied by changing the vapor density ionized by a laser/axicon system. The bunch length, radius and charge can also be varied. The SMI can be seeded using a notch collimator system. Numerical simulations indicate that seeding the SMI mitigates the hose instability. Hose instability can also be seeded, for example by using the RF deflecting cavity to impart a tilt to the incoming bunch axis. The overall experimental plan as well as the latest experimental results obtained with electron bunches will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME050
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THPRI013	A Beam Driven Plasma-wakefield Linear Collider from Higgs Factory to Multi-TeV	3791
	J.-P. Delahaye, E. Adli, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer SLAC, Menlo Park, California, USA W. An, C. Joshi, W.B. Mori UCLA, Los Angeles, California, USA
	An updated design of a beam-driven Plasma Wake-Field Acceleration Linear Collider (PWFA-LC) covering a wide range of beam collision energy from Higgs factory to multi-TeV is presented. The large effective accelerating field on the order of 1 GV/m and high wall-plug to beam power transfer efficiency of the beam driven plasma technology in a continuous operation mode allows to extend linear colliders to unprecedented beam collision energies up to 10 TeV with reasonable facility extension and power consumption. An attractive scheme of an ILC energy upgrade using the PWFA technology in a pulsed mode is discussed. The major critical issues and the R&D to address their feasibility in dedicated test facilities like FACET and FACET2 are outlined, especially the beam quality preservation during acceleration and the positron acceleration. Finally, a tentative scenario of a series of staged facilities with increasing complexity starting with short term application at low energy is developed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI013
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Paper

Title

Page

TUOBB03

Recent Progress on High Quality Electron Beam Generation through Plasma-based Acceleration at Tsinghua University

W. Lu, Y.-C. Du, J.F. Hua, W.-H. Huang, F. Li, C.H. Pai, J. Shi, C.-X. Tang, Y. Wan, Y.P. Wu, X.L. Xu, L.X. Yan, C.J. Zhang
TUB, Beijing, People's Republic of China
C. Joshi, W.B. Mori
UCLA, Los Angeles, California, USA

Recent progress of plasma based acceleration at Tsinghua University will be presented. On the theory and simulation part, several ideas on how to obtain high quality electron beams with extremely high brightness through wakefield acceleration will be discussed in details, including two recently published works based on ionization injection method(PRL 111, 015003, 2013; PRL 112, 035003, 2014); On the experiment part, our recent results of high quality 20-30MeV electron beams with very low energy spread, with minimal absolute energy spread of 0.18MeV RMS and relative energy spread 0.8% RMS, will be presented.

Slides TUOBB03 [11.000 MB]

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TUPME049

Hosing Suppression in the Self-modulated Wakefield Accelerator

1473

J. Vieira
IPFN, Lisbon, Portugal
W.B. Mori
UCLA, Los Angeles, California, USA
P. Muggli
MPI, Muenchen, Germany

Funding: FCT-Portugal contract no EXPL/FIS-PLA/0834/1012; European Research Council contract no ERC-2010-AdG Grant 267841; by DOE contract no DE-SC0008491, DE-SC0008316, and DE-FG02- 92-ER40727.
The proton driven plasma wakefield accelerator (PDPWFA) uses short LHC proton (p⁺) bunches (shorter than the plasma wavelength) as drivers for strongly non-linear plasma waves. Simulations showed that the PDPWFA could be used to accelerate electrons to 600 GeVs in 600 m long plasmas*. Currently available p⁺ bunches are much longer than the plasma wavelength, being ideal to excite intese wakefields through the self-modulation instability (SMI). An experiment is being prepared at CERN to demonstrate SMI of p⁺ bunches. In addition, lepton SMI experiments are also being prepared at SLAC, DESY-PITZ and RAL. The hosing instability (HI) is a competing instability that may lead to beam breakup, and needs to be controlled over the long propagation distances required for SMI growth and saturation. In this work we show that the HI can be suppressed after SMI saturation in the linear wakefield excitation regime. SMI saturation before beam-break up can be achieved by seeding SMI, and as long as the initial bunch centroid displacements are within the initial bunch transverse size. The HI suppression occurs via a plasma analogue of the BNS damping in conventional accelerators.
* A. Caldwell et al, Nat. Physics Nat. Phys. 5, 363 (2009).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME049

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TUPME050

Electron Bunch Self-modulation in Long Plasmas at SLAC FACET

1476

P. Muggli
MPI, Muenchen, Germany
E. Adli, V.K.B. Olsen
University of Oslo, Oslo, Norway
L.D. Amorim
IST, Lisboa, Portugal
S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos
SLAC, Menlo Park, California, USA
C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
UCLA, Los Angeles, California, USA
N.C. Lopes, J. Vieira
Instituto Superior Tecnico, Lisbon, Portugal
O. Reimann
MPI-P, München, Germany

Funding: This work performed in part under DOE Contract DE-AC02-76SF00515.
We study the physics of self-modulation instability (SMI) of long, when compared to the wake wavelength, electron and positron bunches in pre-formed plasmas at SLAC-FACET. Self-modulation is the result of the action of focusing/defocusing transverse wakefields on the bunch radius. Self-modulation leads to observables such as overall defocusing of the bunch, periodic modulation of the bunch radius at the wake period and multi-GeV energy gain/loss by drive bunch particles. Defocusing is observed from OTR images, radial self-modulation from CTR spectra and interferometric traces and energy gain/loss from energy spectra with sub-GeV resolution. The plasma density is varied by changing the vapor density ionized by a laser/axicon system. The bunch length, radius and charge can also be varied. The SMI can be seeded using a notch collimator system. Numerical simulations indicate that seeding the SMI mitigates the hose instability. Hose instability can also be seeded, for example by using the RF deflecting cavity to impart a tilt to the incoming bunch axis. The overall experimental plan as well as the latest experimental results obtained with electron bunches will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME050

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THPRI013

A Beam Driven Plasma-wakefield Linear Collider from Higgs Factory to Multi-TeV

3791

J.-P. Delahaye, E. Adli, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer
SLAC, Menlo Park, California, USA
W. An, C. Joshi, W.B. Mori
UCLA, Los Angeles, California, USA

An updated design of a beam-driven Plasma Wake-Field Acceleration Linear Collider (PWFA-LC) covering a wide range of beam collision energy from Higgs factory to multi-TeV is presented. The large effective accelerating field on the order of 1 GV/m and high wall-plug to beam power transfer efficiency of the beam driven plasma technology in a continuous operation mode allows to extend linear colliders to unprecedented beam collision energies up to 10 TeV with reasonable facility extension and power consumption. An attractive scheme of an ILC energy upgrade using the PWFA technology in a pulsed mode is discussed. The major critical issues and the R&D to address their feasibility in dedicated test facilities like FACET and FACET2 are outlined, especially the beam quality preservation during acceleration and the positron acceleration. Finally, a tentative scenario of a series of staged facilities with increasing complexity starting with short term application at low energy is developed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI013

Export •

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