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Beam-Driven Plasma Based Advanced Acceleration
Concepts C.Joshi UCLA
Putting Beam Physics at the Forefront of Science
Work supported by DOE
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IN HONOR OF Professor Ron Davidsons Leadership
Role in HEDS What are the compelling
questions? Frontiers in High Energy Density
Physics- The X-Games of Contemporary Science (NRC
Press 2003) Frontiers for Discovery in High
Energy Density Physics Prepared for OSTP
by National Task Force on High Energy Density
Physics.
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TASK FORCE WORKING GROUPS
ChairDavidson,Co-ChairKatsouleas
HEDP Task Force
A - HEDP in Astrophysical Systems Rosner
(Chair), Arons, Baring, Lamb, Stone B -
Beam-Induced HEDP (RHIC, heavy ion fusion,
high-intensity accelerators, etc.) Joshi
(Chair), Jacak, Logan, Mellisinos, Zajc S - HEDP
in Stockpile Stewardship Facilities (Omega, Z,
National Ignition Facility, etc.) Remington
(Chair), Deeney, Hammer, Lee, Meyerhofer,
Schneider, Silvera, Wilde U - Ultrafast,
Ultraintense Laser Science Ditmire
(Chair), DiMauro, Falcone, Hill, Mori, Murnane
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Plasma Wakefield Accelerators (Blowout Regime)
Rosenzweig et. 1990 Pukhov and
Meyer-te-vehn 2002 (Bubble)

• Space charge/ponderomotive force of thee
  beam/laser pulse displaces plasma electrons

• Plasma ion channel exerts restoring force gt
  space charge oscillations
• Linear focusing force on beams (F/r2pne2/m)
• Accelerating Field 100 GeV/m , Focusing Gradients
  MT/m

UCLA,USC,SLAC,ANL,FNAL,KEK,BNL
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Plasma Accelerator Progress Accelerator Moores
Law
ILC
Working Machines Doing physics
Max.Energy in Laser Experiments
UCLA
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High Energy Density Science with
Ultra-relativistic Electron Beams Compelling
Question Can the ultra high electric fields
in a beam-driven plasma wakefield be harnessed
and sufficiently controlled to accelerate and
focus high-quality, high-energy beams in compact
devices?
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Beam-Driven PWFA_at_ SLAC
Located in the FFTB
25 m
FFTB
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BREAKING THE 1 GeV BARRIER With 15 micron long
bunches
ne3.5?1017 cm-3 L10 cm, N 1.8?1010
Charge Fraction at Egt0 8 of total charge!
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ENERGY GAIN SCALING with PLASMA LENGTH 14GeV
Energy Gain in less than 30cm !
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E-167 Energy Doubling with aPlasma Wakefield
Accelerator in the FFTB
Linac running all out to deliver compressed 42GeV
Electron Bunches to the plasma Record Energy
Gain Highest Energy Electrons Ever Produced _at_
SLAC Significant Advance in Demonstrating
Potential of Plasma Accelerators
Nature vol 445,p741 (2007)
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Plasma Accelerator Progress Accelerator Moores
Law
ILC
Working Machines Doing physics
E167
E164X
LBNL
RAL
LBL Osaka
Max.Energy in Plasma Experiments
UCLA
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Goals and Relevance
To address critical issues for realizing a
plasma-based accelerator at the energy frontier
in the next decade.
New Compelling Question Plasma Afterburner for a
conventional linear collider?
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Plasma Afterburner for Linear Collider
Drive Beams Excite Ultrahigh-Gradient Accelerating
Structures in Plasmas
Trailing Beams Extract Energy From These
Structures
C.Joshi and T.Katsouleas Physics Today June 2003
p47
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Conclusion
Marx HEPAP subpanel The challenge is to
undertake and sustain the difficult and complex
RD needed to enable a feasible,cost and energy
effective technology on the several decade
horizon.Achieving these goals will require
creativity and the development and maturation of
new accelerator approaches and technologies.
C.J. T.K. thank their colleagues on experiments
E164X and E167
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Thanks Ron!!! Keep asking us What are the
compelling Questions? With very best wishes
from Plasma-Accelerators Community