“Putting Beam Physics at the Forefront of Science”
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Transcript of “Putting Beam Physics at the Forefront of Science”
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“Putting Beam Physics at the Forefront of Science”Work supported by DOE
Beam-Driven Plasma Based Advanced Acceleration Concepts
C.Joshi UCLA
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IN HONOR OFProfessor Ron Davidson’s 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 inHigh Energy Density PhysicsPrepared for OSTP byNational Task Force on High Energy Density Physics.
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TASK FORCE WORKING GROUPS
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
HEDP Task ForceChair:Davidson,Co-Chair:Katsouleas
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Plasma Wakefield Plasma Wakefield AcceleratorsAccelerators(Blowout Regime)
• Plasma ion channel exerts restoring force => space charge oscillations
•Linear focusing force on beams (F/r=2ne2/m)
Accelerating Field 100 GeV/m , Focusing Gradients MT/m
• Space charge/ponderomotive force of thee beam/laser pulse displaces plasma electrons
Rosenzweig et. 1990 Pukhov and Meyer-te-vehn 2002 (Bubble)
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EzEz
drive beam
UCLA,USC,SLAC,ANL,FNAL,KEK,BNL
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UCLA
ILC
Plasma Accelerator Progress“Accelerator Moore’s Law”
Working MachinesDoing physics
Max.Energy inLaser Experiments
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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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Located in the FFTB
FFTB
e-
N=1-2· 1010
σz=0.1 mm=30 E GeV
Ionizing Laser Pulse
(193 )nm Li Plasma
ne≈6 · 10 15 cm-3
L≈30 cm
CerenkovRadiator
Streak Camera(1 )ps resolution
-X RayDiagnostic
Optical TransitionRadiators Dump
25 m
∫Cdt
!Not to scale
Spectrometer
25 m
Beam-Driven PWFA@ SLAC
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BREAKING THE 1 GeV BARRIERWith 15 micron long bunches
0
2 104
4 104
6 104
8 104
1 105
1.2 105
-6 -4 -2 0 2
%CSpectra2.55e17
Plasma ONPlasma ONPlasma ONPlasma ONPlasma OFF
Relative Energy (GeV)
ne≈3.51017 cm-3 L≈10 cm, N≈ 1.81010
Charge Fraction at E>0: 8% of total charge!
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ENERGY GAIN SCALING with PLASMA LENGTH
14GeV Energy Gain in less than 30cm !
U C L A
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Some electrons double their energy in 84cm!Some electrons double their energy in 84cm!
U C L A
Linac running all out to deliver compressed 42GeV Electron Bunches to the plasmaRecord Energy GainHighest Energy Electrons Ever Produced @ SLACSignificant Advance in Demonstrating Potential of Plasma Accelerators
Nature vol 445,p741 (2007)
E-167: Energy Doubling with aPlasma Wakefield Accelerator in the FFTB
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RAL
LBL Osaka
UCLA
E164X
ILC
Plasma Accelerator Progress“Accelerator Moore’s Law”
E167
LBNL
Working MachinesDoing physics
Max.Energy inPlasma Experiments
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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.
To address critical issues for realizing a plasma-based accelerator at the energy frontier in the next decade.
New Compelling QuestionPlasma Afterburner for a conventional linear collider?
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Plasma Afterburner for Linear Collider
Drive Beams Excite Ultrahigh-GradientAccelerating Structures in Plasmas
Trailing Beams Extract EnergyFrom 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 R&D 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