“putting beam physics at the forefront of science”
DESCRIPTION
Beam-Driven Plasma Based Advanced Acceleration Concepts C.Joshi UCLA. “Putting Beam Physics at the Forefront of Science”. Work supported by DOE. IN HONOR OF Professor Ron Davidson’s Leadership Role in HEDS What are the compelling questions? Frontiers in High Energy Density Physics- - PowerPoint PPT PresentationTRANSCRIPT
“Putting Beam Physics at the Forefront of Science”Work supported by DOE
Beam-Driven Plasma Based Advanced Acceleration Concepts
C.Joshi UCLA
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.
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
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
UCLA
ILC
Plasma Accelerator Progress“Accelerator Moore’s Law”
Working MachinesDoing physics
Max.Energy inLaser Experiments
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?
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
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!
ENERGY GAIN SCALING with PLASMA LENGTH
14GeV Energy Gain in less than 30cm !
U C L A
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
RAL
LBL Osaka
UCLA
E164X
ILC
Plasma Accelerator Progress“Accelerator Moore’s Law”
E167
LBNL
Working MachinesDoing physics
Max.Energy inPlasma Experiments
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?
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
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
Thanks Ron!!!
Keep asking us
What are the compelling Questions?
With very best wishes from
Plasma-Accelerators Community