first observation of self-modulation instability seeding at atf
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First Observation of Self-Modulation Instability Seeding at ATF. Yun Fang University of Southern California, Los Angeles, 90089 Patric Muggli Max Planck Institute for Physics, Munich, Germany Warren Mori University of California, Los Angeles, 90095 - PowerPoint PPT PresentationTRANSCRIPT
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First Observation of Self-Modulation Instability Seeding at ATFYun FangUniversity of Southern California, Los Angeles, 90089
Patric MuggliMax Planck Institute for Physics, Munich, Germany
Warren MoriUniversity of California, Los Angeles, 90095
V. Yakimenko, M. Fedurin, K. Kusche, M. Babzien, C. Swinson, R. MaloneBrookhaven National Laboratory, Upton, NY 11973
Work supported by US Dept. of Energy
OUTLINEIntroduction of Self-Modulation Instability (SMI)
Investigation of the beam charge through simulation to study energy modulation with the available electron bunch at ATF
Experimental observation of periodic energy modulation in various plasma densities
Seeding of SMI through energy modulation
Study of instability seeding effect involved in the experiment
Proton Bunches produced at LHC will have up to 7TeV/particle, 100 kJ/bunch, much higher than the current lepton bunches (60J/bunch, 100GeV/particle) can be used as the drive bunch in PWFA ?A.Caldwell proposed the idea of of proton-driven PWFA and demonstrated the possibility of producing a TeV electron bunch in a single acceleration stage using a short (~100um) proton bunch driver. (A. Caldwell et al., Nature Physics 5, 363 (2009); B. E. Blues thesis (2003))However, such short proton bunches are not available (~12cm). Kumar et al. suggested that self-modulation could radially modulate a long bunch into small beamlets on the scale of pe, resulting in the resonant excitation of large amplitude accelerating wakefields.SMI is interesting beam-plasma interaction physics Take advantage of electron bunches and experimental infrastructure available at SLAC and BNL-ATF to study the physics of SMI. Motivation of Studying SMI
osiris framework
Massivelly Parallel, Fully Relativistic Particle-in-Cell (PIC) Code New Hybrid algorithmVisualization and Data Analysis InfrastructureDeveloped by the osiris.consortium UCLA + IST
Ricardo Fonseca: [email protected] Tsung: [email protected]://cfp.ist.utl.pt/golp/epp/ http://plasmasim.physics.ucla.edu/OSIRIS 2.0
New Features in v2.0
High-order splinesBinary Collision ModuleHybrid codeBoosted framePML absorbing BCVector processor optimization (SSE)Energy and momentum conserving field interpolationHigher order and dispersion free solversOpenMP/MPI hybrid3D Dynamic Load BalancingParallel I/OSelf Modulation Instability (SMI)
04-4
1-1
10-401.53Focusing Field (MV/m)Ez (MV/m)0
20-20
4-4
10-31.53 Demonstrated by simulation, by never by experiments yet!No diagnostics to measure directly the radial modulationEnergy modulation is measurable, and is the seed for radial modulation
z=0 cmz=13.5 cmSMIResonant Excitation!Growth (z)Growth ()Lbeam/ pe=45ATF Beam Parameters & Simulation Parameters Electron BunchLbeam :: 960um (Square)r :: 120umE :: 58.3MeVE :: 0.481MeV (correlated)N :: 13mm-mrad Q :: 50pC / 1nC
Low Energy
57.858.858.3Energy (MeV)FrontBack