Chengkun Huang | Compass meeting 2008 Chengkun Huang, I. Blumenfeld, C. E. Clayton, F.-J. Decker, M. J. Hogan, R. Ischebeck, R. Iverson, C. Joshi, T. Katsouleas,

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Presentation transcript:

Chengkun Huang | Compass meeting 2008 Chengkun Huang, I. Blumenfeld, C. E. Clayton, F.-J. Decker, M. J. Hogan, R. Ischebeck, R. Iverson, C. Joshi, T. Katsouleas, N. Kirby, W. Lu, K. A. Mash, W. B. Mori, P. Muggli, E. Oz, R. H. Siemann, D. Waltz, M. M. Zhou Challenges and results on modeling pwfa: current experiments and a collider

Chengkun Huang | Compass meeting Plasma Wakefield Acceleration Accelerating force Uniform accelerating field Linear focusing field Focusing force FrFr FzFzFzFz Blow-out regime

Chengkun Huang | Compass meeting 2008 Energy doubler The Energy Doubling Experiment Particles, not beam yet! Next step: demonstrate high quality beam acceleration Blumenfeld et. al. Nature (2007)

Chengkun Huang | Compass meeting 2008 PWFA-based collider concept a 19 Stages PWFA-LC with 25GeV energy gain per stage A few 10s nm beam size and emittance

Chengkun Huang | Compass meeting 2008 F acilities for AC celerator science and E xperimental T est Beams FACET is a new facility to provide high-energy, high peak current e - & e + beams for PWFA experiments at SLAC

Chengkun Huang | Compass meeting 2008 PWFA FACET

Chengkun Huang | Compass meeting 2008 Simulation needs Meter long plasma + highly relativistic beam, there is clear separation of time scales, well suited for reduced PIC code. 3D effects such as hosing and asymmetric beam sizes are important, 3D simulation model required. Spotsizes are extremely tight for a electron positron collider, the transverse resolution has to be extremely high which means very strict time step requirement for a full PIC model. For example, beam size in next linear collider is 600x6 nm^2, simulation box size is 200x200 micron^2, needs 600x60000x500 grids, time step < 0.7 fs, # of time step ~ 1E7 for one 25 GeV stage. Quisa-static PIC model appears to be a good choice for modeling PWFA-LC.

Chengkun Huang | Compass meeting 2008 Quasi-static PIC code QuickPIC 3D Quasi-static model + Ponderomotive guiding center + envelope model + ADK model Can be 100+ times faster than conventional PIC with good accuracy Examples of applications Simulations for PWFA experiments, E157/162/164/164X/167 (Including Feb Nature) Study of electron cloud effect in LHC. Plasma afterburner design up to TeV Beam loading study using laser/beam drivers Development institutions UCLA, IST and U. Maryland The driver evolution can be calculated in a 3D moving box, while the plasma response can be solved for slice by slice with the longitudinal index being a time-like variable. Quasi-static model

Chengkun Huang | Compass meeting beams generation in FACET

Chengkun Huang | Compass meeting 2008 Simulation of proposed FACET experiment

Chengkun Huang | Compass meeting 2008 PWFA-LC design exercise Focus on first/last PWFA stage Use theoretical framework to guide our designs Explore design options Test design with simulation Not an optimized or final design

Chengkun Huang | Compass meeting 2008 Why nonlinear physics is important ?

Chengkun Huang | Compass meeting 2008 Basic parameters L W EzEz In the blow-out regime: Practical parameters: Beam : ~1E10 e - Plasma : 1E14 cm -3 ~ 1E18 cm -3 (Ez = 1~100 GeV/m) To blow-out (W/2=1~3), bunch length 3 ~ 30 micron

Chengkun Huang | Compass meeting 2008 Synchrotron radiation

Chengkun Huang | Compass meeting 2008 n p =1  cm -3 N driver = 2.9  10 10,  r = 3   z = 30 , Energy = 25 GeV N trailing = 1.0  10 10,  r = 3 ,  z = 10 , Energy = 25 GeV Spacing=110  R trans = -E acc /E dec > 1 (Energy gain exceeds 25 GeV per stage) 1% Energy spread Efficiency from drive to trailing bunch ~48%! Nominal 25 GeV Preionized PWFA stage

Chengkun Huang | Compass meeting 2008 Beam profile design To achieve the smallest energy spread of the beam, we want the beam-loaded wake to be flat within the beam. Formulas for designing flat wakefield in blow-out regime (Lu et al., PRL 2006; Tzoufras et al, PRL 2008 ): We know when r b =r b,max, E z =0, dE z /dξ=-1/2. Integrating E z from this point in +/-  using the desirable E z profile yield the beam profile. Ez rbrb For example, R b =5, E z,acc =-1,  =6.25-(  -  0 )

Chengkun Huang | Compass meeting 2008 PWFA-LC simulation setup Simulation of the first and the last stages of a 19 stages 0.5TeV PWFA Physical Parameters Numerical Parameters Drive beamTrailing beam Beam Charge (1E10e -) Beam Length (micron) Emittance (mm mrad)10 / Plasma density (1E16 cm -3 )5.66 Plasma Length (m)0.7 Transformer ratio1.2 Loaded wake (GeV/m)45 GeV/m Beam particle8.4 E6 x 3 Time step60 k p -1 Total step520 Box size1000x1000x272 Grids1024x1024x256 Plasma particle4 / cell

Chengkun Huang | Compass meeting 2008 Simulation of 25/475 GeV stages 475 GeV stage 25 GeV stage envelope oscillation Engery depletion; Adiabatic matching Hosing s = 0 m s = 0.23 m s = 0.47 ms = 0.7 m s = 0 m s = 0.23 m s = 0.47 ms = 0.7 m Matched propagation

Chengkun Huang | Compass meeting 2008 Simulation of 25/475 GeV stages s = 0 m s = 0.23 m s = 0.47 ms = 0.7 m Energy spread = 0.7% (FWHM) Energy spread = 0.2% (FWHM) longitudinal phasespace 25 GeV stage 475 GeV stage

Chengkun Huang | Compass meeting 2008 Simulation of 25/475 GeV stages Transverse phasespace 475 GeV stage 25 GeV stage

Chengkun Huang | Compass meeting 2008 Ion motion when Matched beam spot size shrinks at large , low  n For future collider  ny down by 10 2 (e.g., 10nm-rad)  up by n b up by Ion motion must be included in design/models Ref. S. Lee et al., AAC Proc (2000); J. Rosenzweig et al., PRL (2006) Ion motion

Chengkun Huang | Compass meeting 2008 Summary PWFA experiment has shown sustained acceleration of electrons over meter-long plasma. Quasi-static model enables full-scale simulations that reveal the underlying physics. Designing PWFA-LC for TeV collider scenario is challenging, we attempt to investigate the problem in an integrated approach, where relevant physics such as beam-loading, hosing, head erosion and radiation loss are taken as design constraints. Theoretical understanding of the blow-out regime and beam-loading makes it possible to reduce energy spread of the accelerated beam. Simulation of 2 beams PWFA experiment in the proposed FACET facility shows that high quality beam can be accelerated. Preliminary simulations are conducted to explore the possibility of a 19 stages PWFA-LC.