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Proton-driven plasma wakefield acceleration in hollow plasma

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Presentation on theme: "Proton-driven plasma wakefield acceleration in hollow plasma"— Presentation transcript:

1 Proton-driven plasma wakefield acceleration in hollow plasma
Yangmei Li Supervisor: Guoxing Xia 2016/12/13 Christmas meeting

2 Beam driven plasma wakefield acceleration
Positively charged driver Uniform plasma r z r z Electron driven: strong, radially linear focusing Positron/Proton driven: radially nonlinear and longitudinally varying focusing force 2016/12/13 Christmas meeting

3 0.62 TeV e- beam energy frontier! SPS (450 GeV, 1.3e11 p/bunch) ~ 10 kJ LHC (7 TeV, 1.15e11 p/bunch) ~ 140 kJ SLAC (50 GeV, 2e10 e/bunch) ~ 0.16 kJ ILC (250 GeV, 2e10 e/bunch) ~ 0.8kJ CLARA (250 MeV, 1.56e9 e-/bunch ) ~0.06 Proton-driven plasma-wakefiled acceleration. A. Caldwell et al., Nature Phys. 5, 363 (2009). 2016/12/13 Christmas meeting

4 The concept Hollow plasma channel for electron acceleration
Create a regime completely without transverse plasma wakefields Conservation of the norm. emittance of the witness beam Electron bunch Proton bunch rc r x=z-ct plasma electron density distribution 2016/12/13 Christmas meeting

5 Parameters for simulation
Quasi-static PIC code: LCODE[1] As there is no plasma focusing in the channel, quadrupoles now guide both the driver and the witness bunch. [1] Lotov, K. Phys. Rev. ST Accel. Beams 6, (2003). Plasma density, np Hollow radius, rc Quadrupole period, Lq Quadrupole strength, S 51014 cm-3 0.35 mm 0.9m 500T/m Population, Np Energy, W Energy spread, δW/W Bunch length, σz Beam radius, σr Proton bunch 1.151011 1 TeV 10% 150 μm 350 μm Electron bunch 1.01010 10 GeV 1% 15 μm 10 μm 2016/12/13 Christmas meeting

6 Simulation results Radial variations of the transverse fields
on-axis acc field Radial variations of the transverse fields 2D transverse plasma fields 0.62 TeV 4.6% Mean energy and energy spread of the WB 2016/12/13 Christmas meeting

7 Normalized emittance Evolution of the transverse field at the midplane of the WB Initial value: 2.0 mm mrad 2.4 mm mrad Norm. emittance of the WB within 3σr 2016/12/13 Christmas meeting

8 Betatron radiation Tracking particles initially at four different radii 2016/12/13 Christmas meeting

9 Beam loading effect Significantly mitigated beam loading effect
Well-preserved norm. emmitance Reduce energy spread via extension of the bunch length or tailoring the bunch shape On-axis fields loaded with different charges of WB below 2.5 mm mrad Mean energy and energy spread for different loaded witness beams Norm. emittance of the WB within 3σr for different loaded witness beams 2016/12/13 Christmas meeting

10 Merry Christmas and Happy New Year!
2016/12/13 Christmas meeting

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