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Update explanation of why 2D simulations are not suitable for plasma-wakefield #4544

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Update explanation of why 2D simulations are not suitable for plasma-wakefield #4544

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Update physics explanation
RemiLehe Dec 14, 2023
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RemiLehe Dec 19, 2023
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5 changes: 3 additions & 2 deletions Examples/Physics_applications/laser_acceleration/README.rst
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Expand Up @@ -5,8 +5,9 @@ Laser-Wakefield Acceleration of Electrons

This example shows how to model a laser-wakefield accelerator (LWFA) :cite:p:`ex-TajimaDawson1982,ex-Esarey1996`.

Laser-wakefield acceleration is best performed in 3D and quasi-cylindrical (RZ) geometry, which ensures that the plasma wavelength of the wakefield is modelled with the right scale lengths.
RZ modeling enables efficient modeling if effects of asymmetry shall be ignored (e.g., asymmetric beams and transverse profiles, hosing of the injected beam, etc.).
Laser-wakefield acceleration is best performed in 3D or quasi-cylindrical (RZ) geometry, in order to correctly capture some of the key physics (laser diffraction, beamloading, shape of the accelerating bubble in the blowout regime, etc.).
For physical situations that have close-to-cylindrical symmetry, simulations in RZ geometry capture the relevant physics at a fraction of the computational cost of a 3D simulation.
On the other hand, for physical situation with strong asymmetries (e.g., non-round laser driver, strong hosing of the accelerated beam, etc.), only 3D simulations are suitable.

For LWFA scenarios with long propagation lengths, use the :ref:`boosted frame method <theory-boostedframe>`.
An example can be seen in the :ref:`PWFA example <examples-pwfa>`.
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5 changes: 3 additions & 2 deletions Examples/Physics_applications/plasma_acceleration/README.rst
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Expand Up @@ -5,8 +5,9 @@ Beam-Driven Wakefield Acceleration of Electrons

This example shows how to model a beam-driven plasma-wakefield accelerator (PWFA) :cite:p:`ex-TajimaDawson1982,ex-Esarey1996`.

PWFA is best performed in 3D and quasi-cylindrical (RZ) geometry, which ensures that the plasma wavelength of the wakefield is modelled with the right scale lengths.
RZ modeling enables efficient modeling if effects of asymmetry shall be ignored (e.g., asymmetric beams and transverse profiles, hosing of the injected beam, etc.).
PWFA is best performed in 3D or quasi-cylindrical (RZ) geometry, in order to correctly capture some of the key physics (structure of the space-charge fields, beamloading, shape of the accelerating bubble in the blowout regime, etc.).
For physical situations that have close-to-cylindrical symmetry, simulations in RZ geometry capture the relevant physics at a fraction of the computational cost of a 3D simulation.
On the other hand, for physical situation with strong asymmetries (e.g., non-round driver, strong hosing of the accelerated beam, etc.), only 3D simulations are suitable.

Additionally, to speed up computation, this example uses the :ref:`boosted frame method <theory-boostedframe>` to effectively model long acceleration lengths.

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