Abstract
We briefly compare in numerical simulations the relativistic ionization front and electron bunch seeding of the self-modulation of a relativistic proton bunch in plasma. When parameters are such that initial wakefields are equal with the two seeding methods, the evolution of the maximum longitudinal wakefields along the plasma is similar. We also propose a possible seeding/injection scheme using a single plasma that we will study in upcoming simulations works.
Highlights
Seeding a process consists in providing a signal level larger than the noise level present in the system, from which the process could uncontrollably grow
We briefly compared relativistic ionization front seeding, emulated in numerical simulations by a cut bunch, with electron bunch seeding in simple cases
We showed that the evolution of the wakefields as well as their parameters can be similar in both seeding schemes
Summary
Seeding a process consists in providing a signal level larger than the noise level present in the system, from which the process could uncontrollably grow. The relativistic ionization front method requires a short laser pulse co-propagating within the proton bunch, and a low ionization potential gas or vapor to keep the laser pulse intensity relatively low In this case, it is the fast creation of plasma and the onset of beam plasma interaction within the bunch that drives the seed wakefields. It is the fast creation of plasma and the onset of beam plasma interaction within the bunch that drives the seed wakefields This method was very successfully used in the AWAKE experiment [6] with a rubidium vapor of density (1-10)×1014 cm−3 and with a laser pulse 120 fs-long (λ0 = 780 nm) and an intensity I0 ∼10 TW/cm to fully ionize the atoms of their first electron [7, 8]. That means that the longitudinal wakefields amplitude the laser pulse drives is on the order of
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