IPAC'25 - the 16th International Particle Accelerator Conference

First measurements of electron acceleration with plasma density steps at AWAKE

THAD2

5 Jun 2025, 09:50

20m

Hall 101 (TICC)

Contributed Oral Presentation MC3.A22 Plasma Wakefield Acceleration THAD:Novel Particle Sources and Acceleration Techniques (Contributed)

Speaker

Fern Pannell (University College London)

Description

The Advanced Wakefield (AWAKE) experiment is a proof-of-principle accelerator facility at CERN (Geneva, Switzerland). Proton bunches from the CERN Super Proton Synchrotron are used to drive wakefields in 10 metres of laser-ionised rubidium plasma, over which externally injected 19 MeV electrons are accelerated. Run 1 of AWAKE successfully demonstrated the self-modulation of the long proton bunch, and the acceleration of electrons to 2 GeV. Upgrades to the rubidium vapour source during Run 2 have enabled the use of a plasma density step, and variation of the plasma length through the insertion of foils along the source to dump the laser pulse. When placed suitably within the development of self-modulation, the density step is expected to preserve the wakefield amplitude, and therefore accelerating gradient, over longer distances than with uniform plasma. This work presents the first measurements of electron acceleration with a density step, studied as a function of the plasma length.