BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Coupling of multiple proton driven wakefield accelerator stages DTSTART:20220629T090000Z DTEND:20220629T110000Z DTSTAMP:20260626T060038Z UID:f0483b8d-5097-4002-b5bc-af3baa59001d SEQUENCE:6 CREATED:20220627T081105Z DESCRIPTION:AbstractThe AWAKE experiment aims to accelerate leptons to the TeV regime. It will accomplish its goal with a highly energetic proton be am as a wakefield driver. However\, to increase the magnitude of the accel eration gradients produced by the driver\, one must extend its propagation distance. Prolonging the current stage would be experimentally challengin g due to the self-consistent evolution of the ionisation front used during this stage.We propose adding a pre-formed plasma stage\, to the existing stage\, where the half-modulated beam (result of the first stage) can prop agate. This work aims to study how the wake of the unmodulated part intera cts with the modulated part of the beam during the second stage. We first analysed the impact of various wakefield parameters on the structure of th e modulated beam\, and concluded that the wake'\;s phase is the most r elevant parameter for the conservation of the beam. Next\, we analysed in detail the propagation of a partially modulated beam. The results showed t hat seeding the modulation of the unmodulated part is the best approach to guarantee higher acceleration gradients during the second stage.Lastly\, we demonstrated that we can adjust the length of the simultaneously accele rating and focusing region of a wakefield produced by two sources\, by con trolling their width\, and the spacing between them. This is an important result that allows us to increase the accelerator'\;s efficiency\, by increasing the number of efficiently accelerated particles. LAST-MODIFIED:20220627T083344Z LOCATION:Sala C10\, Piso 1\, Pavilhão Central\, Campus da Alameda URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/coupling-of-multiple-proto n-driven-wakefield-accelerator-stages/ X-ALT-DESC;FMTTYPE=text/html:

Abstract

The AWAKE experime nt aims to accelerate leptons to the TeV regime. It will accomplish its go al with a highly energetic proton beam as a wakefield driver. However\, to increase the magnitude of the acceleration gradients produced by the driv er\, one must extend its propagation distance. Prolonging the current stag e would be experimentally challenging due to the self-consistent evolution of the ionisation front used during this stage.


We propose adding a pre-formed plasma stage\, to the existing sta ge\, where the half-modulated beam (result of the first stage) can propaga te. This work aims to study how the wake of the unmodulated part interacts with the modulated part of the beam during the second stage. We first ana lysed the impact of various wakefield parameters on the structure of the m odulated beam\, and concluded that the wake'\;s phase is the most rele vant parameter for the conservation of the beam. Next\, we analysed in det ail the propagation of a partially modulated beam. The results showed that seeding the modulation of the unmodulated part is the best approach to gu arantee higher acceleration gradients during the second stage.


Lastly\, we demonstrated that we can adjust the len gth of the simultaneously accelerating and focusing region of a wakefield produced by two sources\, by controlling their width\, and the spacing bet ween them. This is an important result that allows us to increase the acce lerator'\;s efficiency\, by increasing the number of efficiently accel erated particles.

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