AWAKE -- a Proton-Driven Plasma Wakefield Experiment at CERN

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AWAKE -- A Proton-driven Plasma Wakefield Experiment at CERN Swapan Chattopadhyay Fermilab March 9, 2016 4:00 p.m. - Wilson Hall, One West High energy intense proton beams such as the in the 7 TeV x 7 TeV Large Hadron Collider at CERN have sufficient energy stored per proton bunch to power and accelerate an electron beam to an energy of 600 GeV if a suitable mechanism could be found to transform all the stored proton beam energy into the electrons. A suitably designed plasma column could be such a 'transformer', with the potential of being able to generate sufficiently high electromagnetic wakefields, upon excitation by the proton beams, to accelerate an electron beam to an energy of 600 GeV in a single pass through the plasma column. The idea will be tested experimentally in a "scaled-down" prototype proof-of-principle demonstration experiment at CERN known as AWAKE. Proton beams of 400 GeV energy will be extracted from the Super Proton Synchrotron and used to excite a specially dersigned plasma column and the generated wakefields will be sampled by specially prepared electrons from an injector for acceleration. The experiment has been approved by the CERN Scientific Program Committee for some years now and a global collaboration of institutions from across Europe and Russia (and potential Asian and North American collaborators) is busy preparing the experiment in the 2018-2020 time scale. The experimental cave previously used for the Gran Sasso long baseline neutrino experiment is being prepared by CERN to launch this demonstration experiment. I will describe the status of this experiment and its promise for future high energy electron-proton and electron-positron colliders..

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A Spectrometer for Proton Driven Plasma Accelerated Electrons at Awake - Recent Developments∗
Proceedings of IPAC2016, Busan, Korea WEPMY024 A SPECTROMETER FOR PROTON DRIVEN PLASMA ACCELERATED ELECTRONS AT AWAKE - RECENT DEVELOPMENTS∗ Lawrence Charles Deacon, Simon Jolly, Fearghus Keeble, UCL, London Aurélie Goldblatt, Stefano Mazzoni, Alexey Petrenko, CERN, Geneva Bartolomej Biskup, CERN, Geneva; Czech Technical University, Prague 6 Matthew Wing, UCL, London; DESY, Hamburg; University of Hamburg, Hamburg Abstract SPECTROMETER DESIGN The AWAKE experiment is to be constructed at the CERN Neutrinos to Gran Sasso facility (CNGS). This will be the first experiment to demonstrate proton-driven plasma wake- field acceleration. The 400 GeV proton beam from the CERN SPS will excite a wakefield in a plasma cell several meters in length. To probe the plasma wakefield, electrons of 10–20 MeV will be injected into the wakefield follow- ing the head of the proton beam. Simulations indicate that electrons will be accelerated to GeV energies by the plasma wakefield. The AWAKE spectrometer is intended to measure both the peak energy and energy spread of these accelerated electrons. Results of beam tests of the scintillator screen Figure 1: A 3D CAD image of the spectrometer system output are presented, along with tests of the resolution of annotated with distances along the z direction from the exit the proposed optical system. The results are used together of the plasma cell to the magnetic centers of magnets, and with a BDSIM simulation of the spectrometer system to pre- the center of the scintillator screen. dict the spectrometer performance for a range of possible accelerated electron distributions. INTRODUCTION RESOLUTION Proton bunches are the most promising drivers of wake- Optical System fields to accelerate electrons to the TeV energy scale in a The resolution of the energy spectrometer will ultimateley single stage.
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