Abstract
An electron beam derived from stripping of ultrarelativistic lead ions has been used to perform calibration measurements on the electron spectrometer of the Advanced Wakefield experiment at CERN. As part of this study, new measurements of the stripping cross-section for ultrarelativistic hydrogen-like lead ions passing through aluminium and silicon have been obtained which demonstrate good agreement with existing measurements and theory. Improvements in terms of electron beam quality and ion beam diagnostic capability, as well as further applications of such an electron beam, are discussed.
Highlights
The Advanced Wakefield (AWAKE) experiment is a proof-ofprinciple plasma wakefield accelerator with demonstrated energy gains for ∼1 pC electron bunches of up to 2 GeV over 10 m of rubidium plasma [1], using proton bunches from the SPS at CERN as a driver.The charge and energy gain are measured using a spectrometer at the end of the beamline [2] comprising a quadrupole doublet, dipole and scintillating screen
An electron beam derived from the stripping of 208Pb81+ ions was delivered to this device in order to study the charge response of the screen and the electron optics
In addition to the specific calibration task considered here, might include injection of a PSI-derived electron beam into the plasma wakefield driven by the ion beam in an AWAKE-like acceleration experiment
Summary
The Advanced Wakefield (AWAKE) experiment is a proof-ofprinciple plasma wakefield accelerator with demonstrated energy gains for ∼1 pC electron bunches of up to 2 GeV over 10 m of rubidium plasma [1], using proton bunches from the SPS at CERN as a driver. An electron beam derived from the stripping of 208Pb81+ ions was delivered to this device in order to study the charge response of the screen and the electron optics. The possibility to strip the ions at different locations, and the imaging capabilities of the spectrometer and stripping foil allowed the electron beam properties to be studied, with a view to assessing its suitability for future AWAKE experiments. As part of the Gamma-Factory project [3] machine development (MD) runs, partially stripped Pb ions (PSI) were accelerated in the SPS.
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