2016
DOI: 10.1016/j.nima.2016.01.060
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Indirect self-modulation instability measurement concept for the AWAKE proton beam

Abstract: AWAKE, the Advanced Proton-Driven Plasma Wakefield Acceleration Experiment, is a proof-of-principle R&D experiment at CERN using a 400 GeV/c proton beam from the CERN SPS (longitudinal beam size σ z = 12 cm) which will be sent into a 10 m long plasma section with a nominal density of ≈ 7 · 10 14 atoms/cm 3 (plasma wavelength λ p = 1.2 mm). In this paper we show that by measuring the time integrated transverse profile of the proton bunch at two locations downstream of the AWAKE plasma, information about the occ… Show more

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Cited by 10 publications
(10 citation statements)
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“…The thickness of the first imaging screen that we inserted was 0.3 mm which means that 1 out of 2500 protons has a nuclear interaction with the screen material and can create secondary particles. Combining this estimate with a previous one on Coulomb scattering of the protons [4], we do not expect any measurable change of the proton beam profile and we also confirmed this with measurement shown of the right image of Figure 8.…”
Section: Signal To Background Measurementssupporting
confidence: 89%
“…The thickness of the first imaging screen that we inserted was 0.3 mm which means that 1 out of 2500 protons has a nuclear interaction with the screen material and can create secondary particles. Combining this estimate with a previous one on Coulomb scattering of the protons [4], we do not expect any measurable change of the proton beam profile and we also confirmed this with measurement shown of the right image of Figure 8.…”
Section: Signal To Background Measurementssupporting
confidence: 89%
“…Protons in the defocusing phase of the wakefields exit the plasma close to the plasma center and appear as a narrow core on transverse profiles downstream the plasma. In [20] it is shown that the defocusing angle is on the order of 1 mrad for the 400 GeV/c protons. For the indirect SMI measurements two beam-imaging screens (BTVs) at a distance of ≈ 8 m will be inserted downstream the plasma cell in order to measure the transverse bunch shape and the beam size.…”
Section: Indirect Smi Measurementmentioning
confidence: 99%
“…In order to determine the maximum defocused proton bunch radius, we put together a procedure that (semi-) automatically determines the largest radius at which light and thus protons are detected on the halo camera images. This procedure assumesas observed in simulations [5]-that the defocused proton halo has a distinct maximum radius. The method uses a standard contour subroutine for 2D images 2 .…”
Section: Methodsmentioning
confidence: 99%