AWAKE Proton Beam Commissioning

Schmidt, Janet; Barrientos, D.; Marı́n, M.; Biskup, B.; Boccardi, Andrea; Bogey, T; Bohl, Thomas; Bracco, Chiara; Cave, S. Cettour; Damerau, Heiko; Fedosseev, Valentin; Friebel, Florence; Gessner, Spencer; Goldblatt, AurÃ©lie; Gschwendtner, Edda; Jensen, L.; Kain, V.; Lefèvre, T.; Mazzoni, Stefano; Molendijk, John; Moody, J. T.; Pardons, A.; Pasquino, Chiara; Rey, S.; Rieger, K.; Vincke, Helmut; Wehrle, U.

doi:10.18429/jacow-ipac2017-tupik032

Cited by 2 publications

(1 citation statement)

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“…In the experiments presented here, we use n pe = 0.97 × 10 14 cm −3 and n pe = 7.3 × 10 14 cm −3 , which in the following we refer to as low and high plasma electron densities, respectively. The CERN Super Proton Synchrotron (SPS) delivers the 44.9 nC, σ z = 6.3 cm bunch of 400 GeV/c protons 16 . The final focusing system of the transport line provides flexibility for placing the waist of the beam at different locations z * with respect to the plasma entrance (z = 0), and for varying the transverse size σ r0 of the bunch entering the plasma.…”

Section: Methodsmentioning

confidence: 99%

Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma

Verra¹

2022

Phys. Rev. Lett.

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Self-modulation is a beam-plasma instability that is useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results showing that, when increasing the ratio between the initial transverse size of the bunch and the plasma skin depth, the instability occurs later along the bunch, or not at all, over a fixed plasma length, because the amplitude of the initial wakefields decreases. We show cases for which self-modulation does not develop and we introduce a simple model discussing the conditions for which it would not occur after any plasma length. Changing bunch size and plasma electron density also changes the growth rate of the instability. We discuss the impact of these results on the design of a particle accelerator based on the self-modulation instability seeded by a relativistic ionization front, such as the future upgrade of the AWAKE experiment.

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Section: Methodsmentioning

confidence: 99%

Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma

Verra¹

2022

Phys. Rev. Lett.

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Proton beam defocusing in AWAKE: comparison of simulations and measurements

Gorn

Turner

Adli

et al. 2020

Plasma Phys. Control. Fusion

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In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which agrees with simulations by the two-dimensional (axisymmetric) particle-in-cell code LCODE to about 5%. The agreement is achieved in beam population scans at two selected plasma densities and in the scan of longitudinal plasma density gradient. The agreement is reached only in the case of a wide enough simulation box (several plasma wavelengths) that is closer to experimental conditions, but requires more computational power. Therefore, particle-in-cell codes can be used to interpret the SSM physics underlying the experimental data.

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AWAKE Proton Beam Commissioning

Cited by 2 publications

References 0 publications

Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma

Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma

Proton beam defocusing in AWAKE: comparison of simulations and measurements

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