Commissioning of beam instrumentation at the CERN AWAKE facility after integration of the electron beam line

Gorgisyan, Ishkhan; Mazzoni, Stefano; Bürger, S.; Jensen, L.; Jensen, Steen; Medina, David F.; Wendt, M.; Søby, L.; Gschwendtner, Edda; Gessner, Spencer; Doebert, S.; Pépitone, K.; Bracco, Chiara; Velotti, Francesco; Wing, M.; Jolly, S.; Cascella, M.; Verzilov, V.

doi:10.1088/1742-6596/1067/7/072015

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Measurements have been performed to validate the predicted beam characteristics by recording the transverse beam profile and particle energy spectra (see Figure 1 for details). This is achieved using chromium-doped alumina-ceramic (Chromox) luminescence screens [38][39][40] placed in the beam path downstream of the target. When ionizing particles or radiation are incident on the screen, it emits red visible light with a few ms decay time.…”

Section: Mainmentioning

confidence: 99%

Laboratory realization of relativistic pair-plasma beams

Arrowsmith,

Simon,

Bilbao

et al. 2024

Preprint

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Relativistic electron-positron (e±)plasmas are ubiquitous in extreme astrophysical environments such as black holes and neutron star magnetospheres, where accretion-powered jets and pulsar winds are expected to be enriched with such pair plasmas. Their behaviour is quite different from typical electron-ion plasmas due to the matter-antimatter symmetry of the charged components and their role in the dynamics of such compact objects is believed to be fundamental. So far, our experimental inability to produce large yields of positrons in quasi-neutral beams has restricted the understanding of electron-positron pair plasmas to simple numerical and analytical studies which are rather limited. We present first experimental results confirming the generation of high-density, quasi-neutral, relativistic electron-positron pair beams using the 440 GeV/c beam at CERN's Super Proton Synchrotron (SPS) accelerator. The produced pair beams have a volume that fills multiple Debye spheres and are thus able to sustain collective plasma oscillations. Our work opens up the possibility of directly probing the microphysics of pair plasmas beyond quasi-linear evolution into regimes that are challenging to simulate or measure via astronomical observations.

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Section: Mainmentioning

confidence: 99%

Laboratory realization of relativistic pair-plasma beams

Arrowsmith,

Simon,

Bilbao

et al. 2024

Preprint

Self Cite

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“…1 for details), allowing validation of FLUKA simulations. In both measurements, pair fluence is measured using luminescence screens made of chromium-doped alumina-ceramic (Chromox) 38 – 40 . When ionizing particles or radiation are incident on the screen, the screen emits red visible light with a few ms decay time.…”

Section: Introductionmentioning

confidence: 99%

Laboratory realization of relativistic pair-plasma beams

Arrowsmith,

Simon,

Bilbao

et al. 2024

Nat Commun

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Relativistic electron-positron plasmas are ubiquitous in extreme astrophysical environments such as black-hole and neutron-star magnetospheres, where accretion-powered jets and pulsar winds are expected to be enriched with electron-positron pairs. Their role in the dynamics of such environments is in many cases believed to be fundamental, but their behavior differs significantly from typical electron-ion plasmas due to the matter-antimatter symmetry of the charged components. So far, our experimental inability to produce large yields of positrons in quasi-neutral beams has restricted the understanding of electron-positron pair plasmas to simple numerical and analytical studies, which are rather limited. We present the first experimental results confirming the generation of high-density, quasi-neutral, relativistic electron-positron pair beams using the 440 GeV/c beam at CERN’s Super Proton Synchrotron (SPS) accelerator. Monte Carlo simulations agree well with the experimental data and show that the characteristic scales necessary for collective plasma behavior, such as the Debye length and the collisionless skin depth, are exceeded by the measured size of the produced pair beams. Our work opens up the possibility of directly probing the microphysics of pair plasmas beyond quasi-linear evolution into regimes that are challenging to simulate or measure via astronomical observations.

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“…For the electrons, there are 5 shorted stripline BPMs in the common beam line as shown in figure 1. The electron BPMs operate at 404 MHz with position resolution of 10 µm in both planes [6].…”

Section: Introductionmentioning

confidence: 99%

A beam position monitor for electron bunch detection in the presence of a more intense proton bunch for the AWAKE Experiment

Pakuza

Burrows

Corsini

et al. 2023

J. Phys.: Conf. Ser.

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The Advanced Proton Driven Plasma Wakefield Experiment (AWAKE) at CERN uses 6 cm long proton bunches extracted from the Super Proton Synchrotron (SPS) at 400 GeV beam energy to drive high gradient plasma wakefields for the acceleration of electron bunches to 2 GeV within a 10 m length. Knowledge and control of the position of both copropagating beams is crucial for the operation of the experiment. Whilst the current electron beam position monitoring system at AWAKE can be used in the absence of the proton beam, the proton bunch signal dominates when both particle bunches are present simultaneously. A new technique based on the generation of Cherenkov diffraction radiation (ChDR) in a dielectric material placed in close proximity to the particle beam has been designed to exploit the large bunch length difference of the particle beams at AWAKE, 200 ps for protons versus a few ps for electrons, such that the electron signal dominates. Hence, this technique would allow for the position measurement of a short electron bunch in the presence of a more intense but longer proton bunch. The design considerations, numerical analysis and plans for tests at the CERN Linear Electron Accelerator for Research (CLEAR) facility are presented.

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Commissioning of beam instrumentation at the CERN AWAKE facility after integration of the electron beam line

Cited by 3 publications

References 3 publications

Laboratory realization of relativistic pair-plasma beams

Laboratory realization of relativistic pair-plasma beams

Laboratory realization of relativistic pair-plasma beams

A beam position monitor for electron bunch detection in the presence of a more intense proton bunch for the AWAKE Experiment

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