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Localization of ionization-induced trapping in a laser wakefield accelerator using a density down-ramp
/ Hansson, M. (Lund U.) ; Audet, T. L. (LPGP, Orsay) ; Ekerfelt, H. (Lund U.) ; Aurand, B. (Lund U.) ; Gallardo Ganzalez, I. (Lund U.) ; Desforges, F. G. (LPGP, Orsay) ; Davoine, X. (CEA DAM) ; Maitrallain, A. (Saclay) ; Reymond, S. (Lund U. ; ENSTA, Paris) ; Monot, P. (Saclay) et al.
We report on a study on controlled trapping of electrons, by field ionization of nitrogen ions, in laser wakefield accelerators in variable length gas cells. In addition to ionization-induced trapping in the density plateau inside the cells, which results in wide, but stable, electron energy spectra, a regime of ionization-induced trapping localized in the density down-ramp at the exit of the gas cells, is found. [...]
CERN-ACC-2016-0050.-
Geneva : CERN, 2016
- Published in : Plasma Phys. Control. Fusion 58 (2016) 055009
Fulltext: PDF;
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2.
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Investigation of ionization-induced electron injection in a wakefield driven by laser inside a gas cell.
/ Audet, T. L. (LPGP, Orsay) ; Hansson, M. (Lund U.) ; Lee, P. (LPGP, Orsay) ; Desforges, F. G. (LPGP, Orsay) ; Maynard, G. (LPGP, Orsay) ; Dobosz Dufrenoy, S. (Saclay) ; Lehe, R. (LBNL, Berkeley) ; Vay, J.-L. (LBNL, Berkeley) ; Aurand, B. (Lund U.) ; Persson, A. (Lund U.) et al.
Ionization-induced electron injection was investigated experimentally by focusing a driving laser
pulse with a maximum normalized potential of 1.2 at different positions along the plasma density
profile inside a gas cell, filled with a gas mixture composed of 99%H2 þ 1%N2. Changing the laser
focus position relative to the gas cell entrance controls the accelerated electron bunch properties,
such as the spectrum width, maximum energy, and accelerated charge. [...]
CERN-ACC-2016-0090.-
Geneva : CERN, 2016
- Published in : Phys. Plasmas 23 (2016) 023110
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3.
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Enhanced stability of laser wakefield acceleration using dielectric capillary tubes
/ Hannson, M (Lund U.) ; Senje, L (Lund U.) ; Persson, A (Lund U.) ; Lundh, O (Lund U.) ; Wahlström, C-G (Lund U.) ; Desforges, F G (LPGP, Orsay) ; Ju, J (LPGP, Orsay) ; Audet, T L (LPGP, Orsay) ; Cros, B (LPGP, Orsay) ; Dobosz Dufrenoy, S (Saclay) et al.
The stability of beams of laser wakefield accelerated electrons in dielectric capillary tubes is
experimentally investigated. These beams are found to be more stable in charge and pointing than the
corresponding beams of electrons accelerated in a gas jet. [...]
CERN-ACC-2014-0048.-
Geneva : CERN, 2014
- Published in : 10.1103/PhysRevSTAB.17.031303
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4.
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Down-ramp injection and independently controlled acceleration of electrons in a tailored laser wakefield accelerator
/ Hansson, M. (Lund U.) ; Aurand, B. (Lund U.) ; Davoine, X. (CEA DAM) ; Ekerfelt, H. (Lund U.) ; Svensson, K. (Lund U.) ; Persson, A. (Lund U.) ; Wahlström, C.-G. (Lund U.) ; Lundh, O. (Lund U.)
We report on a study on controlled injection of electrons into the accelerating phase of a plasma wakefield accelerator by tailoring the target density distribution using two independent sources of gas. The tailored density distribution is achieved experimentally by inserting a narrow nozzle, with an orifice diameter of only 400 μm , into a jet of gas supplied from a 2 mm diameter nozzle. [...]
CERN-ACC-2015-0211.-
Geneva : CERN, 2015
- Published in : 10.1103/PhysRevSTAB.18.071303
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5.
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EARLI: design of a laser wakefield accelerator for AWAKE
/ Minenna, D F G (IRFU, Saclay) ; Ballage, C (LPGP, Orsay) ; Bencini, V (CERN) ; Bethuys, S (Thales Alenia Space France, Cannes La Bocca) ; Cros, B (LPGP, Orsay) ; Dickson, L (LPGP, Orsay) ; Doebert, S (CERN) ; Farmer, J (Munich, Max Planck Inst.) ; Gschwendtner, E (CERN) ; Jeandet, A (Thales Alenia Space France, Cannes La Bocca) et al.
Following the successful Run 1 experiment, AWAKE has developed a program for Run2 that requires designing and implementing a compact electron source (150 MeV, >= 100 pC) for external injection. The baseline design uses a S- and X-band RF photo-injector gun system. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPA089
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA089
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6.
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Numerical modeling of the Linac4 negative ion source extraction region by 3D PIC-MCC code ONIX
/ Mochalskyy, S (LPGP, Orsay) ; Lettry, J (CERN) ; Minea, T (LPGP, Orsay) ; Lifschitz, AF (LPGP, Orsay) ; Schmitzer, C (CERN) ; Midttun, O (CERN) ; Steyaert, D (CERN)
At CERN, a high performance negative ion (NI) source is required for the 160 MeV H- linear accelerator Linac4. The source is planned to produce 80 mA of H- with an emittance of 0.25 mm mradN-RMS which is technically and scientifically very challenging. [...]
CERN-ATS-2013-015.-
Geneva : CERN, 2013 - 11 p.
- Published in : AIP Conf. Proc. 1515 (2013) 31-40
Fulltext: PDF;
In : 3rd International Symposium on Negative Ions, Beams and Sources, Jyväskylä, Finland, 3 - 7 Sep 2012, pp.31-40
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7.
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An LWFA injector for AWAKE Run 2 experiment
/ Marini, Samuel (IRFU, Saclay, DACM) ; Minenna, Damien F G (IRFU, Saclay, DACM) ; Massimo, Francesco (LPGP, Orsay) ; Batista, Laury (IRFU, Saclay, DACM) ; Bencini, Vittorio (CERN) ; Chancé, Antoine (IRFU, Saclay, DACM) ; Chauvin, Nicolas (IRFU, Saclay, DACM) ; Doebert, Steffen (CERN) ; Farmer, John (Munich, Max Planck Inst.) ; Gschwendtner, Edda (CERN) et al.
A beam physics design has been carried out for a 200 MeV-LWFA injector to the AWAKE Run 2 experiment as an alternative to the reference RF injector. It is composed of a laser-plasma acceleration stage and a transport line. [...]
2024 - 3 p.
- Published in : JACoW IPAC 2024 (2024) MOPR38
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPR38
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9.
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Beam physics studies for a high charge and high beam quality laser-plasma accelerator
/ Marini, Samuel (IRFU, Saclay, DACM) ; Minenna, Damien F G (IRFU, Saclay, DACM) ; Massimo, Francesco (LPGP, Orsay) ; Batista, Laury (IRFU, Saclay, DACM) ; Bencini, Vittorio (CERN) ; Chancé, Antoine (IRFU, Saclay, DACM) ; Chauvin, Nicolas (IRFU, Saclay, DACM) ; Doebert, Steffen (CERN) ; Farmer, John (Munich, Max Planck Inst.) ; Gschwendtner, Edda (CERN) et al.
Electron acceleration by laser-plasma techniques is approaching maturity and is getting ready for the construction of particle accelerators with dedicated applications. We present a general methodology showing how beam physics studies can be used to achieve a specific parameter set in a laser-plasma accelerator. [...]
2024 - 15 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 063401
Fulltext: PDF;
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10.
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Correlation of H$^{-}$ beam properties to Cs-coverage
/ Lettry, J (CERN) ; Vnuchenko, A (CERN) ; Bertolo, S (CERN) ; Mastrostefano, C (CERN) ; O'Neil, M (CERN) ; di Lorenzo, F (CERN) ; Coutron, Y (CERN) ; Steyeart, D (CERN) ; Riffaud, B (CERN) ; Thiboud, J (CERN) et al.
A caesiated RF driven source delivers H$^{-}$ ions that, after stripping at the end of the 160 MeV H$^{-}$ linear injector, provides protons to CERN's accelerator complex including LHC, where the protons reached a record energy of 6.8 TeV. In Caesiated RF sources, H$^{-}$ ions are produced via dissociative attachment of electrons onto roto-vibrationally excited H$_{2}$-molecules (volume) and re-emission as negative ions of protons or hydrogen atoms colliding on a low work function caesiated molybdenum plasma electrode (surface). [...]
2023 - 10 p.
- Published in : JINST 18 (2023) C06023
In : 8th International symposium on Negative Ions, Beams and Sources (NIBS'22), Padua, Italy, 2 - 7 Oct 2022, pp.C06023
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