Effect of the electrostatic plasma lens on the emittance of a high-current heavy ion beam

Chekh, Yu.; Goncharov, A.; Protsenko, I. M.; Brown, Ian

doi:10.1063/1.1855428

Cited by 12 publications

(5 citation statements)

References 11 publications

(15 reference statements)

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“…The goal is to avoid the heavy particle losses produced by the parametric resonances [47,167], which can lead to halo formation that is detrimental to the beam quality, and can result in damage to the accelerator walls. A theory which can quantitatively predict this effect is, therefore, highly desirable for a better understanding of the physics of beam transport [50,140,[168][169][170].…”

Section: Non-neutral Plasmasmentioning

confidence: 99%

Nonequilibrium statistical mechanics of systems with long-range interactions

et al. 2014

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Systems with long-range (LR) forces, for which the interaction potential decays with the interparticle distance with an exponent smaller than the dimensionality of the embedding space, remain an outstanding challenge to statistical physics. The internal energy of such systems lacks extensivity and additivity. Although the extensivity can be restored by scaling the interaction potential with the number of particles, the non-additivity still remains. Lack of additivity leads to inequivalence of statistical ensembles. Before relaxing to thermodynamic equilibrium, isolated systems with LR forces become trapped in out-of-equilibrium quasi-stationary state (qSS), the lifetime of which diverges with the number of particles. Therefore, in thermodynamic limit LR systems will not relax to equilibrium. The qSSs are attained through the process of collisionless relaxation. Density oscillations lead to particle-wave interactions and excitation of parametric resonances. The resonant particles escape from the main cluster to form a tenuous halo. Simultaneously, this cools down the core of the distribution and dampens out the oscillations. When all the oscillations die out the ergodicity is broken and a qSS is born. In this report, we will review a theory which allows us to quantitatively predict the particle distribution in the qSS. The theory is applied to various LR interacting systems, ranging from plasmas to self-gravitating clusters and kinetic spin models.

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Section: Non-neutral Plasmasmentioning

confidence: 99%

Nonequilibrium statistical mechanics of systems with long-range interactions

et al. 2014

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“…At low pressure, this radial transport can be caused by small azimuthal asymmetries in the applied electric or magnetic fields [37]. Further work was directed towards the design of an electrostatic lens for the space-charge-compensated transport of a high intensity heavy ion beam [39]. In this case, the absence of emittance growth due to the lens was reported [39].…”

Section: Introductionmentioning

confidence: 99%

“…Further work was directed towards the design of an electrostatic lens for the space-charge-compensated transport of a high intensity heavy ion beam [39]. In this case, the absence of emittance growth due to the lens was reported [39].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

et al. 2021

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An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m=1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.

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“…At low pressure, this radial transport can be caused by small azimuthal asymmetries in the applied electric or magnetic fields [37]. Further work was directed towards the design of an electrostatic lens for the space-chargecompensated transport of a high intensity heavy ion beam [39]. In this case, the absence of emittance growth due to the lens was reported [39].…”

Section: Introductionmentioning

confidence: 99%

“…Further work was directed towards the design of an electrostatic lens for the space-chargecompensated transport of a high intensity heavy ion beam [39]. In this case, the absence of emittance growth due to the lens was reported [39].…”

Section: Introductionmentioning

confidence: 99%

Anomalous beam transport through Gabor (plasma) lens prototype

Nonnenmacher,

Dascalu,

Bingham

et al. 2021

Preprint

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An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m = 1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.

show abstract

Effect of the electrostatic plasma lens on the emittance of a high-current heavy ion beam

Cited by 12 publications

References 11 publications

Nonequilibrium statistical mechanics of systems with long-range interactions

Nonequilibrium statistical mechanics of systems with long-range interactions

Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

Anomalous beam transport through Gabor (plasma) lens prototype

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