The Helix as a Linear Accelerator for Protons

Chick, D.R.; Petrie, Daniel

doi:10.1038/168782b0

Cited by 9 publications

(4 citation statements)

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“…The helical wire acts both as an electromagnetic field guide and a delay line for the discharge current pulse. Such a structure is commonly used in radio-frequency accelerators [44,45] and travelling wave tubes [46].…”

Section: Introductionmentioning

confidence: 99%

Physics of chromatic focusing, post-acceleration and bunching of laser-driven proton beams in helical coil targets

Bardon¹,

Moreau²,

Romagnani³

et al. 2020

Plasma Phys. Control. Fusion

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To increase the fluence and the maximum energy of laser driven ion beams in view of potential applications such as isochoric heating of dense material or isotope production, it has been proposed to attach a helical coil normally to the rear side of the irradiated target. By driving the target discharge current pulse through the coil, this scheme allows to focus, post-accelerate and select in energy a part of the ion beam. The previously published results are extended to higher laser pulse energies and longer coils. This leads to an increased number of guided protons and the generation of several proton bunches. Large scale particle-in-cell simulations with realistic boundary conditions reproduce well the experimental results. A detailed analysis of the numerical simulations and an analytical model demonstrate the crucial role of the discharge current pulse dispersion in the proton bunch trapping and focusing.

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Section: Introductionmentioning

confidence: 99%

Physics of chromatic focusing, post-acceleration and bunching of laser-driven proton beams in helical coil targets

Bardon¹,

Moreau²,

Romagnani³

et al. 2020

Plasma Phys. Control. Fusion

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“…Since the 1940s, the helix stands as the preferred geometry 30,31 for SWSs of TWTs, especially for communications, because it allows a broad bandwidth and large interaction impedance with a simple design. The development of helix theories and simulations is a recurrent topic in the TWT literature (for a non exhaustive list, see Refs 29,30,[59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] as well as for other devices like particle accelerators, 75,76 free-electron lasers 77 or gyrotrons. 78 Two of the most popular models are the sheath helix model focusing on the fundamental mode of propagation, and its extension, the tape helix model, involving an infinite set of space harmonics.…”

Section: B the Helix Geometry For Twtsmentioning

confidence: 99%

Time simulation of the nonlinear wave–particle interaction in meters-long traveling-wave tubes

et al. 2021

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We propose a multi-particle self-consistent Hamiltonian (derived from an N -body description) that is applicable for periodic structures such as traveling-wave tubes (TWTs), gyrotrons, free-electron lasers, or particle accelerators. We build a 1D symplectic multi-particle algorithm to simulate the nonlinear wave-particle interaction in the time domain occurring in an experimental 3-meters long helix TWT. Our algorithm is efficient thanks to a drastic reduction model. A 3D helix version of our reduction model is provided. Finally, we establish an explicit expression of the electromagnetic power in the time domain and in non-monochromatic (non "continuous waveform") regime.

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“…The use of focusing space-charge forces of magnetically confined electron cloud in beam transport lines was first proposed by Gabor in 1947 [16] -see figure 3a. The original proposal assumed an external source of electrons (a hot circular cathode), as it was later considered and used in MeV-class proton sources [17][18][19][20]. Other practical Gabor lenses accumulated ionization electrons produced by the primary beams and were used in low energy beam transport (LEBT) lines [21][22][23].…”

Section: Jinst 16 P03039mentioning

confidence: 99%

Electron lenses: historical overview and outlook

Shiltsev¹

2021

J. Inst.

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The first electron lenses -understood as "lenses made of electrons" rather than "lenses to focus electrons" -were envisioned in the mid-1990s and built in the early 2000s for compensation of beam-beam effects in the Tevatron proton-antiproton collider. Since then, the lenses -a novel instrument for high-energy particle accelerators -have been added to the toolbox of modern beam facilities, being particularly useful for the energy frontier superconducting hadron colliders ("supercolliders"). In this article we briefly present the history of ideas and developments toward effective use of low-energy high-current bright electron beams in high energy accelerators and discuss the promise of their future applications.

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The Helix as a Linear Accelerator for Protons

Cited by 9 publications

References 0 publications

Physics of chromatic focusing, post-acceleration and bunching of laser-driven proton beams in helical coil targets

Physics of chromatic focusing, post-acceleration and bunching of laser-driven proton beams in helical coil targets

Time simulation of the nonlinear wave–particle interaction in meters-long traveling-wave tubes

Electron lenses: historical overview and outlook

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