Minimization of the emittance growth of multi-charge particle beams in the charge stripping section of RAON

Hwang, Ji-Gwang; Kim, Eun−San; Kim, Hye-Jin; Jeon, D.

doi:10.1016/j.nima.2014.08.018

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…(10) yields directly the kinetic angular momentum of the outgoing state. In order to keep the degradation of the beam quality due to scattering in the stripping medium under control, the beam has to be sufficiently focused, so that the incoming transverse momenta are increased [22,38]. Thus a better beam quality of the incoming beam will require a smaller beam size in the stripping medium and correspondingly higher fields to create a certain angular momentum.…”

Section: Other Charged Particlesmentioning

confidence: 99%

Quantum mechanical formulation of the Busch theorem

Floettmann

Karlovets

2020

Phys. Rev. A

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Due to the conservation of the canonical angular momentum, charged particle beams which are generated inside a solenoid field acquire a kinetic angular momentum outside of the solenoid field. The relation of kinetic orbital angular momentum to the field strength and the beam size on the cathode is called the Busch theorem. We formulate the Busch theorem in quantum mechanical form and discuss the generation of quantized vortex beams, i.e., beams carrying a quantized orbital angular momentum. Immersing a cathode in a solenoid field presents an efficient and flexible method for the generation of electron vortex beams, while, e.g., vortex ions can be generated by immersing a charge stripping foil in a solenoid field. Both techniques are utilized at accelerators for the production of nonquantized vortex beams. As a highly relevant use case we discuss in detail the conditions for the generation of quantized vortex beams from an immersed cathode in an electron microscope. General possibilities of this technique for the production of vortex beams of other charged particles are pointed out.

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Section: Other Charged Particlesmentioning

confidence: 99%

Quantum mechanical formulation of the Busch theorem

Floettmann

Karlovets

2020

Phys. Rev. A

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“…with the bunch head at > z 0. Chromatic sextupoles were used to reduce the critical second oder terms T 511 and T 521 to increase the bunching factor 39,40 . After the compensation, the T 511 and T 521 values are reduced to be 0.32 1/m and 0.13, respectively, and the bunching factor is increased from 5% to about 9%.…”

Section: Parameters Units Valuementioning

confidence: 99%

Generation of intense and coherent sub-femtosecond X-ray pulses in electron storage rings

Hwang

Schiwietz

Abo-Bakr

et al. 2020

Sci Rep

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temporally short X-ray pulses are an indispensable tool for the study of electron transitions close to the fermi energy and structural changes in molecules undergoing chemical reactions which take place on a timescale of hundreds of femtoseconds. The time resolution of experiments at 3 rd generation light sources which produce intense synchrotron radiation is limited fundamentally by the electronbunch length in the range of tens of picoseconds. Here we propose a new scheme for the generation of intense and coherent sub-femtoseconds soft X-ray pulses in storage rings by applying the echo-enabled Harmonic Generation (eeHG) method. Many issues for obtaining the eeHG structure such as two modulators and a radiator are solved by a paradigm shift in an achromatic storage ring cell. numerical demonstration of the feasibility of the scheme for the BeSSY ii beam parameters is presented.

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“…Lower β functions evidently reduce this effect. Minimization of the emittance growth is obtained by placing the target in a beam waist and setting the angular contribution from the multiple scattering similar to or smaller than the beam divergence [16]. This matching reduces beam filamentation [15].…”

Section: Positron Storage Ringmentioning

confidence: 99%

Low emittance muon accelerator studies with production from positrons on target

Boscolo

Antonelli

Blanco-García

et al. 2018

Phys. Rev. Accel. Beams

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A new scheme to produce very low emittance muon beams using a positron beam of about 45 GeV interacting on electrons on target is presented. One of the innovative topics to be investigated is the behaviour of the positron beam stored in a low emittance ring with a thin target, that is directly inserted in the ring chamber to produce muons. Muons can be immediately collected at the exit of the target and transported to two µ + and µ − accumulator rings and then accelerated and injected in muon collider rings. We focus in this paper on the simulation of the e + beam interacting with the target, the effect of the target on the 6-D phase space and the optimization of the e + ring design to maximize the energy acceptance. We will investigate the performance of this scheme, ring plus target system, comparing different multi-turn simulations. The source is considered for use in a multi-TeV collider in ref. [7].

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Minimization of the emittance growth of multi-charge particle beams in the charge stripping section of RAON

Cited by 12 publications

References 8 publications

Quantum mechanical formulation of the Busch theorem

Quantum mechanical formulation of the Busch theorem

Generation of intense and coherent sub-femtosecond X-ray pulses in electron storage rings

Low emittance muon accelerator studies with production from positrons on target

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