Self-consistent study of space-charge-dominated beams in a misaligned transport system

Babu, P. Sing; Goswami, A.; Pandit, V.S.

doi:10.1016/j.nima.2013.05.058

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…[5][6][7][8][9][10][11][12] In this section we briefly describe the steps involved in the development of multispecies 2D PIC code using standard methods used to simulate single species charge particle beams. 13 We consider a continuous axisymmetric multispecies beam with momentum m j c j b j c for species j, propagating in a solenoid based transport line along the direction s ¼ z in the laboratory frame ðx; y; zÞ.…”

Section: Macroparticle Modelmentioning

confidence: 99%

Effect of subdominant species on the evolution of intense primary beam in a low energy beam transport line

2013

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The dynamics of space-charge-dominated multispecies beam with different distributions has been studied in a solenoid based low energy beam transport line using a particle-in-cell simulation method. Results are presented in wide parameter regimes covering emittance dominated as well as space charge dominated multispecies beams consisting of p, H2+, and H3+ beams. Simulation shows the formation of hollow distribution of H2+ and H3+ beams around the desired proton beam and separation is more distinct as the fraction of proton is increased. The hollow formation is almost independent of combination of H2+ and H3+ beams, once the fraction of proton beam is fixed. The emittance growth of proton is found to increase sharply in the space-charge-dominated regime and is more in the cases where proton fraction is low.

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Section: Macroparticle Modelmentioning

confidence: 99%

Effect of subdominant species on the evolution of intense primary beam in a low energy beam transport line

2013

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“…PIC simulation methods have been widely used for the self-consistent analysis of beam dynamics in high intensity accelerators and transport systems [10][11][12][13][14][15][16]. In order to predict the beam behaviour more accurately, we have developed a 2D self-consistent multispecies PIC simulation code [17] and used it to study the evolution of p, H + 2 and H + 3 beams.…”

Section: Introductionmentioning

confidence: 99%

Transport of intense proton beam in the presence of subdominant species in a low energy beam transport system

2016

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The dynamics of space-charge-dominated low energy proton beam in the presence of H + 2 and H + 3 beams has been studied in a solenoid based transport system using particle-in-cell (PIC) simulation method. Multispecies envelope equation and random search technique have been used to transport and match the primary beam considering two options. The PIC simulation shows the formation of hollow distribution of H + 2 and H + 3 beams around the proton beam in the first case where the waist of the proton beam is formed in between the solenoids and it is absent in the second case where the beam size is kept large in between the solenoids. Separation of hollow distribution appears more distinct as the proton fraction is increased and is almost independent of the combination of H + 2 and H + 3 beams for a given proton fraction. This effect helps to reject the unwanted species more effectively. The evolution of rms size and emittance of the proton beam has been studied in the presence of a circular aperture using KV and Gaussian distributions for the species in both the cases. K: Accelerator modelling and simulations (multi-particle dynamics; single-particle dynamics); Beam dynamics 1Corresponding author.

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“…[4][5][6][7] It is one of the challenges to control the beam centroid and alignment of the beam with respect to the focusing field axis, which may otherwise lead to the loss of beam particles. [8][9][10] The problem of beam losses is a serious concern in the design of efficient and low cost small-aperture focusing systems [11][12][13] and transfer lines for accelerators required for above mentioned applications. In this regard, a matter of recent interest is to study the dynamics of intense off-axis beam under the influences of both the beam space charge and image charge (induced on the conducting walls).…”

Section: Introductionmentioning

confidence: 99%

Effect of image charge on the off-axis transport of intense beams in a small aperture quadrupole lattice

2013

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This paper investigates the first order image charge effects of circular conducting pipe on an intense off-axis continuous charged particle beam propagating through an alternating-gradient focusing channel. The equations of motion for the centroid and envelopes of slightly off-axis beam are derived and used to determine the equilibrium and stability conditions for the beam transport. The envelope oscillation frequencies of the mismatched beam are obtained by the smooth approximation method and by numerical evaluation of the linearly perturbed envelope equations. Depending on the beam intensity and focusing parameters, it is found that the frequency of the out-of-phase mode of envelope oscillation is reduced due to the presence of the conducting wall. Detailed numerical results for off-axis beam transport in a quadrupole lattice are presented and the stable regimes in the parameter space are determined numerically. It is observed that the unstable region for the envelope evolution with image charge effects depends on beam intensity and external focusing strength and increases with the off centering of the beam. V C 2013 AIP Publishing LLC. [http://dx.

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Self-consistent study of space-charge-dominated beams in a misaligned transport system

Cited by 4 publications

References 34 publications

Effect of subdominant species on the evolution of intense primary beam in a low energy beam transport line

Effect of subdominant species on the evolution of intense primary beam in a low energy beam transport line

Transport of intense proton beam in the presence of subdominant species in a low energy beam transport system

Effect of image charge on the off-axis transport of intense beams in a small aperture quadrupole lattice

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