Time resolving diagnostic of the compensation process of pulsed ion beams at high-intensity light ion source

Jakob, A.; Beauvais, P-Y.; Gobin, R.; Klein, H.; Lemaire, J. L.; Leroy, P.; Pozimski, J.

doi:10.1063/1.1150398

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…Analytical and experimental studies [2 -4] show that the beam charge in a low energy beam transport line is not always fully neutralized. Several studies have also recorded that the SCC depends on time [5,6]. These conditions complicate considerably the beam dynamics in a space charge compensation regime.…”

Section: Introductionmentioning

confidence: 99%

Space charge compensation studies of hydrogen ion beams in a drift section

Ben-Ismaïl

Duperrier

Uriot

et al. 2007

Phys. Rev. ST Accel. Beams

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Demands of high intensity beams are increasing for material science and engineering applications. To control the high intensity beam dynamics, the nonlinear space charge forces, produced by the beam and the residual plasma at low energy, have to be carefully studied. Interactions between the beam and the residual gas tend to neutralize the beam space charge. The temporal and spatial evolutions of these interactions complicate the beam dynamics, even into a drift section. A 1.5D (xy for motion, r for space charge) PIC code, CARTAGO, has been written in order to simulate the beam dynamics in a low energy beam transport line including the space charge compensation effects. This paper relates the structure and the numerical methods used in the code and shows studies of the space charge compensation regime for H and H ÿ beams in a drift section.

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Section: Introductionmentioning

confidence: 99%

Space charge compensation studies of hydrogen ion beams in a drift section

Ben-Ismaïl

Duperrier

Uriot

et al. 2007

Phys. Rev. ST Accel. Beams

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“…In this frame, we seek for the stationary states of the plasma, for it is shown experimentally that the plasma reaches a state of equilibrium for such continuous beams. 9 The derivation of this model is given in Ref. 7, it is also summarized in Ref.…”

Section: Introductionmentioning

confidence: 99%

An Existence Result for a Stationary Vlasov–Poisson Model with Source Term

Ambroso

Fleury

Raviart

2003

Math. Models Methods Appl. Sci.

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In the low energy part of an ion accelerator, the ion beam reaches the first accelerating device through a drift tube where a residual neutral gas is present. A process of ionization takes place and secondary electrons and ions are created. We analyze the coupling between these secondary particles, the beam density and the electrical potential.In a previous article, 2 we proved that a stationary Vlasov-Poisson problem with ionization source terms, which, at first sight, seems the natural model for this system, does not admit solutions. To overcome this difficulty, we propose here a heuristic model which consists of modifying the electron source term. In this new frame, we prove that the problem can be solved and we give numerical examples.

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“…Therefore, in contrary to electrostatic focussing systems and uncompensated transport, a magnetic LEBT system suffers from time dependent space charge forces even for flat top beam pulses. To study the compensation process different diagnostic tools have been developed [2,3,4]. Therefore the residual gas ions (RGI) produced and expelled radially by the self field of the beam can be used.…”

Section: Introductionmentioning

confidence: 99%

A relaxation model to describe the space charge compensation process for pulsed ion beams reproducing RGI-spectrometer measurements

Jakob

Pozimski²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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In magnetic low energy beam transport (LEBT) sections space charge compensation facilitates the transport of high current beams and reduces emittance growth due to space charge forces. For the transport of pulsed beams, the knowledge of the time necessary to establish space charge compensation (rise time) using the process of residual gas ionisation for the production of compensation particles, is important. To investigate the rise time of space charge compensation time resolved measurements of the beam potential have been performed using a residual gas ion energy analyser (RGIEA). Comparisons between the measured data and the simple model of constant particle capture showed significant deviations. To reproduce the measurements a simplified mathematical description of the temporal potential development was developed and will be presented. It can be used for on-line determination of several factors affecting the rise time and the compensation degree. The calculations of the time dependent potentials will be compared with measurements.

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Time resolving diagnostic of the compensation process of pulsed ion beams at high-intensity light ion source

Cited by 3 publications

References 1 publication

Space charge compensation studies of hydrogen ion beams in a drift section

Space charge compensation studies of hydrogen ion beams in a drift section

An Existence Result for a Stationary Vlasov–Poisson Model with Source Term

A relaxation model to describe the space charge compensation process for pulsed ion beams reproducing RGI-spectrometer measurements

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