Dynamics of the IFMIF very high-intensity beam

Nghiem, P.; Chauvin, Nicolas; Comunian, M.; Delferrière, O.; Duperrier, R.; Mosnier, A.; Oliver, C.; Simeoni, W.; Uriot, D.

doi:10.1017/s0263034613001055

Cited by 14 publications

(14 citation statements)

References 8 publications

(8 reference statements)

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“…Tolerance values, including static and dynamic ones, are discussed and presented in Chauvin et al (2011) and Nghiem et al (2011;2014). We must however expect that the real beam behavior is not exactly the same as theoretically simulated (the IFMIF very high space charge regime has never been experimentally observed).…”

Section: Starting From Scratchmentioning

confidence: 92%

A catalogue of losses for a high power, high intensity accelerator

et al. 2014

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For a Megawatt class accelerator, classical safety measures may not be sufficient. Precise knowledge of beam loss location and power deposition in the most various scenarios is crucial for the definition of appropriate protection systems. In this work, the case of the Linear IFMIF Prototype Accelerator is studied, where, due to its very high continuous wave beam intensity, the high power part concerns almost the whole accelerator. Beam dynamics simulations are performed to allow the ability to estimate beam losses in all the different situations of the accelerator lifetime: starting from scratch, beam commissioning, tuning or exploration, routine operation, sudden failures. All the results of these studies are given, establishing the catalogue of losses. Recommendations for hot point protection, beam stop speed, beam power limitation are given accordingly.

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Section: Starting From Scratchmentioning

confidence: 92%

A catalogue of losses for a high power, high intensity accelerator

et al. 2014

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“…Applications of the two graphs discussed here to some high intensity accelerators, achieved, under construction or planned, are shown in Figure 3 (Nghiem et al, 2011a). Similar graphs but representing peak power or energy instead, may be useful for accelerators with very high instantaneous beam power like intense heavy ion accelerators for inertial fusion purposes or for beam-plasma physics (Bangerter et al, 2013;Hoffmann et al, 2005).…”

Section: Beam Analysismentioning

confidence: 98%

“…This multi-parameter optimization is time consuming. As an exercise, an alternative tuning has been obtained by applying in the second part of the structure the classical method of minimizing emittance growth consisting in avoiding the transverse-longitudinal coupling resonance (Nghiem et al, 2014a). A specific code has been written for that, using the particle swarm optimization procedure (Kennedy & Eberhart, 1995), suitable for searching the lowest minimum of an n-Dimension surface having several local minimums.…”

Section: Beam Optimizationmentioning

confidence: 99%

Advanced concepts and methods for very high intensity accelerators

et al. 2014

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For very high intensity accelerators, not only beam power but also space charge is a concern. Both aspects should be taken into consideration for any analysis of accelerators aiming at comparing their performances and pointing out the challenging sections. As high beam power is an issue from the lowest energy, careful and exhaustive beam loss predictions have to be done. High space charge implies lattice compactness making the implementation of beam diagnostics very problematic, so a clear strategy for beam diagnostic has to be defined. Beam halo is no longer negligible. Its dynamics is different from that of the core and plays a significant role in the particle loss process. Therefore, beam optimization must take the halo into account and beam characterization must be able to describe the halo part in addition to the core one. This paper presents the advanced concepts and methods for beam analysis, beam loss prediction, beam optimization, beam diagnostic, and beam characterization especially dedicated to very high intensity accelerators. Examples of application of these concepts are given in the case of the IFMIF accelerators.

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“…In order to reduce the beam loss, the idea of halo-matching was carefully studied recently [14], other than the experimental core-matching studies in the rms sense such as Ref. [15].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the fourth order resonance in high intensity linear accelerators

Jeon

Hwang

2017

Physics of Plasmas

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For the 4= 360° space-charge resonance in high intensity linear accelerators, the emittance growth is surveyed for input Gaussian beams, as a function of the depressed phase advance per cell  and the initial tune depression ( o  ). For each data point, the linac lattice is designed such that the fourth order resonance dominates over the envelope instability. The data show that the maximum emittance growth takes place at   87° over a wide range of the tune depression (or beam current), which confirms that the relevant parameter for the emittance growth is  and that for the bandwidth is. An interesting four-fold phase space structure is observed that cannot be explained with the fourth order resonance terms alone. Analysis attributes this effect to a small negative sixth order detuning term as the beam is redistributed by the resonance. Analytical studies show that the tune increases monotonically for the Gaussian beam which prevents the resonance for  > 90. Frequency analysis indicates that the four-fold structure observed for input KV beams when  < 90 is not the fourth order resonance but a fourth order envelope instability because the 1/4 = 90/360 component is missing in the frequency spectrum.

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Dynamics of the IFMIF very high-intensity beam

Cited by 14 publications

References 8 publications

A catalogue of losses for a high power, high intensity accelerator

A catalogue of losses for a high power, high intensity accelerator

Advanced concepts and methods for very high intensity accelerators

Characteristics of the fourth order resonance in high intensity linear accelerators

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