CISP: Simulation Platform for Collective Instabilities in the BRing of HIAF project

Liu, J.; Jiang, Yang; Xia, J.W.; Yin, Da-Yu; Shen, Guodong; Li, P.; Hongwei, Zhao; Ruan, S. N.; Wu, Bo

doi:10.1016/j.nima.2017.10.094

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…In this paper, some dominant impedance sources in the BRing, mainly resistive wall and kickers, are considered and estimated, which leads to a BRing transverse impedance model. Using this impedance model, transverse modecoupling instability, transverse coupled-bunch instability and transverse unbunched beam instability are analyzed by analytical methods or CISP (Simulation Platform for Collective Instabilities) simulations [8]. The results given by different methods agree with each other.…”

Section: Introductionmentioning

confidence: 83%

Transverse impedances and collective instabilities in a heavy ion accelerator

Liu

Jiang

Xia

et al. 2018

Phys. Rev. Accel. Beams

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Evaluation of transverse impedances and collective instabilities is important for determining whether a transverse feedback system or damping schemes should be prepared in the BRing (Booster Ring) at the HIAF (High Intensity Heavy-ion Accelerator Facility). In this paper, some dominant transverse impedances are estimated to build a transverse impedance model of the BRing. With this model, all potential transverse instabilities and their growth times or rates are analyzed by analytical methods or simulations, and the results agree with each other. The growth times of some instabilities are shorter than the duration times of corresponding manipulations, which shows transverse instabilities may have many detrimental impacts on the BRing. To cure the transverse instabilities, a transverse feedback system will be proposed in the design of the BRing. Besides, this paper not only shows the transverse instabilities in the BRing, but also provides the whole method for estimating them in the design of a new accelerator facility.

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Section: Introductionmentioning

confidence: 83%

Transverse impedances and collective instabilities in a heavy ion accelerator

Liu

Jiang

Xia

et al. 2018

Phys. Rev. Accel. Beams

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“…Transverse coupling impedances may stimulate severe transverse collective instabilities near transition. To check whether the proton beam is stable during the 𝛾 𝑡 jump in the BRing, a Vlasov solver DELPHI [6] (Discrete Expansion over Laguerre Polynomials and HeadtaIl modes) from the CERN and a tracking software CISP [7] (Simulation Platform for Collective Instabilities) developed by the IMP are employed to calculate and analyze the instability growth and other beam parameter evolution for the proton beam in a whole acceleration process.…”

Section: Transverse Collective Effectsmentioning

confidence: 99%

Collective effects near transition energy in the proton mode of HIAF/BRing

et al. 2020

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The High Intensity heavy-ion Accelerator Facility (HIAF) is under construction. The lattice of HIAF/BRing is the same for both heavy ion beams and proton beam. Since the proton beam will cross the transition energy during acceleration, a γt jump scheme with maximum Δ γt of 2 is designed to reduce the growth of momentum spread and influence of collective effects near transition. The broadband impedance of the ceramic-lined rings in the vacuum chamber has been significantly reduced by a 2 μm-copper coating. Thus, the impedance model has been updated for analyzing collective effects in the BRing. The longitudinal collective effects can be compensated by the multi-harmonic feedforward system. The transition energy crossing point should be optimized to reduce the bunch oscillations after transitions. In both two transverse planes, the normalized emittance growth given by the Simulation Platform for Collective Instabilities (CISP) are stopped by the broadband impedance near transition and there is no obvious transverse collective instability, which is quite different from the Vlasov results. More researches will be performed to find out the reason.

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“…In this paper, we take 238 U 35+ , which can be accelerated up to roughly 830 MeV/u corresponding to the maximum magnetic rigidity of 34 Tm, as an example to study the longitudinal beam dynamics by theoretical calculation and numerical simulation. e numerical model is given by a scalable multi-macroparticle simulation platform CISP [20], and 10000 macroparticles are applied during the simulation process. In order to quantify the beam properties during the whole processes, several outputs such as energy, momentum, rms emittance, rms bunch length, space charge voltages, bunching factor, and RF amplitude ramps are plotted as a function of time or revolution turn.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Beam Dynamics for the Heavy-Ion Synchrotron Booster Ring at HIAF

et al. 2021

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To accelerate high-intensity heavy-ion beams to high energy in the booster ring (BRing) at the High-Intensity Heavy-Ion Accelerator Facility (HIAF) project, we take the typical reference particle 238U35+, which can be accelerated from an injection energy of 17 MeV/u to the maximal extraction energy of 830 MeV/u, as an example to study the basic processes of longitudinal beam dynamics, including beam capture, acceleration, and bunch merging. The voltage amplitude, the synchronous phase, and the frequency program of the RF system during the operational cycle were given, and the beam properties such as bunch length, momentum spread, longitudinal beam emittance, and beam loss were derived, firstly. Then, the beam properties under different voltage amplitude and synchronous phase errors were also studied, and the results were compared with the cases without any errors. Next, the beam properties with the injection energy fluctuation were also studied. The tolerances of the RF errors and injection energy fluctuation were dictated based on the CISP simulations. Finally, the effect of space charge at the low injection energy with different beam intensities on longitudinal emittance and beam loss was evaluated.

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CISP: Simulation Platform for Collective Instabilities in the BRing of HIAF project

Cited by 5 publications

References 4 publications

Transverse impedances and collective instabilities in a heavy ion accelerator

Transverse impedances and collective instabilities in a heavy ion accelerator

Collective effects near transition energy in the proton mode of HIAF/BRing

Longitudinal Beam Dynamics for the Heavy-Ion Synchrotron Booster Ring at HIAF

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