ORBIT: A Code for Collective Beam Dynamics in High-Intensity Rings

Holmes, Jeffrey; Danilov, V.; Galambos, J.; Shishlo, A.; Cousineau, S.; Chou, W.; Michelotti, L.; Ostiguy, J.‐F.; Wei, Julia

doi:10.1063/1.1522636

Cited by 5 publications

(4 citation statements)

References 4 publications

(3 reference statements)

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“…Objective Ring Beam Injection and Tracking (ORBIT) [8] is used for particle tracking in these simulations. ORBIT is a 3D particle tracking code which can be used to simulate the injection and acceleration process of the RCS.…”

Section: Simulation Resultsmentioning

confidence: 99%

Optimizing the RF cavity parameters at CSNS-II with Particle Swarm Optimization

Qiu

et al. 2017

Radiat Detect Technol Methods

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Objective This study is aimed at optimizing the parameters of a dual-harmonic RF system which will be used in CSNS-II to have a larger bunching factor and less particle losing to decrease the space charge effect. Methods By studying the synchrotron equation of motion in a double RF system, some features of the bunch are quantized. The normalized bucket area should be constant, the injection condition should be satisfied, and larger bunching factor is preferred during the cycle period. With these ideas, three objective functions are proposed. Particle swarm optimization (PSO) method is employed to search the optimal solution. Results There is less particle loss in the simulation with the optimized parameters. The growth rate of the transverse emittance is smaller after the optimization. The bunch can keep a larger bunching factor which is very useful to decrease the space charge force. Conclusion The parameters of the dual-harmonic RF system are optimized with swarm optimization method. This study provides a general method to optimize the similar system, especially for an accelerator.

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Section: Simulation Resultsmentioning

confidence: 99%

Optimizing the RF cavity parameters at CSNS-II with Particle Swarm Optimization

Qiu

et al. 2017

Radiat Detect Technol Methods

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“…A successful simulation of the injection of a 2D selfconsistent rotating distribution as a coasting beam, including space charge, into a linearized SNS lattice was conducted using the ORBIT code [12] and presented in Ref. [9].…”

Section: Realistic Simulations Of Rotating Self-consistent Beamsmentioning

confidence: 99%

Injection of a self-consistent beam with linear space charge force into a ring

Holmes

Gorlov

Evans

et al. 2018

Phys. Rev. Accel. Beams

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One major concern in the design and operation of high-intensity rings is beam loss due to beam halo. Another issue of importance in applications involving fixed targets is the uniformity of the beam energy deposition on the target. Both of these issues could be favorably addressed by a hard-edged beam with uniform transverse density. This paper presents a detailed feasibility study for painting such a beam into a high-intensity proton ring. For the purposes of this paper, we define self-consistent beams to be ellipsoidal, or elliptical in 2D, distributions that have uniform density and linear space charge force and that retain these properties under all linear transformations. Because of their linear space charge forces and linear transport properties, self-consistent distributions may undergo very little halo formation if realized in practice. Because of their uniform density, they would have smaller maximum space charge tune shifts than peaked density distributions, and they would be attractive for high-intensity fixed target applications. Selfconsistent distributions involve very special relationships between the phase space coordinates, making them singular in some respects and difficult to realize experimentally. The most famous self-consistent distribution is the Kapchinsky-Vladimirsky distribution, but now many other self-consistent distributions have been discovered. One such, the 2D rotating distribution, can be painted as a coasting beam into a ring having an appropriately designed and tuned lattice. For bunched beams, if the bunch length is sufficiently long, it is expected that the coasting beam assumption will be a good approximation during painting. However, it is unknown how robust self-consistent distributions will be under real world transport in the presence of nonlinearities and collective effects. This paper studies these issues for a particular case of interest by applying realistic detailed computational models to the simulation of painting a self-consistent rotating beam into the Spallation Neutron Source (SNS) ring. As a result, we propose a case that can be carried out with only a minor modification of the SNS hardware.

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“…In Section III, we discuss the lattices under consideration and discuss the correct beam matching for them. We used the PyORBIT Python-wrapped version of the ORBIT tracking code [8][9][10][11] to carry out these simulations, and give a brief overview in Section IV. The effects of nonlinear decoherence on the breathing modes generated by a beta mismatch in the beam is discussed in Section V, while in Section VI we demonstrate that the results in the previous sections lead to the prevention of halo formation by a mechanism discussed in [12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nonlinear Decoherence on Halo Formation

Webb¹,

Bruhwiler²,

Abell³

et al. 2012

Preprint

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High intensity proton linacs and storage rings are central for the development of advanced neutron sources, extending the intensity frontier in high energy physics, as drivers for the production of pions in neutrino factories or muon colliders, and for the transmutation of radioactive waste. Such high intensity beams are not attainable using conventional linear lattices. It has been shown in the single particle limit that integrable nonlinear lattices permit much larger tune spreads than conventional linear lattices, which would mitigate many of the space charge restrictions that limit intensity. In this paper, we present numerical studies of space charge effects on a trial nonlinear lattice with intense bunches. We observe that these nonlinear lattices and their accompanying tune spreads strongly mitigate halo formation using a result from the particle-core model known to cause halo formation in linear lattices.

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ORBIT: A Code for Collective Beam Dynamics in High-Intensity Rings

Cited by 5 publications

References 4 publications

Optimizing the RF cavity parameters at CSNS-II with Particle Swarm Optimization

Optimizing the RF cavity parameters at CSNS-II with Particle Swarm Optimization

Injection of a self-consistent beam with linear space charge force into a ring

Effects of Nonlinear Decoherence on Halo Formation

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