SNS injection simulations with space charge

Galambos, J.; Данилов, С. В.; Jeon, D.; Holmes, Jeffrey; Olsen, D.K.

doi:10.1109/pac.1999.792229

Cited by 7 publications

(7 citation statements)

References 1 publication

(2 reference statements)

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“…The discussion includes not only the physics that forms the basis of our PIC model, but also the generalization of the envelope equations to include bending effects in order to provide a PCM for rings. Section III discusses the numerical methods and convergence of our implementation of these models in our particle-tracking computer code, ORBIT [5]. We alternatively utilize a modified version of the particle tracking and injection computer code, ACCSIM [6], in our calculations.…”

Section: Introductionmentioning

confidence: 99%

Space charge dynamics in high intensity rings

Holmes

Danilov

Galambos

et al. 1999

Phys. Rev. ST Accel. Beams

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Uncontrolled beam losses due to space-charge-induced halo generation are a concern in high intensity rings, which are characterized by high beam intensities and low uncontrolled beam loss requirements. It is therefore important to investigate the dynamics of space charge in high intensity rings. We report here the results of extensive calculations using a particle-tracking approach with a self-consistent particle-in-cell model and alternatively with a particle core model. We find that the inclusion of space charge forces provides agreement between calculated and experimentally observed beam profile shapes in the high intensity proton storage ring. We also confirm computationally the extension to rings of the accepted dynamics of halo generation with rms beam mismatch exciting the parametric resonance. In addition, we propose a new two-stage mechanism for halo production in rings in which space-chargedriven lattice resonances generate beam mismatch that excites the parametric resonance. Because of its dependence on lattice resonances, this mechanism is peculiar to rings and is capable of generating halo even from initially matched beams. It is also very sensitive to the operating point in tune space, as we show in the results of a vertical tune scan simulating injection into the Spallation Neutron Source accumulator ring. Our results extend and enhance the understanding of fundamental space charge physics, which has been developed for linear accelerators, to rings.

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Section: Introductionmentioning

confidence: 99%

Space charge dynamics in high intensity rings

Holmes

Danilov

Galambos

et al. 1999

Phys. Rev. ST Accel. Beams

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“…In this section the simulation results, especially by applying the modified TP are presented. The simulations were done by using ORBIT 3D code for the RCS design beam power of 1 MW [16]. The ORBIT code has been well adopted for J-PARC RCS beam simulations by incorporating all realistic machine parameters and it has been demonstrated to well reproduce the measurements [14].…”

Section: Numerical Simulation Resultsmentioning

confidence: 99%

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

Saha,

Harada,

Shobuda

et al. 2024

J. Phys.: Conf. Ser.

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The 3-GeV RCS (Rapid Cycling Synchrotron) of J-PARC (Japan Proton Accelerator Research Complex) at present operates at a high intensity beam near to 1 MW beam power. The beam loss and the corresponding residual radiation are key issues for beam intensity ramp up. Based on detail numerical simulations and systematic beam studies the beam loss has been well mitigated to a minimum level. The residual beam loss at 1 MW beam power is mostly due to unavoidable foil scattering of the circulating beam during injection. We have identified almost all major beam loss sources and optimized to minimize the beam loss for achieving a stable operation at 800 kW beam power since April 2022.

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“…Those magnets traverse a painting orbit during injection [14]. A painting injection method is an ordinary way to reduce the space charge effect in a synchrotron [15][16][17][18]. The voltage of the power supply was increased by about twice according to increment of the Linac acceleration energy.…”

Section: Rcsmentioning

confidence: 99%

Path to 1-MW at J-PARC Rapid Cycling Synchrotron

Yamamoto¹,

Yamamoto²,

Morishita³

et al. 2017

ujpa

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The accelerator system at Japan Proton Accelerator Research Complex (J-PARC) has been operational since May 2008 and has mainly been used to perform physics experiments. The accelerator system consists of a Linac, a Rapid Cycling Synchrotron (RCS), and a Main Ring Synchrotron. The originally designed RCS injection energy is 400MeV, but the first operation started at 181MeV. New acceleration cavities were installed in J-PARC Linac during the summer shutdown of 2013, and user operation by the Material and Life science Facility (MLF) at the injection energy of 400MeV was started from February 2014. Post beam commissioning of 400MeV injection energy, beam loss was small enough, and we established 300kW continuous operation. Subsequently, the peak current of the Linac was increased from 30mA to 50mA. This upgrade enabled us to try 1-MW beam acceleration. Finally, after some additional improvements, we successfully accelerated 1-MW equivalent protons.

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SNS injection simulations with space charge

Cited by 7 publications

References 1 publication

Space charge dynamics in high intensity rings

Space charge dynamics in high intensity rings

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

Path to 1-MW at J-PARC Rapid Cycling Synchrotron

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