Zgoubi users guide

Méot, F.

doi:10.2172/1054191

Cited by 10 publications

(5 citation statements)

References 21 publications

(15 reference statements)

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“…In a next phase more realistic simulations have been performed by 3D particle tracking in Magnetic fields, which have been calculated using extrapolations from a very simple magnet model (see figure 5). Using POISSON SUPERFISH (Menzel and Stokes 1987) and ZGOUBI (Meot 2012), a 3D map of the magnetic field has been generated. This method ensured us to obtain realistically shaped magnetic fields that obey Maxwell's equations.…”

Section: Magnetic Field Mapmentioning

confidence: 99%

A static beam delivery device for fast scanning proton arc-therapy

et al. 2021

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Arc-therapy is a dose delivery technique regularly applied in photon radiation therapy, and is currently subject of great interest for proton therapy as well. In this technique, proton beams are aimed at a tumor from different continuous ranges of incident directions (so called ‘arcs’). This technique can potentially yield a better dose conformity around the tumor and a very low dose in the surrounding healthy tissue. Currently, proton-arc therapy is performed by rotating a proton gantry around the patient, adapting the normally used dose-delivery method to the arc-specific motion of the gantry. Here we present first results from a feasibility study of the conceptual design of a new static fast beam delivery device/system for proton-arc therapy, which could be used instead of a gantry. In this novel concept, the incident angle of proton beams can be set rapidly by only changing field strengths of small magnets. This device eliminates the motion of the heavy gantry and related hardware. Therefore, a reduction of the total treatment time is expected. In the feasibility study presented here, we concentrate on the concept of the beam transport. Based on several simple, but realistic assumptions and approximations, proton tracking calculations were performed in a 3D magnetic field map, to calculate the beam transport in this device and to investigate and address several beam-optics challenges. We propose and simulate corresponding solutions and discuss their outcomes. To enable the implementation of some usually applied techniques in proton therapy, such as pencil beam scanning, energy modulation and beam shaping, we present and discuss our proposals. Here we present the concept of a new idea to perform fast proton arc-scanning and we report on first results of a feasibility study. Based on these results, we propose several options and next steps in the design.

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Section: Magnetic Field Mapmentioning

confidence: 99%

A static beam delivery device for fast scanning proton arc-therapy

et al. 2021

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“…A detailed investigation of the acceptance of the spectrometer has been reported in our earlier work where it was shown that the transmission of the particles through VAMOS is non-uniform and varies within the accepted range of angles and momenta [2]. The study of the transmission was performed by tracing the particles through the magnetic fields using the ion optical code ZGOUBI [16] (the various physical constraints imposed by the apertures of the magnets and detector windows are incorporated into the Figure 2. Two dimensional plot of θ as function of relative rigidity for transmitted particles for two positions of the existing detection system (400 mm × 110 mm).…”

Section: Limitation In the Acceptance And Need For A Larger Area Detementioning

confidence: 99%

Performance of the improved larger acceptance spectrometer: VAMOS++

Rejmund

Lecornu

Navin

et al. 2011

Nuclear Instruments and Methods in Physics Research Section A:

131

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International audienceMeasurements and ion optic calculations showed that the large momentum acceptance of the VAMOS spectrometer at GANIL could be further increased from $\sim$ 11% to $\sim$ 30% by suitably enlarging the dimensions of the detectors used at the focal plane. Such a new detection system built for the focal plane of VAMOS is described. It consists of larger area detectors (1000 mm × 150 mm) namely, a Multi-Wire Parallel Plate Avalanche Counter (MWPPAC), two drift chambers, a segmented ionization chamber and an array of Si detectors. Compared to the earlier existing system (VAMOS), we show that the new system (VAMOS++) has a dispersion-independent momentum acceptance . Additionally a start detector (MWPPAC) has been introduced near the target to further improve the mass resolution to $\sim$ 1/220. The performance of the VAMOS++ spectrometer is demonstrated using measurements of residues formed in the collisions of 129Xe at 967 MeV on 197Au

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“…Different methods of field expansion out of a 2D plane have been used in particle tracking codes. For example, Zgoubi [5] uses Taylor expansion with curl and divergence of the magnetic field being zero in cartesian coordinates.…”

Section: Introductionmentioning

confidence: 99%

Redundant field survey data of cyclotron with imperfect median plane

Zhang

Rao

2023

J. Inst.

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An accurate and detailed field map is important for cyclotron beam dynamics studies. During the long history of cyclotron studies, many techniques have been developed by cyclotron pioneers for the treatment of median plane field map. In this paper, we take the TRIUMF 500 MeV cyclotron as an example to study the asymmetric field resulting from imperfect median plane symmetry. The “Gordon approach” and a highly accurate compact finite differentiation method are used to investigate the historical field survey data. The redundancy in the survey data is revealed by the expansion method, which also makes it possible to correct the error in the measurement. Finally, both the azimuthal field Bθ and the axial gradient of the axial field dBz /dz in the median plane are corrected using the radial field map Br . The influence of the correction is examined by recalculating the equilibrium orbit properties of the TRIUMF cyclotron. The result shows significantly increased vertical centering errors of the closed orbits. A further simulation study suggests that these centering errors can be reduced to below 1.5 cm by adjusting the trim coils' Br field within the output limits of our trim coils' power supplies. The error in the measurement field data may explain why the calculated trim coils' settings during the cyclotron commissioning in 1974 encountered difficulty.

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Zgoubi users guide

Cited by 10 publications

References 21 publications

A static beam delivery device for fast scanning proton arc-therapy

A static beam delivery device for fast scanning proton arc-therapy

Performance of the improved larger acceptance spectrometer: VAMOS++

Redundant field survey data of cyclotron with imperfect median plane

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