An improved permanent magnet quadrupole design with larger good field region for high intensity proton linacs

Mathew, Jose V.; Rao, S.V.L.S.; Krishnagopal, S.; Singh, P.

doi:10.1016/j.nima.2013.05.142

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…The idea of combining permanent magnets and electromagnetic fields into a single hybrid magnet is not new [32][33][34]. Our design uses a novel combination of four wedge-shaped iron cores, copper coil windings, and an array of permanent magnets.…”

Section: A Hybrid Designmentioning

confidence: 99%

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Permanent-magnet quadrupoles for an interdigital H -mode drift tube linear accelerator: Optimization code and adjustable magnet design

Easton

et al. 2018

Phys. Rev. Accel. Beams

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Magnets to be used for the internal quadrupoles of an interdigital H-mode drift tube linear accelerator (IH-DTL) using KONUS beam dynamics should be both compact in size and high in focusing field gradient. Permanent magnets are an attractive solution, but then the ability to adjust the field strength is lost. We investigated two different solutions to this problem: the first using external adjustable electromagnets; the second using internal adjustable permanent magnets. The first method moves the variability out of the resonant cavity, using adjustable electromagnet quadrupole doublets before entry into the IH-DTL to compensate for the lack of internal variability. We carried out optimization simulations with custom code that ran many instances of the LORASR beam dynamics simulation software, using different values of field strength for the external doublets. By optimizing the magnet settings for different values of input current, we were able to compensate for the space-charge forces involved in accelerating a high-intensity continuous-wave (CW) deuteron beam. Second, we designed some novel adjustable permanent-magnet quadrupoles to be used inside the cavity, which combine the advantages of small cross-section and variable field gradient. This allows much more control over the beam, and even other ion species with differing charge-to-mass ratios can be accommodated within the same accelerator design. We developed two adjustable permanent-magnet designs: one with an electromagnetic component, and the other with two concentric moving rings of Halbach-array quadrupoles.

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Section: A Hybrid Designmentioning

confidence: 99%

“…We optimized the quality of the field by minimizing the deviation of the field gradient GðrÞ, that is, minimizing the objective function [34]:…”

Section: A Hybrid Designmentioning

confidence: 99%

Permanent-magnet quadrupoles for an interdigital H -mode drift tube linear accelerator: Optimization code and adjustable magnet design

Easton

et al. 2018

Phys. Rev. Accel. Beams

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“…The RADIA magnet simulation software is used for the field computation. The RADIA software was developed in the ESRF Insertion Device lab and has been largely used for undulator, wiggler and multipole magnet design [6][7][8][9][10][11]. This software does not rely on a finite element method as most of the field computation codes do, but on a boundary integral method.…”

Section: A Simulation Toolsmentioning

confidence: 99%

“…The accuracy of the pole shape and the magnet assembly is technologically limited. Equations (8) and (9) show that for a given production technology, high gradient, low aperture quadrupoles are subject to higher multipole content than moderate gradient magnets.…”

Section: B Scale Factors and Preliminary Designmentioning

confidence: 99%

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High gradient quadrupoles for low emittance storage rings

Bec

Chavanne

Benabderrahmane

et al. 2016

Phys. Rev. Accel. Beams

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High gradient quadrupoles are key components for the coming generation of storage ring based light sources. The typical specifications of these magnets are: almost 100 T=m gradient, half a meter long, and a vertical aperture for the extraction of the x-ray beam. This paper presents the preparation work done at the European Synchrotron Radiation Facility, from the design to the manufacture and measurements of a prototype. It demonstrates the feasibility of such magnets. Different aspects of magnet engineering are discussed, including the study of the main scale factors and the preliminary design, the pole shaping, the impact of mechanical errors, and the magnetic measurements of a prototype with a stretched-wire system.

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Design and development of a focusing electromagnet for RF linac of a cargo scanner

Nayak

Acharya

Bhattacharjee

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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An improved permanent magnet quadrupole design with larger good field region for high intensity proton linacs

Cited by 8 publications

References 20 publications

Permanent-magnet quadrupoles for an interdigital H -mode drift tube linear accelerator: Optimization code and adjustable magnet design

Permanent-magnet quadrupoles for an interdigital H -mode drift tube linear accelerator: Optimization code and adjustable magnet design

High gradient quadrupoles for low emittance storage rings

Design and development of a focusing electromagnet for RF linac of a cargo scanner

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