Design, Manufacture and Measurements of Permanent Quadrupole Magnets for Linac4

Tommasini, D.; Buzio, Marco; Thonet, Pierre; Vorozhtsov, A.S.

doi:10.1109/tasc.2011.2179391

Cited by 12 publications

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“…Properties of water cooling circuits are provided in Table 8. 3 Finally, we remark that coils are submitted to forces: their own weight and the electromagnetic forces produced by the interaction between magnetic field and current. Cooling flow 1 kcal = 4186 J increases the temperature of 1 kg of water by 1 • C. Q is the cooling flow, P the dissipated power, T the allowed temperature drop increase Q liter min ∼ 14.3 P [kW] ΔT [K] Water velocity Q = vA, where Q is the flow, v the water velocity and A the section of the pipe.…”

Section: Coilsmentioning

confidence: 99%

Accelerator Engineering and Technology: Accelerator Technology

Bordry

Bottura

Milanese

et al. 2020

Particle Physics Reference Library

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Magnets are at the core of both circular and linear accelerators. The main function of a magnet is to guide the charged particle beam by virtue of the Lorentz force, given by the following expression: F = q v × B, (8.1) where q is the electrical charge of the particle, v its velocity, and B the magnetic field induction. The trajectory of a particle in the field depends hence on the particle Coordinated by F. Bordry

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Section: Coilsmentioning

confidence: 99%

Accelerator Engineering and Technology: Accelerator Technology

Bordry

Bottura

Milanese

et al. 2020

Particle Physics Reference Library

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“…Therefore, by varying the current in the correction coils and the position of the end tubes, the integrated field strength can be tuned to a considerable amount. The movement of the end tube is simpler compared to the movement of the magnet blocks or the magnet poles, reported earlier [12,13]. The advantages of this scheme are that it is easy to implement, the magnetic axis will not shift, and it will prevent interference with nearby devices by restricting the fringe field.…”

Section: Introductionmentioning

confidence: 98%

“…A compact QP with a field tunability of 20% for the cellcoupled drift tube linac for Linac 4 at CERN was reported in Ref. [13]. The typical length, bore radius, and integrated QP field strength were 140 mm, 22.5 mm, and 1.6 T, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Conceptual design of a compact high gradient quadrupole magnet of varying strength using permanent magnets

Sinha

2018

Phys. Rev. Accel. Beams

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A concept is presented to design magnets using cylindrical-shaped permanent-magnet blocks, where various types of magnetic fields can be produced by either rotating or varying the size of the magnetic blocks within a given mechanical structure. A general method is introduced to calculate the 3D magnetic field produced by a set of permanent magnets. An analytical expression of the 2D field and the condition to generate various magnetic fields like dipole, quadrupole, and sextupole are derived. Using the 2D result as a starting point, a computer code is developed to get the optimum orientation of the magnets to obtain the user-specific target field profile over a given volume in 3D. Designs of two quadrupole magnets are presented, one using 12 and the other using 24 permanent-magnet blocks. Variation of the quadrupole strength is achieved using tuning coils of a suitable current density and specially designed end tubes. A new concept is introduced to reduce the integrated quadrupole field strength by inserting two hollow cylindrical tubes made of iron, one at each end. This will not affect the field gradient at the center but reduce the integrated field strength by shielding the magnetic field near the ends where the tubes are inserted. The advantages of this scheme are that it is easy to implement, the magnetic axis will not shift, and it will prevent interference with nearby devices. Around 40% integrated field variation is achieved using this method in the present example. To get a realistic estimation of the field quality, a complete 3D model using a nonlinear B-H curve is also studied using a finite-element-based computer code. An example to generate around an 80 T/m quadrupole field gradient is also presented.

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“…Several permanent magnet quadrupoles have been designed and built previously [3]- [9]. Often these have been fixed gradient magnets or magnets with only small adjustability.…”

Section: Introductionmentioning

confidence: 99%

Novel Tunable Permanent Magnet Quadrupoles for the CLIC Drive Beam

Clarke

Collomb

Shepherd

et al. 2014

IEEE Trans. Appl. Supercond.

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Two novel designs have been generated for permanent magnet-based quadrupoles for the Compact Linear Collider (CLIC) drive beam. The advantages of reduced heat load in the accelerator tunnel and very low operating costs over conventional electromagnets are significant to the project, hence the motivation for developing these designs. The drive beam lattice requirements can be met using two magnet designs. The higher strength design, which reaches over 60 T/m, has been successfully prototyped, and this paper will report on the measured mechanical and magnetic performance of this magnet. The lower strength design (over 43 T/m) is complete, and a prototype magnet is now being assembled at Daresbury Laboratory. The design of this magnet will be described in detail in the paper.

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Design, Manufacture and Measurements of Permanent Quadrupole Magnets for Linac4

Cited by 12 publications

References 0 publications

Accelerator Engineering and Technology: Accelerator Technology

Accelerator Engineering and Technology: Accelerator Technology

Conceptual design of a compact high gradient quadrupole magnet of varying strength using permanent magnets

Novel Tunable Permanent Magnet Quadrupoles for the CLIC Drive Beam

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