Axial magnetic field produced by axially and radially magnetized permanent rings

Peng, Quanling; McMurry, S.M.; Coey, J. M. D.

doi:10.1016/s0304-8853(03)00494-3

Cited by 32 publications

(13 citation statements)

References 2 publications

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“…Moreover, a magnetometer is not able to show the distribution of the magnetic field. Peng and co-workers described an analytical method to calculate the magnetic field only for the central axis of an axially magnetized ring (Peng et al 2004), but to our knowledge no analytical methods calculating the distribution of the magnetic field around a magnetic ring exist. Instead of NdFeB, we considered neodymium as the material for the domains of magnetic coupling because it is the strongest magnetic material of the alloy.…”

Section: Discussionmentioning

confidence: 99%

Influence of the static magnetic field on cell response in a miniaturized optically accessible bioreactor for 3D cell culture

Izzo

Tunesi

Boeri

et al. 2019

Biomed Microdevices

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Hydraulic sealing is a crucial condition for the maintenance of sterility during long term operation of microfluidic bioreactors. We developed a miniaturized optically accessible bioreactor (MOAB) allowing perfused culture of 3D cellularised constructs. In the MOAB, the culture chambers are sealed by magnets that generate a weak static magnetic field (SMF). Here, we predicted computationally the exact level of SMF to which cells are subjected during culture in the MOAB and we assessed its influence on the viability, metabolic activity and gene expression of neuroblastoma-derived cells cultured up to seven days. The predicted SMF ranged from 0.32 to 0.57 T using an axial-symmetric model of a single chamber, whereas it ranged from 0.35 to 0.62 T using a 3D model of the complete device. Cell function was evaluated in SH-SY5Y neuroblastoma cells at 2 and 7 days of culture in the MOAB, compared to 2D monolayer, 3D non-perfused constructs, and 3D perfused constructs cultured in a modified MOAB with magnet-free sealing. We measured the cell metabolic activity normalized by the DNA content and the expression levels of heat-shock protein 70 (Hsp-70), Bcl-2 and Bax. We found that the level of SMF applied to cells in the MOAB did not influence their metabolic activity and exerted a stressful effect in 2D monolayer, not confirmed in 3D conditions, neither static not perfused. Instead, the magnets provided a significantly greater hydraulic sealing in long-term culture, thus the MOAB might be potentially exploitable for the development of reliable in vitro models of neurodegeneration. Electronic supplementary material The online version of this article (10.1007/s10544-019-0387-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Influence of the static magnetic field on cell response in a miniaturized optically accessible bioreactor for 3D cell culture

Izzo

Tunesi

Boeri

et al. 2019

Biomed Microdevices

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“…More generally, they can be extended to more layers. For simplify, the residual field from the solenoid coil can be regarded as two thin layers carried with opposite current direction, and can be calculated in the current sheet model, similar as the field from a permanent magnet [6]. Figure 9 shows the residual field calculation model for half length of the solenoid by using OPERA-2D [7].…”

Section: Discussion On the Residual Field From The Solenoidmentioning

confidence: 99%

Field measurement for superconducting magnets of ADS injector I

Yang

Peng

et al. 2014

Chinese Phys. C

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The superconducting solenoid magnet prototype for ADS injection-I had been fabricated in Beijing Qihuan Mechanical and Electric Engineer Company and tested in Haerbin Institute of Technology (HIT) in Nov, 2012. Batch magnet production was processed after some major revision from the magnet prototype, they include: removing off the perm-alloy shield, extending the iron yoke, using thin superconducting cable, etc. The first one of the batch magnets was tested in the vertical Dewar in HIT in Sept. 2013. Field measurement was carried out at the same time by the measurement platform that seated on the top of the vertical Dewar. This paper will present the field measurement system design, measurement results and discussion on the residual field from the persistent current effect.

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“…Along their symmetry axis , we can also analytically estimate the field distribution. The magnetic-field strength of a single axially magnetised ring is given by 37 : with inner radius R i , outer radius R o , and thickness D . We calculate the corresponding field for our magnet assembly by summation of Eq.…”

Section: Methodsmentioning

confidence: 99%

Hybrid setup for stable magnetic fields enabling robust quantum control

Hakelberg

Kiefer

Wittemer

et al. 2018

Sci Rep

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Well controlled and highly stable magnetic fields are desired for a wide range of applications in physical research, including quantum metrology, sensing, information processing, and simulation. Here we introduce a low-cost hybrid assembly of rare-earth magnets and magnetic field coils to generate a field strength of 10.9 mT with a calculated spatial variation of less than 10−6 within a diameter of spherical volume of 150 μm. We characterise its tuneability and stability performance using a single Mg+ atom confined in a radio-frequency surface-electrode trap under ultra-high vacuum conditions. The strength of the field can be tuned with a relative precision of ≤2 × 10−5 and we find a passive temporal stability of our setup of better than 1.0 × 10−4 over the course of one hour. Slow drifts on time scales of a few minutes are actively stabilised by adjusting electric currents in the magnetic field coils. In this way, we observe coherence times of electronic superposition states of greater than six seconds using a first-order field insensitive (clock) transition. In a first application, we demonstrate sensing of magnetic fields with amplitudes of ≥0.2 μT oscillating at 2π × 60 MHz. Our approach can be implemented in compact and robust applications with strict power and load requirements.

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Axial magnetic field produced by axially and radially magnetized permanent rings

Cited by 32 publications

References 2 publications

Influence of the static magnetic field on cell response in a miniaturized optically accessible bioreactor for 3D cell culture

Influence of the static magnetic field on cell response in a miniaturized optically accessible bioreactor for 3D cell culture

Field measurement for superconducting magnets of ADS injector I

Hybrid setup for stable magnetic fields enabling robust quantum control

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