A magnetic field cloak for charged particle beams

Capobianco-Hogan, Kyle; Cervantes, R.; Deshpande, A.; Feege, N.; Krahulik, T.; LaBounty, J.; Sekelsky, Rourke; Adhyatman, Alexander; Arrowsmith-Kron, Gordon; Coe, Benjamin J.; Dehmelt, K.; Hemmick, T. K.; Jeffas, Sean; Mahmud, S.; Oliveira, Alisson Macário de; Quadri, A.; Sharma, K. K.; Tishelman-Charny, A.

doi:10.1016/j.nima.2017.09.034

Cited by 17 publications

(13 citation statements)

References 15 publications

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“…Stimulating prospects have also been opened recently by making so-called "magnetic cloaks", a variant of magnetic shield in which flux density lines outside the cloak are not perturbed [15], that are based partially on bulk melt-cast Bi-2212 [16]. Passive magnetic shields and cloaks operating at high applied magnetic fields are particularly suited for applications involving particle beams [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of the thermal conductivity of bulk melt-cast Bi-2212 superconducting tubes

Szewczyk¹,

Stachowiak²,

Mucha³

et al. 2020

Supercond. Sci. Technol.

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We investigate experimentally the anisotropy of the temperature dependence of the thermal conductivity of bulk Bi2Sr2CaCu2O8 (Bi-2212) cylinders fabricated by the melt-cast process. The thermal conductivity κ(T) along the axial and azimuthal directions are found to be equal within experimental uncertainty, while κ along the radial direction is found to be ~ 40% larger than the other two. The results are in qualitative agreement with the weak partial texture of such tubes, corresponding also to an anisotropy of the resistivity ρ(T) above the critical temperature Tc. This resistivity anisotropy in the normal state is responsible for an anisotropy of the electronic contribution of thermal conductivity (∆κe), which is much smaller than the anisotropy ∆κ of the total thermal conductivity. This indicates an anisotropic contribution of the phonons. The temperature dependence of the specific heat C(T) is also measured and shows that C(T)/T exhibits a well-defined maximum close to Tc. The combination of these experimental data can be used for assessing the thermal effects in bulk melt-cast Bi-2212, and underline the importance of taking the anisotropy of κ into account, e.g. for predicting the self-heating when the material is subjected to losses.

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Section: Introductionmentioning

confidence: 99%

Anisotropy of the thermal conductivity of bulk melt-cast Bi-2212 superconducting tubes

Szewczyk¹,

Stachowiak²,

Mucha³

et al. 2020

Supercond. Sci. Technol.

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“…A possible alternative might be the use of transformation optics for developing meta- materials and maybe use only room-temperature materials. The work and results described in these proceedings can be seen more detailed in [5].…”

Section: Resultsmentioning

confidence: 99%

Shielding Charged Particle Beams

Dehmelt¹

2020

Proceedings of the 18th International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2019)

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Momentum measurements in the forward direction at collider experiments are inherently difficult as the deflection of charged particles to be observed requires a magnetic field component that is perpendicular to the propagation direction of those particles. This, in turn, would jeopardize the quality of the colliding beam particles. To overcome this difficulty we propose a magnetic cloak that is passively shielding the beam particles from any transverse magnetic field component and furthermore, maintain the character of the magnetic field. This would allow introducing dipole magnets in the forward region of any experiment at a collider, for instance, the Electron-Ion Collider. We present a possible setup and show the design parameters, fabrication, and limitations of a magnetic field cloak.

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“…Potentially, this use of superconducting shells to manage local fields could have a variety of applications, such as providing the capability of easily switching spin orientations in a fixed-target cryostat, orienting spins in polarized gas targets internal to storage rings [16], or enabling the use of transverse fields in close proximity to the beam of a storage ring [17,18]. An advantage of the particular solution described here is the use of a relatively simple cryo-cooler to reach temperatures that are sufficient to support internal currents within the superconductor that can maintain or cancel up to 1 T fields.…”

Section: Resultsmentioning

confidence: 99%