Electromagnetic Energy in Axion Haloscopes and Cavities

by Tommy on 23/01/2017

This showed up in the popular press this morning, finally.

https://arxiv.org/abs/1608.00843

http://journals.aps.org/prd/abstract/10.1103/PhysRevD.94.111702

Electric and magnetic energy at axion haloscopes, B. R. Ko, H. Themann, W. Jang, J. Choi, D. Kim, M. J. Lee, J. Lee, E. Won, and Y. K. Semertzidis, Phys. Rev. D 94, 111702(R) (9 December 2016), doi:10.1103/PhysRevD.94.111702

We review the electro-magnetic energy at axion haloscopes and find that the electric and the corresponding magnetic energy stored in the cavity modes or, equivalently, the mode dependent electric and magnetic form factors are the same regardless of the position of the cavity inside the solenoid. Furthermore, we extend our argument to the cases satisfying ⃗∇ ×⃗ ⃗Bexternal = 0, where ⃗Bexternal is a static magnetic field provided by a magnet at an axion haloscope. Two typical magnets, solenoidal and toroidal, satisfy ⃗∇ ×⃗ ⃗Bexternal = 0; thus, the electric and the corresponding magnetic energy stored in the cavity modes are always the same in both cases. The energy, however, is independent of the position of the cavity in axion haloscopes with a solenoid, and depends on those with a toroidal magnet.

I’ve given up on commenting on these popular science press articles.

In fact, I’ve given up on commenting on axions completely.

I’ve already said what I intend to say about them.

It’s all about detection and theory now.

lifeform@charter.net

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