English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present 3D calculations for dielectric haloscopes such as the currentlyenvisioned MADMAX experiment. For ideal systems with perfectly flat, paralleland isotropic dielectric disks of finite diameter, we find that a geometricalform factor reduces the emitted power by up to $30\,\%$ compared to earlier 1Dcalculations. We derive the emitted beam shape, which is important for antennadesign. We show that realistic dark matter axion velocities of $10^{-3} c$ andinhomogeneities of the external magnetic field at the scale of $10\,\%$ havenegligible impact on the sensitivity of MADMAX. We investigate designrequirements for which the emitted power changes by less than $20\,\%$ for abenchmark boost factor with a bandwidth of $50\,{\rm MHz}$ at $22\,{\rm GHz}$,corresponding to an axion mass of $90\,\mu{\rm eV}$. We find that the maximumallowed disk tilt is $100\,\mu{\rm m}$ divided by the disk diameter, therequired disk planarity is $20\,\mu{\rm m}$ (min-to-max) or better, and themaximum allowed surface roughness is $100\,\mu{\rm m}$ (min-to-max). We showhow using tiled dielectric disks glued together from multiple smaller patchescan affect the beam shape and antenna coupling.

Simulating MADMAX in 3D: Requirements for Dielectric Axion Haloscopes