# Hybrid HE11 mode of corrugated waveguides as source of axion

1. Jun 19, 2015

### Ricvil

Why HE11 mode of corrugated waveguides would not be a natural source of axion field?

2. Jun 19, 2015

### fzero

The source term for the axion is proportional to $\mathbf{E}\cdot \mathbf{B}$. This quantity is suppressed by a factor of $\lambda/a$, where $\lambda$ is the wavelength and $a$ is the radius of the waveguide. Looking around I found a paper suggesting that some of the waveguides involved in ITER have $\lambda/a \sim 1/20$, so perhaps this isn't a huge suppression.

The original Sikivie paper is available at http://ccdb5fs.kek.jp/cgi-bin/img/allpdf?198309239 [Broken]. Perhaps you can modify his eqs (6,7) in order to estimate the axion production in this situation.

Last edited by a moderator: May 7, 2017