  The 8.4 Tesla, 10 m long transverse magnetic field of a twin aperture LHC
bending magnet can be utilized as a macroscopic coherent solar axion-to-photon
converter. Numerical calculations show that the integrated time of alignment
with the Sun would be 33 days per year with the magnet on a tracking table
capable of $\pm 5^o$ in the vertical direction and $\pm 40^o$ in the horizontal
direction. The existing lower bound on the axion-to-photon coupling constant
can be improved by a factor between 50 and 100 in 3 years, i.e.,
$g_{a\gamma\gamma} \lesssim 9\cdot 10^{-11} GeV^{-1}$ for axion masses
$\lesssim$ 1 eV. This value falls within the existing open axion mass window.
The same set-up can simultaneously search for low- and high-energy celestial
axions, or axion-like particles, scanning the sky as the Earth rotates and
orbits the Sun.
