Miniaturization of An L-Band Relativistic Mitron-Like Crossed-Field Device Using Void Ring Metamaterial

We developed a new Mitron-like crossed-field device (MCD) using irregular-ring metarnaterials
^1,2
(MTMs) driven by a transparent cathode.
³
The operating
$\text{TE}_{21}$
mode of 1.45 GHz in L-band can operate in the MCD with anode radius
$\mathrm{R}_{\mathrm{a}}=4.11\text {cm}$
and vane radius
$\mathrm{R}_{\mathrm{V}}=2.11\text{cm}$
while it is usually cut-off in the cylindrical waveguide with radius 9.71 cm. In particle-in-cell (PIC) simulations, the maximum output power of the
$\text{TE}_{21}$
mode can be as high as 800 MW and the maximum electronic efficiency can be as high as 30% when a voltage ranging from
$\mathrm{U}=370\text{kV}\sim 430\text{kV}$
and magnetic field varying from
$\mathrm{B}=0.29\mathrm{T}\sim 0.37\mathrm{T}$
are applied. These results suggest the advantage of using MTMs for HPM device miniaturization.