Efficiency Enhancement of a Dual-Band Magnetically Insulated Line Oscillator Using a Modulation Cavity

Performance improvement studies of axially partitioned dual band magnetically insulated line oscillator

“…In dual frequency MILOs, several distinctive procedures for the accomplishment of HPM generation at dual frequencies in a band or in different bands are reported in the literature. [4][5][6][7][8][9][10][11][12][13][14] The procedure of partitioning of slow wave structure (SWS) section azimuthally (with sector angle of 180 each) with different radii in respect of the resonance frequencies is one method. This technique gave a low frequency gap between the frequencies and that constitutes the bi-frequency MILO (BFMILO), [4][5][6] thereby limiting its realization in upper frequency bands.…”

“…12 Later Singh et al reported several axially partitioned DBMILO that incorporates a simple and symmetric cathode with single RF outlet while generating the HPM at dual bands by using several SWS types, namely, smooth, ridge type, and incorporation of modulation cavity in the SWS sections, respectively. [12][13][14] These designs had achieved the peak conversion efficiencies of 12.8%, $16.4%, and 17.1%, respectively, with beam voltages of 500 kV and $56 kA of the device current. [12][13][14] In all of these designs, [12][13][14] the generated output power, which is the collective power of the TM 01 and TM 02 modes, as well as quite a large device current of $56 kA are observed.…”

“…[12][13][14] These designs had achieved the peak conversion efficiencies of 12.8%, $16.4%, and 17.1%, respectively, with beam voltages of 500 kV and $56 kA of the device current. [12][13][14] In all of these designs, [12][13][14] the generated output power, which is the collective power of the TM 01 and TM 02 modes, as well as quite a large device current of $56 kA are observed.…”

“…Also, the reported axially partitioned DBMILO designs had the presence of RF choke at the input SWS section only. [12][13][14] Thus, by providing an additional RF choke at the other SWS region can improve the overall RF growth by restricting the backward wave propagation of the generated RF in the other SWS.…”

“…III, the design of the SWS regions and the optimization of the remaining sections of the device through beam present simulations using Computer Simulation Technology (CST) Studio Suite are presented. In addition, the device performance is compared to the several DBMILOs reported in the literature [12][13][14] along with performance variations to the operating voltages. At last, the conclusion and the future scope of the present work are presented.…”