Table 1 Comparison of quasi-optical mode converter designs for gyrotron systems, highlighting launcher length, cut length, Gaussian mode content, and conversion efficiency.
Ref | Freq. (GHz) | Mode | Length (mm) | Cut (mm) | Gaussian (%) | Eff. (%) |
|---|---|---|---|---|---|---|
104.9 | TE\(_{17,6}\) | 168 | 43.4 | 95.2% | 96.9% | |
105 | TE\(_{17,6}\) | 170 | 40 | 99.09% | NA | |
105/140 | TE\(_{18,7}\)/TE\(_{24,9}\) | 150 | 42 | 98% for 105 GHz 99.7% for 140 GHz | 97.3% for 105 GHz 99.0% for 140 GHz | |
105/140 | TE\(_{17,6}\)/TE\(_{22,8}\) | 183 | 68 | 94%–98% | 90% | |
104.9–143.3 | Multi-mode (Optimize at TE\(_{17,6}\) and 104.9 GHz) | 160 | 40 | \(\sim\)98.0% at TE\(_{17,6}\) for 104.9 GHz | NA | |
104.9–143 | Multi-mode (Optimize at TE\(_{17,6}\) and 104.9 GHz) | 168 | 50 | 95.2% at TE\(_{17,6}\) for 104.9 GHz | 96.9% at TE\(_{17,6}\) for 104.9 GHz | |
This work | 105 | TE\(_{17,6}\) | 85 | 20 (23.53% of total length) | 98.6% (vector) 99.4% (scalar) | 98.6% |
