The last results of working out of OW clinotrons are brought. The output power was received by units of watts in short-wave part of millimeter wave band (weight of packed device is 1.2 kg) and hundreds of milliwatts in long-wave part of submillimeter wave band (weight is 12 kg). The compact self-contained cooling system on the basis of heat pipe was created for millimeter clinotrons.
E. E. Lysenko,
"CW clinortrons", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22502V (1 January 1994); doi: 10.1117/12.2303120; https://doi.org/10.1117/12.2303120