Mode selection by ohmic losses in longitudinally corrugated cavities of sub-THz second-harmonic gyrotrons

• Дата: 2019
• Автори: Tkachova, T.I., Shcherbinin, V.I., Tkachenko, V.I.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2019
• Назва видання: Вопросы атомной науки и техники
• Теми: Non-relativistic and relativistic electronics
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/195162
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Mode selection by ohmic losses in longitudinally corrugated cavities of sub-THz second-harmonic gyrotrons / T.I. Tkachova, V.I. Shcherbinin, V.I. Tkachenko // Problems of atomic science and technology. — 2019. — № 4. — С. 31-34. — Бібліогр.: 9 назв. — англ.

Ohmic wall losses are proposed as a means for improving the mode selection in a cylindrical gyrotron cavity with longitudinal wedge-shaped corrugations. Such losses depend on mode frequency and geometrical parameters of the corrugations. For cavity of the 0.4-THz second-harmonic gyrotron we find the corrugation depth, which corresponds to maximum ohmic losses of the competing modes excited at the first (fundamental) cyclotron resonance, as well as to reasonably low losses of the operating mode. For this depth, we determine the number of corrugations and their width, which ensure the maximum enhancement of the ohmic wall losses of the fundamental modes with respect to those of the operating second-harmonic mode, together with minimum conversion of the operating second-harmonic mode to higher Bloch harmonics. Parameters of the corrugations in hand are practicable.