A Continuous-wave Second Harmonic Gyrotron Oscillator at 460 GHz

Download or read book A Continuous-wave Second Harmonic Gyrotron Oscillator at 460 GHz written by Melissa Kristen Hornstein and published by . This book was released on 2005 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The liquid crystalline technique was adapted from a technique employed in temperature measurements in electronic devices. Originally employed for use in diagnosing laser beams, we demonstrate the first use of a pyroelectric camera at millimeter frequencies. A study of the overmoded microwave transmission and mode conversion system of a 140 GHz gyrotron oscillator, the first in a series of DNP gyrotrons, is also presented. The losses were characterized under a succession of iterative configurations for optimization of power transmission, including the design and implementation of a new TE0 1 to TE1 1 waveguide mode converter. The result of this study was a reduction of the total loss of the transmission system from nearly 9 dB to 4.5 dB. In addition to becoming a milestone in high frequency second harmonic design, the successful completion of the 460 GHz gyrotron experiment will allow the highest field DNP experiments to date. The success of experiments on three gyrotron oscillators, at 460, 250, and 140 GHz makes an important contribution to the body of knowledge on the development of high frequency, CW, second harmonic, and low power gyrotrons.