Фролов Даниил Русланович

Автореферат диссертации на соискание ученой степени кандидата физико-математических наук

A new method for extracting E/O and O/E S-parameters of a bilateral electro-optic network (BEON) is theoretically proposed. It is based on measuring reflection coefficients from three optical loads: an absorber and two mirrors. This technique includes two series of reflections measurements: first when loads are connected to optical port of BEON directly and second when loads are connected in series with optical waveguide of fixed length. Using two BEONs and this calibration technique allows to make calibrated lightwave measurements with a standard microwave network analyzer without using additional electro-optical equipment such as lightwave component analyzer or optical heterodyne techniques.

Проведен теоретический анализ метода определения комплексных коэффициентов передачи преобразователей частоты с помощью векторного анализатора нелинейных цепей с применением теории X-параметров. Рассмотрен процесс калибровки векторного анализатора нелинейных цепей с помощью генератора комбинационных частот. Получены выражения для погрешностей определения комплексных коэффициентов передачи испытуемых преобразователей частоты с помощью анализатора нелинейных цепей, при его калибровке с помощью генератора комбинационных частот. Показано, что в результате подобных измерений истинный сдвиг фаз генератора комбинационных частот остается неизвестным и поэтому определение параметров рассеяния испытуемых СВЧ-смесителей методом X-параметров носит относительный характер.

The proposed Project X machine at Fermilab must deliver a widely varying bunch pattern to provide beam to several experiments quasi-simultaneously. H- Beam is delivered to the 2.1 MeV Medium Energy Beam Transport (MEBT) section at 162.5 MHz continuous wave (CW) by a radio frequency quadrupole magnet (RFQ). Unnecessary beam bunches will be selectively chopped out in the MEBT by two identical choppers on a bunch-by-bunch basis and stopped by an absorber. The Project X Injector Experiment (PXIE) will be the test bed to demonstrate a chopper’s ability to form an arbitrary bunch pattern. Presently two kicker system versions are under development. One proposed version is a 50 Ω structure driven by a ±250 V linear amplifier. The second proposed version is a 200 Ω helical, microstrip line structure driven by a 500 V bipolar switch. This paper describes the development status of the 200 Ω version and includes the design concept, comparison of 3D modelling work with prototype measurements, 200 Ω hardware description and progress with the driver.