![]() Critical coupling and bead-pull measurements are performed at the TM010-like mode frequency, 2.45 GHz for the quality factor and shunt impedance of the high-β cavity. Equivalent circuit components of an equatorially misaligned single-cell aluminum elliptical cavity are obtained from the measured data and are employed to calculate longitudinal impedance and modal wake function. In this study experimental and computational investigations to quantify the effects of transversal half-cell misalignments on the fundamental accelerator cavity parameters and beam dynamics are presented. One of the most challenging problems in modern particle accelerator systems is the manufacture of RF cavities within the desired tolerance limits. The results are then compared with the simulations and found to be in good agreement. Afterwards, two scaled prototypes are tested on an automatic test bench with great efficiency and accuracy. Based on this concept, a rectangular and an elliptic cavity are investigated by analytic and numerical means in compliance with the machine parameters of the Collector Ring. An innovative design of the position cavity is then introduced, which offsets the cavity from the central orbit and exploits the resonant monopole mode. In this dissertation, the correction method for the anisochronism effect with a cavity doublet is outlined. Moreover, this approach also enables simultaneous lifetime measurements of the stored ions. As a complementary approach, it is proposed to measure the magnetic rigidities of the circulating ions non-interceptively with an intensity-sensitive and a position-resolving cavity jointly to overcome this limitation. Although this anisochronism effect can be corrected for by measuring the velocity of each ion with two time-of-flight detectors, the number of admissible ions is severely limited by this detection technique. However, the isochronism condition cannot be fulfilled for all the stored ions due to the large momentum acceptance of the ring, which restricts the measurement precision. A side study investigating material engineering by means of rapid thermal annealing to tune the device absorption spectrum, that together with the possibility of customising the device design, permits to expand the operation bandwidth while supporting either the transverse electric or transverse magnetic polarisation, is also presented.Ī heavy-ion storage ring can be operated as an isochronous mass spectrometer with a particular ion-optical setting. Scattering parameters measurements also permitted to evaluate a power consumption of 44 fJ/bit, confirming the exceptional electro-optical efficiency of the design. As a result, a device with cutting edge performances was realised, measuring dynamic extinction ratio of 5.2 dB at 56 Gbps with 3dB bandwidth of 56 GHz. A simulation platform was, in fact, built to estimate electro-optic performances of design variations and define process recipes the design reference was, then, translated in a set of masks used in the fabrication run. Starting from a blank canvas, this project benefited from simulation study, process development and fabrication run. The novelties of this design are found in the thick platform, which permits better optical confinement, and the wrap-around junction design that enables definition of wide rib while keeping strong electric field distribution in the active portion of the rib. Offering a fast, power efficient and easy to produce, integrated optic modulator working in the C and L band of the communication spectrum for datacentre applications, this thesis presents an innovative Franz-Keldysh based modulator, integrated in a rib waveguide on the 800 nm platform and fully CMOS compatible. An ambitious yet necessary objective is envisioned by 2030, link speed above 1 Tb/s allowing sophisticated web-services to grow and reach users worldwide. The growing of Internet has driven recent development of Silicon Photonics in the attempt of coping with the unceasing demand of bandwidth at cheap cost datacentres with large footprint and enormous computational performances are deployed every year with a rate that, by 2021, will represent the 53% of the total count of installed servers. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |