| Paper | Title | Page |
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MOPB009 |
Harmonic cavity dynamics studies: efficient methods and new type of Robinson instabilities | |
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| In order to cope with the intrabeam scattering effect induced emittance growth, the Touschek scattering effect induced beam lifetime limitation and the beam-impedance coupling effect induced instability growth, harmonic cavities are used to stretch the bunch and provide Landau damping, which has become a necessary choice for modern advanced synchrotron light sources. However, harmonic cavities operated in bunch lengthening mode can cause some adverse effects such as beam loading, Robinson instability, etc., which possibly pose a limitation on the maximum bunch lengthening. This paper will report on our research progress on harmonic cavity dynamics associated with efficient methods for bunch lengthening calculation and new type of Robinson instabilities. | ||
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MOPB024 |
Accelerator-Based High-Throughput Material Physical Property Measurement System in Terahertz Near-Field | |
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| Superconductor, multiferroic material, giant magnetoresistance etc.,are keystones to information, energy, optoelectronics industries. Inside the THz band, their common characteristic properties are all related to the THz complex optical constant, and they also strongly interact with the ultrafast THz waves, resulting in many fascinating phenomena in physics. Applying the combinatorial material synthesis technique, a key step in the Materials Genome Initiative (MGI) project, requires a novel ‘step-less¿high-throughput characterization method that is still unavailable today, mainly because of the diffraction limit of the THz waves. In this program we will develop a new high throughput material characterization system under the THz near-field, integrating with varying magnetic, temperature and electrical fields. The system will directly measure the complex dielectric constant tensor, which correlates directly to the superconductor bandgap, magnetoelectric coupling, resistance and dielectric constant in the THz band, and plasmonic resonance. This system will be useful in the MGI project to realize highly efficient material screening, and will thus very helpful for finding new materials. | ||
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