Abstract: The design, fabrication and detailed understanding of static magnetic fields are essential components in the development and operation of particle accelerators.

Material properties and space constraints are among the considerations contributing to the magnet engineering design process. This project will take the participant through the magnet design process, finite-element modeling calculations, and the implementation of these in the lattice model either as field maps or in parameterized form. The full-ring model is used both for beam optics development and for optics correction procedures during operation of the storage ring.

Of particular interest are optics corrections and tracking analysis for the recently-installed magnets in the south arc of the Cornell Electron Storage Ring.

Abstract: Recently, our search for the radiation expected to accompany the ejection of an electron from the inner shell of an atom upon the absorption of a high energy photon gave a surprise: it was not present at the expected level (see first recent work item at http://franckgroup.lassp.cornell.edu/ In order to raise the sensitivity of future searches for such a fundamental radiative process, we need to improve our understanding of the competing multiple scattering effects that involve more than one atom in our solid targets. Our proposed summer REUproject is to perform simulations of photon electron interactions in condensed matter to address this concern.

Abstract: Optical Stochastic Cooling (OSC) is a beam cooling technique that involves propagating light and particles over long distances. Because of the nature of OSC, the light and particles must both have paths that are stabilized and synchronized to one another. The planned system to accomplish this is an Electro-optic modulator (EOM) based feedback system. In order to properly model this system accounting for the pulse structure of detected synchrotron radiation, analytical and numerical models of the planned OSC feedback system will need to be developed and analyzed by the REU student. The project will involve learning basic control theory and how to integrate it with computational tools like Simulink.

Abstract: A beam position monitor (BPM) is a key instrumentation that measures the position of a particle beam within particle accelerators and storage rings. The beam position is the "life pulse" of these very complex machines and is at the core of their daily operation. There are about 120 BPMs deployed around the Cornell Electron Storage Ring (CESR). The measurement precision of the BPMs drives the performance and beam quality achievable by CESR and in turn by the Cornell High Energy Synchrotron Light Source (CHESS).
As both CESR and CHESS are pushing toward higher performance, so do the CESR BPMs (CBPM). The REU student will join the on-going effort to develop the next generation CBPM system and will focus on the software part of the project. The student will help with developing a web-browser based display (dashboard) written in Python3. This includes software development for the front-end (using Plotly Dash module), back-end (using Numpy, Pandas modules) and database interface (using Psycopg2 module to communicate with a PSQL database). A specific project of interest is to develop an asynchronous version of the existing code using the Celery module. This would offer better performance and flexibility over the current blocking version of the code.
Requirements: being familiar with Python3 and having notions of the various modules detailed above

Abstract: In some cases superconductors irradiated with microwaves will display stronger superconducting properties. For low amplitude and high frequency fields this effect has been explained by redistribution of the excitations in the superconductor to higher energies. In the application of particle beam acceleration three-dimensional superconducting RF (SRF) resonators are designed to create enormous microwave field amplitudes with relatively low frequencies. In this regime the previous picture does not seem applicable yet similar enhancements of the superconducting properties have been observed in niobium resonators with certain surface treatments. Several models have been proposed to explain this phenomenon in this low frequency high field regime but none sufficiently explain experimental results. Beyond scientific curiosity this has practical importance allowing for significantly more efficient accelerators.