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REU 2020 Projects

Michael Kaemingk TBD
"Developing sources with spatially dependent work functions for nanometer-sized electron beams"

Abstract: Not yet available.

Chris Pollock & Louise Debefve TBD
"Developing New Tools For Science: Design of an electrochemical sample cell for operando x-ray spectroscopy"

Abstract: The harnessing of electrochemical energy—such as in batteries, fuel cells, and during chemical catalysis—is a critically important component of a green energy economy. Advancement of these technologies requires an atomic-level understanding of how the chemical reactions in these systems unfold so that we can optimize existing processes and design entirely new ways to generate, store, and utilize electrochemical energy. X-ray spectroscopy provides one means of studying these reactions, allowing detailed geometric and electronic structure information to be extracted from electrochemical processes occurring under operating conditions. Unfortunately, the study of such systems can be experimentally challenging and often requires a specific sample environment to allow electrochemical reactions to be probed using x-ray methods. The focus of this summer project is thus to design a sample cell that will allow electrochemical reactions to be studied under operating conditions using x-ray spectroscopic methods. This project will be particularly interesting for students with experience in design or CAD.

Stanislav Stoupin TBD
"Understanding how X-rays can deform crystals: Thermoelastic response of optical materials under penetrating heat load of X-rays"

Abstract: Modern large-scale X-ray sources such as synchrotrons and high-repetition-rate X-ray Free-Electron Lasers generate high-power radiation heat load on primary X-ray optical components. While dissipating the overall heat load (total absorbed power from few Watts to ~1 kW) is straightforward using cryogenic or water cooling, heating optical materials with energetic, penetrating (mm-sized) X-ray beams generates non-uniform volumetric heat sources, which results in thermoelastic distortion of the optics across the beam footprint. This distortion (even at a level of just a few microradians) can affect the optics performance (e.g., reduced efficiency of the optics and/or wavefront distortions of the reflected radiation [1,2]). The thermoelastic distortion can be reduced by proper choice of the optics shape and its boundary conditions (heat transfer coefficient, thermal contact surface area and coolant temperature).
The thermoelastic response can be evaluated experimentally and studied numerically using finite-element analysis (FEA), however, the existing analytical models (e.g., [3,4]) are insufficient to properly guide (or to verify) the experimental and simulation effort. The first goal of the project is to solve (using reasonable approximations) the thermoelastic equations for a simple, yet realistic case: an optical element as an isotropic solid with cuboid shape illuminated with an X-ray beam incident at some angle to one of the faces. The second goal is, using the obtained approximate solution for the thermoelastic response, to study the influence of the geometry, the boundary conditions, the heat source and relevant (in general, temperature dependent) material parameters.
[1] A. Chumakov et al., J. Synchrotron Rad. 11, 132, (2004).
[2] S. Stoupin et al., J. Appl. Cryst. 48, 1734, (2015).
[3] Subbotin, V. I., et al., Sov.Phys. Dokl. 33, 633-635, (1988).
[4] W. Schildkamp, Rev. Sci. Instrum., 73, 1571, (2002).

Luca Cultrera & Jai Kwan Bae TBD
"Intense electron beam production for hadron cooling and highly spin polarized sources"

Abstract: Not yet available

Chris Pierce & Alice Galdi TBD
"Characterizing the Mean Transverse Energy of a Cryocooled Photocathode"

Abstract: Not yet available

Jim Crittenden Co-mentors: Adam Bartnik, Colwyn Gulliford, Kirsten Dietrick TBD
"Commissioning Experience and Data Analysis for the Splitter/Combiner Lines in the Cornell-Brookhaven Energy-Recovery-Linac Test Accelerator"

Abstract: The Cornell-Brookhaven Energy-Recovery-Linac Test Accelerator (CBETA) will provide a 150 MeV electron beam using four acceleration and four deceleration passes through the Cornell Main Linac Cryomodule housing six 1.3-GHz superconducting RF cavities. The return path of this 76-m-circumference accelerator is provided by 106 fixed-field alternating-gradient (FFA) cells which guide the four beams of 42, 78, 114 and 150 MeV in a vacuum chamber of 84x24 mm interior dimensions. This REU project concerns the splitter/combiner lines which serve to match the on-axis linac beam to the off-axis beams in the FFA cells, providing the path-length adjustment necessary to control the acceleration and deceleration phases for each of the beams. In these regions of the accelerator immediately upstream and downstream of the main linac, each beam energy has its own 36x24 mm vacuum chamber roughly 10 m long. The splitter/combiner lines are comprised of a total of 48 dipole electromagnets, 64 quadrupoles and 32 vertical correctors. At the time of this writing, December 2, 2019, the commissioning work has just reached the design maximum energy of 150 MeV and recirculated the beam through the return loop and the fourth splitter line to the entrance of the linac. Beam tuning for the decelerating passes is about to begin. This project provides the rare opportunity to learn from the early commissioning phase of a new accelerator.

Suntao Wang TBD
"Particle tracking with high-order Taylor maps in CESR"

Abstract: Not yet available

Kirsten Deitrick TBD
"Accelerator Design of eRHIC by Optimization"

Abstract: Not yet available

William Li TBD
"Maximizing brightness in an ultrafast electron diffraction beamline"

Abstract: Not yet available

Chad Pennington TBD
"Development of a magnetic spectrometer for measuring ultrafast phenomena with relativistic electron beams"

Abstract: Not yet available

Thomas Oseroff TBD
"Simulations of proximity coupling effects relevant for SRF applications within time-dependent Ginzburg-Landau theory"

Abstract: Not yet available

Neil Stilin & Pete Koufalis TBD
"Magnetic shielding of SRF cavities"

Abstract: Not yet available

Matthew Andorf TBD
"Installation and testing of the light-optics path for Optical Stochastic Cooling"

Abstract: Optical Stochastic Cooling (OSC) is an advanced beam cooling technique being tested in the Cornell Electron Storage Ring (CESR). In OSC light radiation generated in an upstream 'pickup' undulator (PU) is made to interact with a second downstream 'kicker' undulator (KU). For the OSC experiment in CESR the light path is approximately 70 meters long. Critical for the success of the experiment, the light path must transport the PU radiation over this 70 meters with a stability of approximately 40 nm and align with the electron bunch inside the KU. We will be installing the light path this summer and the student will learn a combination of geometric optics, ultra-fast laser and electron storage ring physics.

Colwyn Guliford TBD
"Integration of advanced beam dynamics tools in the CBETA controls system"

Abstract: Not yet available.

Jacob Ruff & Purnima Ghale TBD
"Hunting for hidden orders via numerical analysis of x-ray diffraction"

Abstract: The QM2 beamline at CHESS specializes in collecting comprehensive diffraction data from complex quantum materials. This instrument collects about 30 million distinct measurements each second. The information content of these datasets is too large to be effectively analyzed using traditional means. Collaborating with staff scientists and postdocs at CHESS, an REU researcher will apply strategies from data science and high performance computing to uncover "hidden" ordered states within the deluge of data from QM2. Developing workflows to transform, visualize, and analyze QM2 data, the REU researcher will hunt for physically interesting needles in multidimensional haystacks. Interests in python, scientific computing, and machine learning, and quantum physics are assets for this position.

Kate Shanks TBD
"Design of a Standardized Detector Testbench"

Design of a new detector readout integrated circuit (ROIC) requires multiple phases of iterative design and testing. Often, this process involves early-stage prototype ROICs that contain fully-functional pixel arrays but that are not compatible with the standard data acquisition systems (DAQs) used for full-scale detectors. The DAQ is required to provide voltage and current biases, generate and transmit control waveforms, and capture data and in practice is frequently re-designed for any given prototype ROIC. When a new ROIC is tested on a new DAQ, debugging the system as a whole is complicated and inefficient because it is often unclear whether problems originate in the DAQ or the ROIC. This project will focus on the design of a standardized DAQ for testing of small-scale (e.g. of order 4 readout channels) prototype detector ROICs and ROIC/sensor hybrid modules. This may include: PCB design and layout, FPGA design, and/or software design; the scope of the project can be tailored to the student’s skillset and interests.

Projects are being added; check back periodically for updated project listing. You don't have to wait for all the projects to be posted here to apply - if you get selected for our program, we will contact you further with selection options.