Nuclear Engineering Commons^™

Molecular Dynamics Simulations Of Hydrogen Diffusion And Retention Behavior Near Sub-Surface Defects In Tungsten: Towards Predicting Tritium Retention In The Iter Divertor, Emily Nicole Hutchins

EURēCA: Exhibition of Undergraduate Research and Creative Achievement

Molecular Dynamics Simulations of hydrogen diffusion and retention behavior near subsurface defects in tungsten: Towards predicting tritium retention in the ITER divertor

Plasma-facing components within fusion reactors will be exposed to massive particle and thermal loads, which will pose serious material challenges. The plasma-facing component of interest in this project is the divertor, a device that allows for the online removal of the helium reaction product from the deuterium – tritium plasma. The ITER divertor will be constructed from tungsten, which is also a prime candidate for use in future demonstration fusion reactors, because of its superior mechanical properties and …

X-Means Clustering Implementing The Gap Statistic For Multiple Positron Emission Particle Tracking, Matthew Herald

EURēCA: Exhibition of Undergraduate Research and Creative Achievement

The most efficient and accurate method for clustering Coincidence Lines (CL) for Positron Emission Particle Tracking (PEPT) is undetermined. A number of methods have been created to perform this task. A novel clustering method featuring x-means is presented using an automated k-value estimator for k-means clustering. Gap statistic is used to select the best k-value. Geant4 Application for Tomographic Emission is used to simulate particles of 50 µCi and the detection and electronic chain associated with the Siemens Inveon Pre-Clinical Scanner. The simulation produces an array of coincident lines (CL) in a format consistent with scanner output. The CL are …