A5003454597- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Shoulder Injury and Treatment
- Shoulder and Clavicle Injuries
- Laser-Plasma Interactions and Diagnostics
- Metal and Thin Film Mechanics
- Orthopedic Surgery and Rehabilitation
- Social Media in Health Education
- Evolutionary Game Theory and Cooperation
- Digital Games and Media
- Complex Systems and Time Series Analysis
- High voltage insulation and dielectric phenomena
- Particle Accelerators and Free-Electron Lasers
- Religious Education and Schools
- Sports injuries and prevention
- Advanced Data Storage Technologies
- Medical Imaging Techniques and Applications
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Dental Research and COVID-19
- Ion-surface interactions and analysis
- Electromagnetic Compatibility and Noise Suppression
Philadelphia Fire Department
2025
General Atomics (United States)
2010-2024
Georgetown University Medical Center
2023
Georgetown University
2023
Rothman Orthopaedics
2022-2023
Rothman Institute
2022-2023
Thomas Jefferson University
2022-2023
Fusion (United States)
2015
DIII-D National Fusion Facility
2015
University of Pittsburgh
2009
ABSTRACT Context: Screening programs to identify negative ulnar nerve adaptations in throwing athletes can help minimize injury risk and individualize treatment prior the onset of symptoms. However, it is currently unclear how structurally adapts chronically professional baseball pitchers. Objective: To compare ultrasound structural characteristics between (dominant) non-throwing control (non-dominant) elbows pitchers, with a secondary purpose comparing subluxating non-subluxating nerves....
An engineering upgrade to the neutral beam system at DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] enables time-dependent programming of voltage and current. Initial application this capability involves pre-programmed current injected into plasmas that are known be susceptible instabilities driven by energetic (E≥40 keV) ions. These instabilities, here all Alfvén eigenmodes (AEs), increase transport ions beyond a classical expectation based on particle drifts collisions....
Abstract A first-ever demonstration of controlling power and torque injection through time evolution neutral beam energy has been achieved in recent experiments at the DIII-D tokamak (Luxon 2002 Nucl. Fusion 42 614). Pre-programmed waveforms for produce inputs that can be separately continuously controlled. Previously, these were tailored using on/off modulation beams resulting large perturbations (e.g. swings over 1 MW). The new method includes, importantly experiments, ability to maintain...
DIII-D has four neutral beamlines (NB). Each of these two ion sources, each which injects up to 2.5 MW for 3 s. These intersect the vacuum vessel at an angle 19.5 deg off from radial, enabling current drive in same direction as plasma (co-injection). In 2004, one (210 deg) was rotated provide counter-injection (opposite current). A different beamline (150 been modified have capability off-axis beam drive. The goal injection is center sources aimed a position 40 cm below geometric plasma. To...
On the DIII-D National Fusion Facility tokamak plasma diagnostics continue to improve and experiments increase in complexity. Hence utility of dynamic control beam energy (and therefore also injected torque, ion heating fraction, etc.) has become apparent. Here we report on upgrades that have been incorporated into Plasma Control System (PCS) Neutral Beam Injection (NBI) systems order allow acceleration voltage (Vaccel) be varied continuously a ≤20 kV range during shot for first time,...
A significant engineering upgrade of the DIII-D neutral beam system has recently completed, providing ability to smoothly and independently vary voltage current. This enables greater control injected power, torque, plasma instability drive for fusion experiments. Modifications high-voltage equipment were made tested over last year allow energy by as much 20 kV a 0.5-s period anywhere within 45-85 operating range beams. The current can be track (keeping perveance constant), or varied...
Background: Pitchers frequently experience anterior shoulder pain, possibly associated with coracohumeral impingement; however, whether the distance (CHD) and/or subscapularis tendon adapt chronically (bilateral difference) due to pitching, and clinical measures are CHD organization have not been evaluated in professional pitchers. Hypothesis: The authors hypothesized that dominant arm would be smaller than nondominant arm, increased spatial frequency (ie, more disorganized), humeral...
Three designs for an 8μF 3.1kV snubber capacitor were built and tested to compare the performance of different technologies a high RMS current requirement. The (1) extended foil , (2) metalized film, (3) hybrid containing both electrode electrodes. All impregnated with vegetable oil epoxy encapsulated in same size case. prototype design was only 6μF due machine limitations on winding dimensions that have since been resolved. A short-term, stepped-voltage test performed samples each until...
Power loading on beamline components in the DIII-D neutral beam system is measured using water flow calorimetry. The results are used to benchmark transport models. Anomalously high heat loads magnet region investigated and a speculative hypothesis as their origin presented.
We report on a study of the neutralization process in DIII-D neutral beam system. Measurements efficiency are compared to theoretically predicted values and potential for deficit is explored. A molecular spectroscopic technique used measure neutralizer gas temperature results Monte-Carlo mode dynamics.