Publications by authors named "A C Sontag"
Pegasus-III is an ultralow aspect ratio spherical tokamak providing a dedicated US experiment for comparative solenoid-free startup studies. A new magnetic diagnostic suite for equilibrium and low frequency (<200 kHz) magnetohydrodynamic mode analysis has been installed. These new diagnostics address the significant challenges of measuring magnetic field in a high noise environment with the majority constrained to fit in an 8 mm diagnostic gap on the high field side.
View Article and Find Full Text PDFA suite of diagnostics used to assess impurity content and dynamics has been updated, upgraded, and installed on the Pegasus-III Experiment. Typical plasma parameters during local helicity injection start-up are τshot ∼ 10 ms, ne ∼ 1 × 1019 m-3, and Te ∼ 50 eV. The deployed diagnostics are compatible with this modest temperature and density regime and provide species identification, source localization, and estimation of radiation losses.
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- Some medical teams want to start using "prehabilitation" to help frail patients get ready for surgery, but they haven't done it widely yet.
- They studied many articles to find out what helps or stops prehabilitation from working well for these patients.
- Good factors include customizing care for each patient and having a supportive team, while challenges include transportation issues and not enough support from family or friends.
The filterscope diagnostic on DIII-D utilizes photomultiplier tubes to measure visible light emission from the plasma. The system has undergone a substantial upgrade since previous attempts to cross-calibrate the filterscope with other spectroscopic diagnostics were unsuccessful. The optics now utilize a dichroic mirror to initially split the light at nearly 99% transmission or reflectance for light below or above 550 nm.
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- Fecal urgency, a symptom of Ulcerative Colitis (UC), was studied to understand its association with patient characteristics and treatment changes among 400 patients in the CorEvitas Inflammatory Bowel Disease Registry.
- The study classified patients into four groups based on their urgency status at enrollment and after 6 months, finding that those with persistent or changing urgency reported more comorbidities and had worse overall health outcomes.
- Results indicated that patients experiencing urgency were more likely to change treatments within the 6-month follow-up, suggesting urgency may indicate inadequate therapy and negatively impacts quality of life.