Engineering Papers⌕ Search

Engineering topics

Aponte, Ivan A.

Publications and source records attributed to Aponte, Ivan A..

16 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Calibration Plan

PhD project update presentation to be given to Texas Tech University advisor.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2023

Marx Source

PhD project update presentation to be given to TTU graduate advisor.

Aponte, Ivan A.↗
DOE OSTI2023

Ground Loop

Presentation providing update on diagnostic test bed.

Aponte, Ivan A.↗
DOE OSTI2023

Project Update

Monthly progress update presentation to be given to my graduate advisor at Texas Tech University.

Aponte, Ivan A.↗
DOE OSTI2023

Transfer Impedance

Explore the source record for details and available documents.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2021

Fundamental investigation of unipolar and RF corona in atmospheric air

Here, unipolar (DC) and radio frequency (RF) corona at 3.3 MHz is studied at centimeter-sized gaps in a needle-plane geometry in atmospheric air at room temperature. Positive and negative corona using pure tungsten electrodes with varying tip angles revealed a lower onset voltage for the needle with the smaller included angle. The RF corona onset voltage and corresponding time delay were measured for a series of needles composed of pure tungsten or 2% lanthanated tungsten. The corona onset, established when the first instance of UV photon emission is detected via photomultiplier tube, occurred primarily during the negative half cycle of the applied RF voltage for pure tungsten needles. In contrast, with lanthanated tungsten needles, such preference was not observed. No distinguishable difference in onset voltage between pure tungsten and lanthanated tungsten was found, indicating that adding a small amount of lanthanum to tungsten has a negligible impact on the onset voltage at 3.3 MHz frequencies for electrodes at room temperature.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗