Professor Ray Sharples' Outputs (3)

Correcting Turbulence-induced Errors in Fiber Positioning for the Dark Energy Spectroscopic Instrument (2024)
Journal Article
Schlafly, E. F., Guy, J., Honscheid, K., Kent, S., Koposov, S. E., Aguilar, J., Ahlen, S., Bailey, S., Brooks, D., Claybaugh, T., Dawson, K., Doel, P., Fanning, K., Finkbeiner, D. P., Font-Ribera, A., Forero-Romero, J. E., Gontcho A Gontcho, S., Gutierrez, G., Kirkby, D., Kisner, T., …DESI. (2024). Correcting Turbulence-induced Errors in Fiber Positioning for the Dark Energy Spectroscopic Instrument. Astronomical Journal, 168(6), Article 263. https://doi.org/10.3847/1538-3881/ad7e12

Highly multiplexed, robotic, fiber-fed spectroscopic surveys are observing tens of millions of stars and galaxies.
For many systems, accurate positioning relies on imaging the fibers in the focal plane and feeding that information
back to the robot... Read More about Correcting Turbulence-induced Errors in Fiber Positioning for the Dark Energy Spectroscopic Instrument.

Overview of the Fiber System for the Dark Energy Spectroscopic Instrument (2024)
Journal Article
Poppett, C., Tyas, L., Aguilar, J., Bebek, C., Bramall, D., Claybaugh, T., Edelstein, J., Fagrelius, P., Heetderks, H., Jelinsky, P., Jelinsky, S., Lafever, R., Lambert, A., Lampton, M., Levi, M. E., Martini, P., Rockosi, C., Schmoll, J., Sharples, R. M., Sirk, M., …Zhou, R. (2024). Overview of the Fiber System for the Dark Energy Spectroscopic Instrument. Astronomical Journal, 168(6), Article 245. https://doi.org/10.3847/1538-3881/ad76a4

The Dark Energy Spectroscopic Instrument (DESI) is a revolutionary instrument designed for precise measurements of cosmic distances and the investigation of dark energy. DESI utilizes 5000 optical fibers to simultaneously measure the spectra of dista... Read More about Overview of the Fiber System for the Dark Energy Spectroscopic Instrument.

A field programmable gate array based Langmuir probe system for measurement of plasma parameters at 500 kHz in a high-power impulse magnetron sputtering plasma. (2024)
Journal Article
Hickling, C. J., Hall, S., Harrison, J. R., Sharples, R., & Bradley, J. W. (2024). A field programmable gate array based Langmuir probe system for measurement of plasma parameters at 500 kHz in a high-power impulse magnetron sputtering plasma. Review of Scientific Instruments, 95(3), Article 033503. https://doi.org/10.1063/5.0174458

By utilizing Field Programmable Gate Arrays in a configuration similar to that of the Mirror Langmuir Probe, it is possible to bias a single probe at three precise voltages in sequence. These voltages can be dynamically adjusted in real-time based on... Read More about A field programmable gate array based Langmuir probe system for measurement of plasma parameters at 500 kHz in a high-power impulse magnetron sputtering plasma..