Search NASA⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 1809065

Nonuniform Flow Dynamics Probed by Nanosecond X-Ray Speckle Visibility Spectroscopy

Sun, Yanwen·Carini, Gabriella·Chollet, Matthieu·Decker, Franz-Josef·Dunne, Mike·Fuoss, Paul·Hruszkewycz, Stephan O.·Lane, Thomas J.·Nakahara, Kazutaka·Nelson, Silke·Robert, Aymeric·Sato, Takahiro·Song, Sanghoon·Stephenson, G. Brian·Sutton, Mark·Van Driel, Tim B.·Weninger, Clemens·Zhu, Diling
View original source ↗Read source document ↗Export metadata ↓

Abstract

We report observations of nanosecond nonuniform colloidal dynamics in a free flowing liquid jet using ultrafast x-ray speckle visibility spectroscopy. Utilizing a nanosecond double-bunch mode, the Linac Coherent Light Source free electron laser produced pairs of femtosecond coherent hard x-ray pulses. By exploring anisotropy in the visibility of summed speckle patterns which relates to the correlation functions, we evaluate not only the average particle flow rate in a colloidal nanoparticle jet, but also the nonuniform flow field within. The methodology presented here establishes the foundation for the study of nano- and atomic-scale inhomogeneous fluctuations in complex matter using x-ray free electron laser sources.

Explore related subjects

47 OTHER INSTRUMENTATIONColloidsCondensed Matter & Materials PhysicsPolymers & Soft MatterX-ray photon correlation spectroscopy

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Sun, Yanwen, Carini, Gabriella, Chollet, Matthieu, Decker, Franz-Josef, Dunne, Mike, Fuoss, Paul, Hruszkewycz, Stephan O., Lane, Thomas J., Nakahara, Kazutaka, Nelson, Silke, Robert, Aymeric, Sato, Takahiro, Song, Sanghoon, Stephenson, G. Brian, Sutton, Mark, Van Driel, Tim B., Weninger, Clemens, Zhu, Diling. 2021-07-28. Nonuniform Flow Dynamics Probed by Nanosecond X-Ray Speckle Visibility Spectroscopy. https://doi.org/10.1103/physrevlett.127.058001

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

High Multiplicity Trigger for long-lived particles in CMS detector

Searches for long-lived particles (LLPs) at the CMS experiment often involve unconventional event topologies that are difficult to efficiently select using standard trigger strategies. To improve sensitivity to such signatures during LHC Run 3 operation, a dedicated High Multiplicity Trigger (HMT) has been developed and deployed in the CMS trigger system. The trigger targets events containing unusually large numbers of hits in the CMS cathode strip chamber (CSC) muon detectors, a characteristic signature of several LLP scenarios involving displaced decays in the muon system. The HMT implementation, trigger logic, rate dependence with pileup, and operational stability are described. Optimized hit multiplicity thresholds are used to maintain acceptable trigger rates under high-luminosity and high-pileup conditions while preserving high efficiency across a broad range of LLP lifetimes and kinematic regimes. The trigger performance is evaluated using both simulated event samples and proton-proton collision data collected during Run 3 of the LHC. The HMT substantially extends the CMS sensitivity to non-standard signatures associated with LLP decays and provides a flexible platform for future searches for physics beyond the Standard Model.

47 OTHER INSTRUMENTATION↗