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Related Experiment Video

Updated: Feb 25, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Observation of Quasichanneling Oscillations.

T N Wistisen¹, R E Mikkelsen¹, U I Uggerhøj¹

¹Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark.

Physical Review Letters

|July 29, 2017

Summary

Researchers experimentally observed quasichanneling oscillations in high-energy particle beams interacting with a bent silicon crystal. This confirms theoretical predictions and reveals distinct oscillation patterns for electrons and positrons.

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Area of Science:

High-energy physics
Condensed matter physics
Crystallography

Background:

Above-barrier particles interacting with crystals are typically assumed to behave amorphously.
Recent theoretical work and simulations predicted the existence of quasichanneling oscillations.

Purpose of the Study:

To experimentally observe and characterize quasichanneling oscillations.
To investigate particle behavior beyond amorphous approximations in crystal interactions.

Main Methods:

Utilizing the quasimosaic effect with a bent silicon crystal.
Directing 20.35 GeV positrons and electrons at the crystal.
Observing particle trajectories and oscillation patterns.

Main Results:

First experimental observation of quasichanneling oscillations.
Two distinct quasichanneling peaks identified for electrons.
Seven clear quasichanneling peaks identified for positrons.

Conclusions:

Experimental evidence confirms the theoretical predictions of quasichanneling oscillations.
Positron interactions with bent crystals exhibit more pronounced quasichanneling effects than electrons.
This phenomenon challenges the amorphous approximation for above-barrier particles in crystals.