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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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Related Experiment Video

Updated: Jun 10, 2026

Cryogenic Liquid Jets for High Repetition Rate Discovery Science
08:34

Cryogenic Liquid Jets for High Repetition Rate Discovery Science

Published on: May 9, 2020

Resonant cryogenic chopper.

L A Page, E S Cheng, S S Meyer

    Applied Optics
    |August 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new resonant cryogenic chopper operating at 4.2 K offers robust mechanical and thermal performance. This device can occult a 2.54-cm aperture at 4.5 Hz with minimal power dissipation, enabling optimized performance and interference analysis.

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    Area of Science:

    • Experimental physics
    • Cryogenic engineering
    • Instrumentation development

    Background:

    • Cryogenic choppers are essential components in various scientific instruments requiring low-temperature operation.
    • Existing choppers may face limitations in mechanical robustness, thermal management, or field controllability.
    • Optimizing chopper performance is crucial for enhancing data quality and enabling new experimental capabilities.

    Purpose of the Study:

    • To present the design, construction, and performance evaluation of a novel resonant cryogenic chopper.
    • To demonstrate the chopper's mechanical and thermal robustness at 4.2 K.
    • To highlight the controllability of magnetic fields for performance optimization and interference studies.

    Main Methods:

    • Detailed description of the chopper's resonant design and construction.
    • Experimental setup for performance testing at cryogenic temperatures (4.2 K).
    • Measurement of key parameters including aperture occultation frequency, power dissipation, and magnetic field control.

    Main Results:

    • The cryogenic chopper operates reliably at 4.2 K, occulting a 2.54-cm aperture at 4.5 Hz.
    • The device exhibits excellent mechanical and thermal robustness, dissipating approximately 1 mW.
    • Controllable stator and rotor magnetic fields were implemented for performance tuning and interference assessment.

    Conclusions:

    • The developed resonant cryogenic chopper is a mechanically and thermally robust instrument suitable for low-temperature applications.
    • Controllable magnetic fields enhance the chopper's utility for performance optimization and interference analysis.
    • The presented data on long-term amplitude stability indicate reliable and consistent operation.