Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade.

D Liu1, W W Heidbrink1, K Tritz2

  • 1Departments of Physics and Astronomy, University of California, Irvine, California 92697, USA.

The Review of Scientific Instruments
|December 3, 2016
PubMed
Summary

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

WebCat: the library catalogue on the world wide web.

Annals of the Royal College of Surgeons of England·2000
Same author

Mouse mammary tumor virus-Ki-rasB transgenic mice develop mammary carcinomas that can be growth-inhibited by a farnesyl:protein transferase inhibitor.

Cancer research·2000
Same author

Importance of phenylalanine 107 in agonist recognition by the 5-hydroxytryptamine(3A) receptor.

Molecular pharmacology·2000
Same author

Practical application of ergonomic settings of typical computerised workstations.

International journal of occupational safety and ergonomics : JOSE·2000
Same author

Structural basis of DOTMA for its high intravenous transfection activity in mouse.

Gene therapy·2000
Same author

The RIP-like kinase, RIP3, induces apoptosis and NF-kappaB nuclear translocation and localizes to mitochondria.

FEBS letters·2000

A new solid-state neutral particle analyzer (SSNPA) diagnostic was tested on the National Spherical Torus Experiment-Upgrade, providing detailed fast-ion measurements. The SSNPA effectively detected particle losses during sawtooth events and observed fluctuations linked to magnetohydrodynamics instabilities.

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic instrumentation

Background:

  • Fast-ion behavior is crucial for understanding plasma confinement in fusion devices.
  • Existing diagnostics have limitations in spatial, temporal, and pitch-angle resolution.
  • Neutral particle analyzers are key for measuring fast-ion distributions via charge exchange.

Purpose of the Study:

  • To test a compact, multi-view solid-state neutral particle analyzer (SSNPA) diagnostic.
  • To evaluate the SSNPA's capability for spatially, temporally, and pitch-angle resolved fast-ion measurements.
  • To assess SSNPA performance on the National Spherical Torus Experiment-Upgrade.

Main Methods:

  • Utilized three 16-channel subsystems (t-SSNPA, r-SSNPA, p-SSNPA) with varying viewing geometries and filter thicknesses.

Related Experiment Videos

  • Detected fast neutral flux from charge exchange (CX) reactions during neutral beam modulation.
  • Analyzed active and passive CX signals to differentiate particle populations and energy information.

    • Main Results:

    • All SSNPA channels were operational with a signal-to-noise ratio typically >10, primarily limited by X-ray induced noise.
    • Clear observation of active and passive CX signals during neutral beam modulation.
    • Identified significant losses of passing particles during sawtooth events, with minimal impact on trapped particles.
    • Observed fluctuations up to 120 kHz correlated with magnetohydrodynamics instabilities.

    Conclusions:

    • The solid-state neutral particle analyzer (SSNPA) is a viable diagnostic for fast-ion measurements in fusion plasmas.
    • SSNPA data reveal insights into fast-ion transport and losses, particularly during plasma instabilities like sawteeth.
    • The diagnostic successfully captured high-frequency fluctuations linked to magnetohydrodynamics, enhancing plasma behavior understanding.