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A collimated neutron detector for RFP plasmas in MST.

W J Capecchi1, J K Anderson1, P J Bonofiglo1

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This summary is machine-generated.

A new neutron camera reconstructs plasma profiles in the Madison Symmetric Torus. This tool studies fast-ion pressure gradients, crucial for understanding Alfvénic mode instabilities and fast-ion transport in fusion plasmas.

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Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • Diagnostic Instrumentation

Background:

  • Understanding neutron emissivity profiles is key to studying fast-ion populations in fusion devices.
  • Fast-ion pressure gradients are implicated in destabilizing Alfvénic modes, which can transport fast ions.

Purpose of the Study:

  • To reconstruct the neutron emissivity profile in the Madison Symmetric Torus using a novel collimated neutron detector.
  • To investigate the fast-ion pressure gradient threshold for destabilizing neutral beam-driven Alfvénic modes.

Main Methods:

  • Utilizing a scintillator-photomultiplier tube (PMT) system with a defined plasma viewing aperture.
  • Employing high-density polyethylene for neutron moderation and a liquid scintillator for directional sensitivity.
  • Implementing fast preamplification and 500 MHz digitization to prevent pulse pile-up at high count rates.

Main Results:

  • Successfully developed and deployed a neutron camera system for emissivity profile reconstruction.
  • The system effectively detects fusion neutrons while mitigating gamma radiation interference.
  • The adjustable camera base allows for varied plasma viewing, essential for profile reconstruction.

Conclusions:

  • The reconstructed neutron emissivity profile provides direct insight into the fast-ion population.
  • This diagnostic capability enables the study of critical fast-ion pressure gradients and their relation to plasma instabilities.