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Installation of a solid state neutral particle analyzer array on mega ampere spherical tokamak upgrade.
Rev Sci Instrum
November 2022
University of California Irvine, Irvine, California 92697, USAUKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United KingdomGeneral Atomics, San Diego, California 92186, USAUniversity of California, Los Angeles, California 90095, USAUniversity of Durham, South Road, Durham DH1 3LE, United Kingdom.
Article Synopsis
- A compact solid-state neutral particle analyzer (SSNPA) diagnostic, originally used at NSTX-U, has been relocated to MAST-U and operated successfully during the first physics campaign.
- The SSNPA detects fast neutral particles from charge exchange reactions to analyze fast ion distribution, featuring three 16-channel sensors for radial plasma views with a resolution of 3-4 cm, 200 kHz temporal resolution, and a few degrees pitch angle resolution.
- Preliminary data indicates that all sensors are functioning as planned, with a signal-to-noise ratio around 15, and shows a correlation between SSNPA signals and magnetohydrodynamic activity in the plasma.