Abstract
Full function integrated, compact solid state neutral particle analyzers (ssNPA) based on absolute extreme ultraviolet silicon photodiode have been successfully implemented on the experimental advanced superconducting tokamak to measure energetic particle. The ssNPA system has been operated in advanced current mode with fast temporal and spatial resolution capabilities, with both active and passive charge exchange measurements. It is found that the ssNPA flux signals are increased substantially with neutral beam injection (NBI). The horizontal active array responds to modulated NBI beam promptly, while weaker change is presented on passive array. Compared to near-perpendicular beam, near-tangential beam brings more passive ssNPA flux and a broader profile, while no clear difference is observed on active ssNPA flux and its profile. Significantly enhanced intensities on some ssNPA channels have been observed during ion cyclotron resonant heating.
Highlights
Energetic particles (EPs) related to fusion reactions, neutral beam injection (NBI) and/or ion cyclotron resonant heating (ICRH) auxiliary heating, and magnetohydrodynamics (MHD) instabilities play a major role in tokamak hot plasma
Recent development on compact solid state neutral particle analyzers based on absolute extreme ultraviolet (AXUV) silicon photodiode5 are very attractive because they are small in size, simple to operate, and low cost
The full function integrated solid state neutral particle analyzers (ssNPA) system based on specially fabricated AXUV detectors with fast response and ultra-high vacuum (UHV) compatibility has been designed and installed for the first time on experimental advanced superconducting tokamak (EAST) in 2014,6 based on the experience obtained from previous individual development such as advanced current mode operation on DIII-D,7 coarse pulse height spectrum measurements on national spherical torus experiment (NSTX),8,9 and other devices
Summary
Energetic particles (EPs) related to fusion reactions, neutral beam injection (NBI) and/or ion cyclotron resonant heating (ICRH) auxiliary heating, and magnetohydrodynamics (MHD) instabilities play a major role in tokamak hot plasma. By measuring charge-exchange (CX) fast neutrals escaped from plasmas, neutral particle analyzer (NPA) is an essential tool for diagnosing and studying the important EP behaviors.. By measuring charge-exchange (CX) fast neutrals escaped from plasmas, neutral particle analyzer (NPA) is an essential tool for diagnosing and studying the important EP behaviors.. Recent development on compact solid state neutral particle analyzers (ssNPA) based on absolute extreme ultraviolet (AXUV) silicon photodiode are very attractive because they are small in size, simple to operate, and low cost.. The full function integrated ssNPA system based on specially fabricated AXUV detectors with fast response and ultra-high vacuum (UHV) compatibility has been designed and installed for the first time on experimental advanced superconducting tokamak (EAST) in 2014,6 based on the experience obtained from previous individual development such as advanced current mode operation on DIII-D,7 coarse pulse height spectrum measurements on national spherical torus experiment (NSTX), and other devices..
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