Measurements of neutral particle energy spectrum on EAST using a time-of-flight low-energy neutral particle analyzer

N X Liu; L Mu; R Ding; Y B Zhu; S Li; H Xie; R Yan; J Peng; J L Chen

doi:10.1063/5.0043769

Measurements of neutral particle energy spectrum on EAST using a time-of-flight low-energy neutral particle analyzer

Rev Sci Instrum. 2021 Jun 1;92(6):063507. doi: 10.1063/5.0043769.

Authors

N X Liu¹, L Mu¹, R Ding¹, Y B Zhu², S Li¹, H Xie³, R Yan¹, J Peng¹, J L Chen¹

Affiliations

¹ Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
² Hebei Key Laboratory of Compact Fusion, Langfang 065001, China.
³ Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China.

PMID: 34243563
DOI: 10.1063/5.0043769

Abstract

The neutral particles generated by charge exchange reactions can play an important role in erosion of first wall materials in fusion devices. In order to measure the flux and energy of neutral particles to the first wall, a low-energy neutral particle analyzer (LENPA) based on the time-of-flight method has been developed and successfully applied on the Experimental Advanced Superconducting Tokamak (EAST)' to measure the neutrals with an energy of 20-3000 eV. The LENPA works in the counting mode, and the signal of photons is used as the reference for the flight time of neutrals. The energy spectrum of low-energy neutral particles on EAST has been obtained for the first time. The new diagnostics can help in understanding the neutral particle generation and deposition on the first wall materials in tokamaks under different plasma conditions.