TY  - JOUR
AU  - Wei, Yanling
AU  - Liu, Liang
AU  - Yu, Deliang
AU  - von Hellermann, Manfred
AU  - Chen, Wenjin
AU  - Wang, Jie
AU  - Ma, Qian
AU  - He, Xiaoxue
AU  - He, Xiaofei
TI  - Analysis of HL-2A charge exchange spectra using parallel genetic algorithm
JO  - Fusion engineering and design
VL  - 168
SN  - 0920-3796
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2021-05657
SP  - 112680 -
PY  - 2021
N1  - kein Zugriff auf Postprint
AB  - In this work, we present a new method based on parallel genetic algorithm (GA) for in-between shot data analysis of the Charge-Exchange (CX) spectra on the HL-2A tokamak. The neutral beam induced active CX spectra is a powerful ion diagnostic technique to provide spatially resolved ion temperature and rotation velocity measurements on fusion devices. Currently CX spectra obtained in HL-2A experiments are mainly analyzed by the CXSFIT code [A. D. Whiteford, et.al, 2007]. While the analysis itself is fast, its accuracy relies on proper setup of the initial values for the spectral fitting parameters. Time-consuming manual interventions are needed. In the new parallel GA code, a two-loop GA analysis is used to gradually update the fitting parameter search ranges, which enables automatic analysis. A parallel algorithm based on the Linux Message Passing Interface (MPI) cluster is adapted to speed up the process. In a test run, for a set of 1600 data slices, the total time elapsed with 8 CPU nodes is about 310 s (0.2 s per data slice), which is efficient for in-between shot analysis on HL-2A. The uncertainty calculations using virtual CX signals with a noise level up to 5% show that the accuracies for ion temperature and rotation velocity are better than 10.14% and 2.14%, respectively. The ion temperature and rotation velocity obtained by applying the new parallel genetic algorithm on experimental CX data show good agreement with the conventional CXSFIT results.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000670075800010
DO  - DOI:10.1016/j.fusengdes.2021.112680
UR  - https://juser.fz-juelich.de/record/904087
ER  -