Table 2 Standard deviations of the initial state distribution (\(\sigma _{\textrm{init}}\)) and system noise (\(\sigma _{Q}\)).

From: First application of data assimilation-based control to fusion plasma

Variable

\(\sigma _{\textrm{init}}\)

\(\sigma _{Q}\)

\(\tilde{\textbf{x}}\)

n

20%

2% (10%)

\(T_{\textrm{e}}\)

15%

2% (3%)

\(T_{\textrm{i}}\)

15%

2% (3%)

\(c_{\textrm{e}}\)

0.2

0 (0.1)

\(c_{\textrm{i}}\)

0.2

0 (0.1)

\(\textbf{u}\)

\(P_{\textrm{ECH}}\)

0

0.5 (0)

  1. The values in parentheses represent the additional system noise added after the y-filter. The values with% as the unit represent the rate for determining the standard deviation in proportion to the state distribution mean.