title: Analysis of uncertainty in equilibrium reconstruction in the EAST superconducting tokamak.
abstract: The analysis of uncertainties of magnetic measurements in equilibrium reconstruction is carried out on the EAST (Experimental Advanced Superconducting Tokamak) tokamak. It is shown that uncertainties of magnetic diagnostics are about 0.2% and 10 mWb for flux loops and 0.6% and 20 G for magnetic probes. Analyzing the sensitivity of the magnetic data uncertainty in the plasma shape reconstruction is presented, based on EFIT fixed boundary and fitting mode and applying overall uncertainty as fitting weight in EFIT. It is found that reconstruction uncertainties are ranged in 0.5-1.4 cm for 6 control segments, less than 0.8 cm for X-points, and 1.0-1.6 cm for strike points with 95% confidence, in the last experimental campaign on the EAST tokamak.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei 230031, People's Republic of China.
authors.forename: G J
authors.initials: GJ
authors.lastname: Liu
authors.forename: B N
authors.initials: BN
authors.lastname: Wan
authors.forename: Y W
authors.initials: YW
authors.lastname: Sun
authors.forename: B J
authors.initials: BJ
authors.lastname: Xiao
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: Zh P
authors.initials: ZhP
authors.lastname: Luo
authors.forename: J P
authors.initials: JP
authors.lastname: Qian
authors.forename: D M
authors.initials: DM
authors.lastname: Liu