title: Bayesian tomography and integrated data analysis in fusion diagnostics.
abstract: In this article, a Bayesian tomography method using non-stationary Gaussian process for a prior has been introduced. The Bayesian formalism allows quantities which bear uncertainty to be expressed in the probabilistic form so that the uncertainty of a final solution can be fully resolved from the confidence interval of a posterior probability. Moreover, a consistency check of that solution can be performed by checking whether the misfits between predicted and measured data are reasonably within an assumed data error. In particular, the accuracy of reconstructions is significantly improved by using the non-stationary Gaussian process that can adapt to the varying smoothness of emission distribution. The implementation of this method to a soft X-ray diagnostics on HL-2A has been used to explore relevant physics in equilibrium and MHD instability modes. This project is carried out within a large size inference framework, aiming at an integrated analysis of heterogeneous diagnostics.
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Dong
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Deng
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Z B
authors.initials: ZB
authors.lastname: Shi
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: B Z
authors.initials: BZ
authors.lastname: Fu
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: J M
authors.initials: JM
authors.lastname: Gao
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: T B
authors.initials: TB
authors.lastname: Wang
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Q W
authors.initials: QW
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: X R
authors.initials: XR
authors.lastname: Duan