Density reconstruction of inhomogeneous dense DT plasmas is studied with simultaneous iterative reconstruction technique(SIRT).In simulation of density diagnostics of a two-dimensional(2D) slice plasma,fast protons used fordiagnostics can be generated with laser-plasma interaction and energy loss of fast protons going through plasmas is crucial.As original and final energies of protons are given,density reconstruction by SIRT method is done without noise level of final energies.Accuracy of the method is better than that of the Tikhonov regularization method based on deviation principle of L-curve.In addition,the SIRT method is available with incomplete data.

This paper caculated the highly excited states with J=2 and odd parity of the beryllium isoelectronic sequence by using the eigenchannel quantum defect theory (EQDT).It obtained the EQDT parameters U_iα and μ_α,of Be like systems from BeⅠ to OⅤ,as functions of effective nuclear charge.These results indicate that the differences between eigenquantum defects of different channels,which characterize the channel interactions,gradually diminish along this sequence.This isoelectronic behaviour is caused by the competition between electronic and spin orbit interaction along the evaluated with EQDT parameters as input.As a numerical example,the Lu Fano plots of BeⅠ is given as wall.

The program for computing EQDT parameters is achieved by using the program source ready in original MCHF package on basis of the eigen-channel quantum defect theory with electrostatic and spin-orbit interactions.