Chenxing Li

Crystallization of PbxSr1-x(NO3)(2) solid solutions from aqueous solutions

A series of PbxPr1-x(NO3)(2) crystals have been grown from aqueous solutions and characterized by X-ray powder diffraction. All diffraction data were well indexed according to the simple cubic structure. The variation of lattice constants with the concentrations of Pb2+ in the crystals accorded quite well to the Vegards Law. The composition of the Sr(NO,), crystal doped with Pb2+ was studied by electron microprobe and it was found that Pb2+ was enriched in the 111 sectors. Equilibrium behavior in the Pb(NO3)(2)-Sr(NO3)(2)-H2O system was analyzed by Lippmanns phase diagram and the equilibrium distribution coefficient D-ph = 133.6. This large value of D indicates that Pb2+ ion is preferentially distributed to the solid phase.

Development and test of ADS injector II RFQ accelerator

The injector II RFQ accelerator of ADS is used to accelerate protons of 10 mA from 35 keV to 2.1 MeV. The cavity structure of the RFQ is the same as that of the SNS RFQ which has a square cross section, and it adopts π-mode rods to enhance the RF (radio frequency) stability of the cavity. Low power tests show that the flatness of the cavity is better than ±0.01 and the unloaded Q value is 13000. CW (continuous wave) working condition was realized after a long time conditioning of the cavity. Beam tests were conducted with a current of 10 mA in pulse mode and CW mode, respectively, and it indicates that the transmission efficiency is 95.3%, output energy is 2.165 MeV, energy spread is 1.9%, and the transverse and longitudinal emittances are all 0.33 πmm·mrad. ©, 2015, Atomic Energy Press. All right reserved.