Construction and tests of HCX quadrupole doublet for heavy ion beam transport experiments

A cryostat housing a pair of previously tested quadrupole magnets has been constructed as a prototype focusing cell for the High Current Experiment (HCX) project. The doublet assembly was constructed with a room temperature beam tube. The magnets were reassembled, electrically connected in series, and tested to the short sample limiting current without further training. The doublet was more sensitive to the current ramping rate as compare with the previous performance. In order to build a compact vacuum jacket for the warm bore structure, a novel radiation insulation made of aluminum coated stainless steel foil was selected. The experiences in assembly of the doublet and fabrication of the cryostat are described. The thermal performances of the cryostat are reported.