Design, Construction and Testing of a Multipole Wiggler Magnet Vacuum Chamber for the SLRI

This paper presents the design, construction and test of a prototype of a vacuum chamber for the SLRI multipole wiggler. With limitation of gap space, the thickness of the chamber has to be as thin as possible without any deformation. Therefore, the finite element method plays a vital role to perform mechanical stress and deformation simulation. 316L stainless steel has been used for this chamber in order to have a high mechanical strength and low magnetic permeability. The prototype was manufactured precisely in two halves with the dimension of 1325 mm in length and an internal aperture of 106 mm x 18 mm in horizontal and vertical axes, respectively. The wall thickness is 2 mm. The lateral duct is designed to be used as a pumping port connected to a sputtered ion pump. The chamber has been successfully tested at ultra high vacuum level of about 4 x 10-10 torr. Technical problems during construction of the chamber will be summarized.