Design and fabrication of scan tube for field measurement of superconducting magnet of ion trap project at VECC Saha S.1, Ahammed M.1, Singh S.1, Hemram B.1, Rao Y.E.1, Mandai N.P.1, Gupta A. Dutta1, Chaudhury J.1, Roy A.1, Das P.1, Bhandari R. K.1 1VECC, Department of Atomic Energy, 1/AF, Bidhan Nagar, Kolkata, India, 700064 Abstract A 5T Superconducting magnet for Ion Tran project has already been designed, fabricated and installed at VECC. The magnetic field measurement of the superconducting magnet has to be carried out to estimate the spatial field uniformity which has to be less than 1 × 10−6 over 1 cm DSV. For facilitating the magnetic field measurement, a scan tube has been designed and fabricated to house a NMR probe that would be inserted in the liquid helium filled bore of the magnet. The materials and thicknesses of different components of the scan tube have been optimized so that around room temperature would be maintained inside the scan tube when dipped in the liquid helium filled bore of the magnet and the heat load of the system would be minimum. Presently the scan tube was fabricated and cryoshocking test at 77K had been performed before vacuum leak test was carried out and helium leak rate was found to be less than 5 × 10-9 mbar.lit/sec. This paper describes the design and fabrication of the scan tube in detail. Top Keywords Persistent mode superconducting magnet, Multilayer Insulation, NMR, DSV. Top |