The functional test of the SIS300 model dipole at INFN-LASA

The FAIR facility, under construction at GSI, includes the synchrotron SIS300 (300 Tm rigidity). To reach the required high intensities of protons and heavy ion beams, the bending dipole magnets (beam tube diameter aperture 100 mm) have to be pulsed from the injection magnetic field of 1.5 T to the extraction field of 4.5 T at the rate of 1 T/s. The first 3.9-m-long model dipole has been built and the functional tests have been carried out at LASA Lab. These tests have been performed inside a vertical cryostat in boiling helium at 4.2 K, and they were aimed to verify the operation of the magnet, also in pulsed regime. The paper illustrates the commissioning activities of the test station and the results of the magnet tests. The performance of the magnet with respect to quench stability and heat losses in pulsed regime will be compared with the design values.