Abstract
The international Facility for Antiproton and Ion Research FAIR is currently under construction at GSI, in Darmstadt, Germany. The core component of FAIR, the superconducting SIS100 synchrotron will operate with a high repetition rate of up to 1 Hz. The SIS100 ring with a circumference of 1083 m contains 108 main dipole magnets with a maximal field of 1.9 T. The ion-optical lattice of SIS100 contains also 166 main quadrupoles and 137 corrector magnets. The quadrupole and corrector magnets are assembled in the quadrupole units that are pair-wise integrated in quadrupole doublet modules. All superconducting magnets will be tested at liquid helium temperature to assure their compliancy with the specification. The main dipole modules are being tested at the magnet test facility at GSI. Cold testing of the quadrupole doublet modules is split in the testing of the quadrupole units at JINR, Russia and in testing of fully assembled quadrupole doublet modules at INFN, Italy. The cold testing program includes dynamic AC loss measurements and hydraulic adjustment of the parallel cooling channels of SIS100 next to the training, magnetic field measurements and other tests. We present the scope of cold testing of different types of magnet modules as well as the test results.
Highlights
The superconducting synchrotron SIS100 is the core component of the FAIR accelerator complex which is being built at GSI, Darmstadt, Germany [1]
The criteria for the hydraulic adjustment have been chosen similar to the dipole magnets: Quadrupole and corrector magnets are ramped in reference cycle (Figure 2) The pressure drop is set to 0.55 bar The yoke outlet temperature must match the range between 5 K and 6 K (5.5 ± 0.5 K) Up to now two pre-series units have been tested [2]
The test program for quadrupole doublet modules does not include the powering of main quadrupole magnets and focuses on components which were not tested at JINR: mechanical interfaces, mechanical integrity and leak tightness at helium temperatures electrical integrity of the module, high voltage tests tests of instrumentation static heat load tests of 250 A current leads for corrector magnets tests of the beam vacuum system test of the beam position monitors tests of the cryo catchers After successfully passed Site Acceptance Tests (SAT) the doublet modules will be shipped to GSI for installation in the accelerator tunnel
Summary
The superconducting synchrotron SIS100 is the core component of the FAIR accelerator complex which is being built at GSI, Darmstadt, Germany [1]. SIS100 uses fast ramped superconducting magnets designed for the pulsed operation with the ramp up time of 0.5 s. Depending on the operating mode of the synchrotron the main dipole and quadrupole magnets will be cycled with a repetition frequency of up to 1 Hz. Dynamic heat losses caused by fast cycling will reach the values up to 35 W for the dipole magnets and 16 W for quadrupoles [2]. There will be 108 dipoles, 166 quadrupoles and 137 corrector magnets in the SIS100 ring (Table 1). High dynamic heat losses require cooling of coils and yokes with forced flow two-phase helium [3]
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