From several years now at CEA/Saclay has been lunched a program that aims at developing design tools and technologies for conduction-cooled MgB2 magnets. In the framework of this program, a device for investigating the circumferential strain dependence of the critical current density in MgB2 wires and tapes has been designed. It has to be integrated into the existing test facility which...
A prototype of multifunction test facility for providing cryogenic-electro- magneto-mechanical multi-fields to investigate the field-dependence properties of superconducting wires/tapes is recently constructed in our laboratory. The apparatus is self-designed with several relatively independent sub-systems. A superconducting racetrack magnet made of NbTi/Cu is used to generate a background...
The NICA accelerator complex is being constructed in JINR, Dubna. It includes Electron String Ion Source, 6.2 Mev/u linac, 600 MeV/u booster synchrotron and collider. The booster will accumulate 4·109 Au32+ ions, accelerate heavy ions from 6.2 up to 600 MeV/u for Au32+ and form required beam emittance with the help of electron beam cooling. The cryogenic...
This paper presents a Rogowski coil which is utilized to accurately measure the current value in second-generation (2G) high temperature superconducting (HTS) coil in cryogenic environment. We demonstrate the structure and key materials of this Rogowski coil. To ensure the accuracy measurement of superconducting current in cryogenic temperature, this Rogowski coil is fabricated into closed and...
Advances in the performance of LTS and HTS superconductors enable the development of advanced magnets for a range of applications, including tokamaks for fusion energy, dipoles and quadrupoles for hadron colliders, and solenoids for nuclear magnetic resonance studies. The capability of testing prototype cables and insert coils at high field is critical to these developments. We present here...
REBCO coated conductors has a layer structure composed of Cu, Ag, GdBCO, MgO and Hastelloy substrate. Although the REBCO conductors enables high field magnet designs, their critical current properties are sensitive to mechanical stress. Especially, the thermal stresses in the cooling process of the REBCO magnets may cause the delamination of the layer structure of the REBCO conductor. This...
The solenoids are widely used both in conventional magnets and superconducting magnets in the particle accelerators. The longitudinal fields along longitudinal direction of the solenoids are usually measured with the Hall probe measurement system. However, in some cases, the deviation between magnetic center and mechanical center of solenoid is another important parameter and has to be...
A new proton therapy facility (HTPTF) is under construction in Wuhan, China. The dipole magnet integral measurement system was designed for the beam transport system of the HTPTF. The design goal is to build a reliable, precise, automatic measurement system, and it is accurate enough to characterize the magnetic field quality of the dipole magnets in the beam transport system. The integral...
A no-insulation (NI) winding technique is very promising to conduct a practical use of REBCO pancake coils by greatly enhancing the thermal stability. Many applications using the NI technique have been developed or constructed, such as a magnetic separation, a 1.3-GHz NMR, an over 40-T magnet, etc. So far, a lot of measurement data proved a high thermal stability of test magnets through...
The Normal Zone Propagation Velocity (NZPV) and quench are areas of intense research for High Temperature Superconductors (HTS). While normal zones travel with speeds in the order of magnitude of m/s in Low Temperature Superconductors (LTS), in HTS coated conductors this speed is in the order of cm/s. This makes ensuring a quick and uniform quench, and thereby the cryostability of tapes,...
Identifying the location of an electrical fault (mainly short-circuit or circuit break) in close systems like superconducting magnet is very difficult especially when a problem appears only at cold conditions (no resistance). The Time Domain Reflectometry (TDR) method could be useful notwithstanding that there is commonly known limitation on the use of TDR to test the inductive circuit results...
A few hundred temperature sensors are used to control the temperature behaviour of the gigantic ATLAS toroid superconducting magnet system during cool down and normal operation. In order to guarantee good sensitivity of temperature measurements in the range from liquid helium to room temperature, two types of sensors are positioned at the same location: platinum resistance thermometers for the...
The Mu2e experiment at Fermilab is designed to search for charged-lepton flavor violation by looking for muon to electron conversions in the field of the nucleus. The concept of the experiment is to generate a low momentum muon beam, stopping the muons in a target and measuring the momentum of the conversion electrons. The implementation of this approach utilizes a complex magnetic field...