Conveners
Tue-Af-Po2.19 - Losses in Conductors and Coils II
- Mike Sumption (The Ohio State University)
- Francesco Grilli (Karlsruhe Institute of Technology)
AC loss is one of the important considerations in the design and operation of high temperature superconducting (HTS) devices. Traditional method to measure AC loss generated in HTS coil is to measure the coil voltage’s resistive component by using a lock-in amplifier. This method has several limitations during application. In order to solve these problems, integration method and energy...
In a high-temperature superconducting (HTS) multi-layer AC cable, the HTS tapes of one layer are twisted cylindrically, an AC transport current is provided, and the cable is exposed to an AC magnetic field produced by the other layers. The magnetic field consists of a circumferential magnetic field and a longitudinal magnetic field. The circumferential magnetic field is produced by a transport...
The long-life driving coil is the prerequisite for Electromagnetic forming industrial application, so far, the temperature rise is one of the major factors that restraint its working life. This paper proposes a new coupling cooling method of driving coil by placing extra cooling coil with timing control system on the other side, which can reduce the Joule heating and temperature rise of the...
The Super High Momentum Spectrometer (SHMS) of Hall C, part of the recent 12 GeV accelerator Upgrade at Jefferson Lab, was successfully commissioned in 2017. During pre-commissioning, fast dumps of the SHMS Q2/Q3 quadrupole and Dipole superconducting magnets experienced some level of operational difficulty. Measurements and analyses demonstrate that the fast discharge caused fast current...
Copper losses and iron losses are the two most significant losses in electrical machines. The iron loss is a large portion of the total losses, and it mainly influences efficiency. The copper losses are relatively easy to calculate and it will be negligible if current is too small; on the other hand, the calculation methods of iron losses are more complicated than the copper loss calculation....
During operation, AC loss of central solenoid (CS) coils can be quite significant. From cryogenic point of view, CS coils, made of cable-in-conduit conductors (CICC’s), can be regard as porous pipes. A common way to estimate the heat generated by AC loss is from a difference in the enthalpy flow between the inlet and outlet. In actual cases, offsets in the enthalpy flow difference commonly...
Abstract—Conductor-on-round-core (CORC) cable, which is helically wounded by YBCO coated conductors, has become a promising candidate conductor for high temperature superconducting (HTS) applications, such as superconducting magnets and electric machines. Understanding the mechanism and magnitude of AC loss is extremely critical for the design of CORC cable. Dynamic resistance has been...
Understanding AC loss in High Temperature Superconductor (HTS) magnets is critical to application. The common methods for AC loss measurement are electrical and calorimetric measurements. It is generally accepted that calorimetric techniques are superior to electrical methods when there is a phase difference between the transport current and external magnetic field. A common challenge in...
We have been studying the potential of energy consumption reduction in rapid cycling synchrotrons (RCSs) by using superferric magnets with high temperature superconductor (HTS) coils. In our previous research, we developed a three-dimensional electromagnetic field analysis model for superferric magnets, and analyses were conducted on superferric magnets in several kinds of RCSs designed for...
