Abstract: The high luminosity upgrade of the Large Hadron Collider (LHC) at CERN will consist of Nb3Sn based superconducting magnets operating at about 22kA DC. When these magnets quench, the power source has to be disconnected and stored energy should be discharged into a dump resistor very quickly. For this purpose, a 24kA DC current interruption switch based on Insulated Gate Bipolar...
INFN developed at LASA lab (Milano, Italy) a fast current switch in the framework of the EuCARD-2 project. A full prototype of a 10 kA fast switch based on insulated gate bipolar transistor (IGBT) modules operating in about 1 ms has been developed, installed and tested in the existing power supply at LASA lab. The upgraded power supply is meant to operate on the EuCARD-2 high temperature...
The co-wound voltage tap sensor is considered suitable to pulse operation superconducting coil quench detection but it has a fatal weak point.There is no way to repair it in case of sensor failure, since the co-wound sensor will be embedded inside the coil. A novel quench detection method is presented in this paper to detect a quench using radio frequency wave technology.The RF detection...
A novel quench detector and post-mortem system for superconducting insertion devices are developed. This module consists of two functional components: quench detection and output latch signals for interlock purpose, which is based on field-programmable gate array, and a data acquisition system based on a set of simultaneous sampling ADC modules. The data acquisition system has two concurrent...
Generally quench detection of high temperature superconducting (HTS) magnet is difficult compared with low temperature superconducting (LTS) magnet. Because normal zone propagation (NZP) velocity of HTS is slower than LTS. In order to detect the quench signal for HTS magnet, signal wires for voltage taps are needed. However, owing to its slow NZP velocity, the quench signal of HTS magnet is...
High temperature superconducting magnets (HTS) suffer from slow quench propagation, have high thermal margin, and consequently require external energy extraction for quench protection. This is especially the case with such accelerator magnets where most of the magnet volume operates far away from its critical surface. Quench heaters and CLIQ, as the most promising quench protection systems...
One promising new application for optical fiber sensors is in monitoring superconducting magnets that are, inevitably, operated at cryogenic temperatures. In fact, Rayleigh backscattering interrogated optical fibers have been shown to be a viable alternative to voltage taps in quench detection of high temperature superconductors. The cryogenic thermal sensitivity of commercially available...
The KSTAR CS coil needs an active quench detection system, where the primary one is the resistive voltage detection. The system should operate with two basic requirements, which are almost infallible quench detection and minimization of fake quench alarms. However, the inductive voltage, which is generally much higher than the resistive voltage caused by quench, can trigger the fake quench...
A new method of the Quench Detection Systems (QDS) designed for the LHC 600 A corrector magnet circuits and 6 kA Individual Powered Quadrupole (IPQ) magnet circuits is presented. In order to improve the dependability of QDS a direct measurement of the power converter current derivative is proposed. Actually, the quench detection scheme for the 600 A corrector magnet circuits uses the current...
Quench detection is important for the application of the high-temperature superconducting (HTS) tape, especially REBCO tape. However, there is a serious issue that voltage drop is too small to detect quench due to the small normal zone propagation velocity (NZPV) in HTS. To address this issue, we have proposed a quench detectable LTS/HTS hybrid tape consisting of the low-temperature...
Quench protection is one critical problem for superconductor magnet applications. The most common way to deal with quench in magnets is to disconnect and quickly discharge the magnet to prevent damage. In this research a novel proposal concerning quench protection for an SMES wound using YBCO conductor is presented. The new method can provide high reliability of SMES magnet. Based on this...
A general understanding of training quenches in Nb3Sn superconducting coils is that they are predominantly caused by settling of the coil while increasing the force in the magnet during current ramp up. In most cases, voltage measurements show precursors that can indicate the magnitude of movement. Three types of movement detection methods were combined in recent tests of Nb3Sn model magnets:...
In recent years, magnesium diboride (MgB2) has been regarded as one of the promising candidates for the development of MRI magnets owing to its critical temperature of 39 K, which allows magnets to be operated without the use of liquid helium (LHe), unlike their low-temperature superconductor counterparts. Prior to the development of the LHe-free MgB2 MRI magnet, it is essential to investigate...
The neutrino mass experiment KATRIN recently operated its complete chain of the superconducting magnets for the first beam test. A Magnet safety system (MSS) for the 16 m long source magnet system has been installed for quench detection and protection of the superconducting magnets. They are cooled by a liquid helium bath at 4.5 K. The magnet system consists of seven main superconducting...
Lawrence Berkeley National Laboratory (LBNL) in collaboration with the Institute of Modern Physics (IMP) is developing a Nb3Sn based superconducting magnet system for a fourth-generation ECR source, with a goal of achieving the field required for operating at the microwave frequency of 45 GHz. The magnet system is composed of one sextupole magnet and three solenoids of different sizes...
This paper discusses the design of the quench protection for a conduction-cooled MgB2 magnet system that will be used for magnetic density separation (MDS). First, an extensive literature review is made of currently available quench detection and - protection methods, which are discussed in a structured way in terms of merrits and challenges. Next, the measured normal zone propagation...
The development of second generation (2G) high temperature superconductor (HTS) wires has allowed for achieving performance levels that are suitable for numerous applications and allow for the generation of the high magnetic field required in applications like future particle colliders. In fact, 2G HTS technology is currently being employed in fault current limiters (FCLs), energy storage...
The energy efficiency of novel high temperature superconductor (HTS) direct current (DC) induction heating method can approach to 90%, due to the loss-free of superconducting coil in DC operation. Now a MW-scaled HTS DC induction heater is designed and manufactured. The magnet is coulped with iron core, which helps to guide the magnetic flux and generate more suitable magnetic field for...