Description
Session 2 - Stability and Quench
-
Mr Willem Michiel De Rapper (CERN)12/10/2011, 14:30In light of the ongoing conductor research at CERN for the planned LHC upgrades, minimum quench energy (MQE) of the latest Nb3Sn conductors is investigated using spot heaters. These conductors are used in high field accelerator magnets, which are prone to training quenches emanating from small energy depositions (wire movement, epoxy cracks) in the conductor during ramps. To improve the...Go to contribution page
-
Daniel Molnar (CERN)12/10/2011, 15:00A defective bus connection between two dipole magnets was the primary cause of the 2008 September incident in the LHC. This led to the decision that all ten thousand dipole and quadropole bus joints will be improved to avoid the reoccurrence of such an event. The purpose of the present work is to support the design choices and quality control of the shunts. In order to achieve high...Go to contribution page
-
Mr Pier Paolo Granieri (CERN, Geneva & EPFL Lausanne, Switzerland)12/10/2011, 15:30The operation of the Large Hadron Collider (LHC) calls for a better understanding of the thermo-electric behavior of the 13 kA superconducting bus bars interconnecting its main magnets. A deep insight of the stability of the bus bars interconnections is required to ensure the protection of the accelerator against undesired effects of resistive transitions. This is especially important in case...Go to contribution page
-
Sylvie Nicollet (CEA/IRFM Saint-Paul-lez-Durance 13108 France)12/10/2011, 16:15The 6 ITER Poloidal Field Coils are wound in double pancakes (DP) using two-in-hand large NbTi Cable-In-Conduit Conductors (CICC) with a central channel. All pancakes are cooled in parallel. The helium inlets are located at the innermost turns whereas the helium outlet (in the electrical joints) are locate at the outer radius. For a each PF coil winding, a simplified rectangular cross-section...Go to contribution page
-
Ms Tiina Salmi (Lawrence Berkeley National Laboratory)12/10/2011, 16:45Reliable quench protection of long high-field Nb3Sn accelerator magnets requires optimization of the present state-of-the-art protection heater technology. The heater geometry and materials must be designed to provide enough multiple normal zones along the winding to ensure fast and uniform dissipation of the stored magnetic energy. At the same time, voltages in the windings and heater...Go to contribution page
-
Claudio Marinucci (EPFL-CRPP)12/10/2011, 17:15The design of the quench protection system for a superconducting solenoid for laboratory applications is a practical matter that has often been addressed by using simplified models based on analytical estimates for the quench propagation velocities in the longitudinal (along the conductor) and transverse (from turn to turn) directions. This approach can become cumbersome, especially for coil...Go to contribution page
-
Dr Chantal MEURIS (CEA Saclay)13/10/2011, 08:30Experimental and numerical studies have been conducted with the aim of modeling pressure rises which occur in the helium, during quenches of the 11.7-T superconducting magnet named Iseult. Iseult is based on double pancake winding internally cooled by superfluid channels opening into a pressurized He II bath at 1.8 K. A scale mock-up has been built of 10 copper equivalent pancake slices and 7...Go to contribution page
-
Dr Andrey Gavrilin (National High Magnetic Field Laboratory of Florida State University, USA)13/10/2011, 09:00The current state of the art in computer simulation of quench in pool-cooled superconducting magnets, particularly in those consisting of many coils/sections, is viewed. The discussion is mostly about up-to-date solenoid closely-packed epoxy-impregnated LTS high-current-density windings, albeit not only about them. The approach to computer modeling of a quench event is considered in comparison...Go to contribution page