TY - JOUR
T1 - Effective Time Constants at 4.2 to 70 K in ReBCO Pancake Coils with Different Inter-Turn Resistances
AU - Nes, T. H.
AU - De Rijk, G.
AU - Kirby, G.
AU - Pincot, F. O.
AU - Liberadzka-Porret, J.
AU - Petrone, C.
AU - Richter, S. C.
AU - Van Nugteren, J.
AU - Kario, A.
AU - Ten Kate, H.H.J.
N1 - Publisher Copyright:
© 2002-2011 IEEE.
PY - 2022/6/1
Y1 - 2022/6/1
N2 - For future ReBCO tape based accelerator magnets it is proposed to use no- or partial inter-turn insulation to deal with quench detection and protection. In a non-insulated coil the turns are separated by a finite electrical resistance, providing a bypass for the current at hot-spots, improving thermal stability and quench detection time. However, such coils show different dynamic electromagnetic behavior compared to insulated coils under normal charging and transient quench conditions. To study such coils in detail two pancake coils, one dry-wound and one with solder in between turns, are prepared and tested in a variable temperature cryostat between 4.2 and 70 K. Properties of the coils that are studied are charge and discharge time behavior, turn-to-turn resistance, response to current stepping, and operational stability. In this paper, the first results are presented and compared to a simplified network model in order to gain further understanding into the underlying physics.
AB - For future ReBCO tape based accelerator magnets it is proposed to use no- or partial inter-turn insulation to deal with quench detection and protection. In a non-insulated coil the turns are separated by a finite electrical resistance, providing a bypass for the current at hot-spots, improving thermal stability and quench detection time. However, such coils show different dynamic electromagnetic behavior compared to insulated coils under normal charging and transient quench conditions. To study such coils in detail two pancake coils, one dry-wound and one with solder in between turns, are prepared and tested in a variable temperature cryostat between 4.2 and 70 K. Properties of the coils that are studied are charge and discharge time behavior, turn-to-turn resistance, response to current stepping, and operational stability. In this paper, the first results are presented and compared to a simplified network model in order to gain further understanding into the underlying physics.
KW - High-temperature superconductors
KW - Network model
KW - ReBCO
KW - Superconducting coils
KW - Time constant
KW - 22/2 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85124719414&partnerID=8YFLogxK
U2 - 10.1109/TASC.2022.3148968
DO - 10.1109/TASC.2022.3148968
M3 - Article
AN - SCOPUS:85124719414
VL - 32
JO - IEEE transactions on applied superconductivity
JF - IEEE transactions on applied superconductivity
SN - 1051-8223
IS - 4
M1 - 4600806
ER -