DocumentCode :
55001
Title :
Test of the High-Field 
Dipole Magnet HD3b
Author :
Marchevsky, M. ; Caspi, S. ; Cheng, D.W. ; Dietderich, D.R. ; DiMarco, J. ; Felice, H. ; Ferracin, P. ; Godeke, A. ; Hafalia, A.R. ; Joseph, Jayaraj ; Lizarazo, J. ; Roy, Pallab Kanti ; Sabbi, G. ; Salmi, T. ; Turqueti, M. ; Wang, Xiongfei ; Prestemon, S.
Author_Institution :
Lawrence Berkeley Nat. Lab., Berkeley, CA, USA
Volume :
24
Issue :
3
fYear :
2014
fDate :
Jun-14
Firstpage :
1
Lastpage :
6
Abstract :
We report test results for the one meter long dipole HD3b, a block-type accelerator quality Nb3Sn magnet built at LBNL with operational bore fields in the range of 13-15 T. The magnet is an upgrade of the previously reported HD2 and HD3a versions, with several modifications implemented to improve conductor positioning, reduce cable “hard-way” bending radius, and strengthen electrical insulation between cables and coil parts. The magnet exhibited long training behavior, but showed a good “memory” of the trained state upon thermal cycling. Ramp-rate dependence of the quench current, field quality performance characteristics, and protection heater studies were conducted. Quench propagation velocity and quench locations were determined based on the voltage signals; quench localization was further improved using inductive quench antenna and acoustic emission sensors. Short- and long-term acoustic precursors to quenching were observed.
Keywords :
accelerator magnets; superconducting cables; superconducting coils; superconducting device testing; superconducting magnets; Nb3Sn; acoustic emission sensors; block-type accelerator quality magnet; cable hard-way bending radius; coil parts; conductor positioning; electrical insulation; field quality performance characteristics; high-field dipole magnet HD3b test; inductive quench antenna; long-term acoustic precursor; operational bore fields; protection heater; quench current; quench localization; quench locations; quench propagation velocity; ramp-rate dependence; short-term acoustic precursor; thermal cycling; trained state memory; training behavior; voltage signals; Coils; Magnetic field measurement; Magnetic flux; Magnetic separation; Magnetoacoustic effects; Superconducting magnets; Training; Accelerator magnets; field quality; quench diagnostics;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2013.2285881
Filename :
6634238
Link To Document :
