Test of the High-Field $\\hbox {Nb}_{3}\\hbox {Sn}$ 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

Test of the High-Field Dipole Magnet HD3b

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.

jour

Test of the High-Field $\\hbox {Nb}_{3}\\hbox {Sn}$ Dipole Magnet HD3b