Study of back quench in the superconducting coils of the barrel toroid of ATLAS due to losses during a “slow” discharge of the magnet

Author

Sorbi, Massimo

Author_Institution

LASA Lab., Ist. Nazionale di Fisica Nucl., Milan, Italy

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1681

Lastpage

1684

Abstract

An analysis of the losses in the Al matrix of the conductor and in the casings where the superconducting coils are located, due to a “slow discharge” (heaters of the coils off) of the Barrel Toroid of ATLAS has been carried out. The values of the losses have been calculated and cross checked by means of different analytical and FE approaches, and simple relations have been carried out in order to correlate them with the main electrical parameters of the magnet. With a thermal analysis, the increase of temperature in the superconducting coils due to these extra losses has been calculated. The temperature margin (i.e. difference between current sharing temperature and operating temperature) has been calculated and compared with the temperature margin during the normal run of the magnet

Keywords

accelerator magnets; colliding beam accelerators; superconducting coils; superconducting magnets; thermal analysis; ATLAS barrel toroid; Large Hadron Collider; back quench; current sharing temperature; losses; operating temperature; slow discharge; superconducting coils; temperature margin; thermal analysis; Conductors; Eddy currents; Large Hadron Collider; Magnetic analysis; Magnetic switching; Superconducting coils; Superconducting magnets; Switches; Temperature; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920105

Filename

920105