NDLI: Quench Limit Model and Measurements for Steady State Heat Deposits in LHC Magnets

Content Provider	IEEE Xplore Digital Library
Author	Bocian, D. Dehning, B. Siemko, A.
Copyright Year	2002
Abstract	A quench, transition of a conductor from the superconducting to the normal conducting state, occurs irreversibly in accelerator magnets if one of the three parameters: temperature, magnetic field or current density, exceeds its critical value. The protons lost from the beam and impacting on the vacuum chamber, create a secondary particle shower that deposes its energy in the magnet coil. Energy deposited in the superconductor by these particles can provoke quenches that can be detrimental for the accelerator operation. A network model is developed to study the thermodynamic behavior of the LHC magnets. The results of the heat flow simulation in the main dipole and quadrupole LHC magnets calculated by means of the network model were validated with measurements performed at superfluid helium temperatures in the CERN magnet test facility. A steady state heat flow was introduced in the magnet coil by using a dedicated internal heating apparatus (IHA) installed inside the magnet cold bore. The value of the heat source flux flow is determined from the network model. The magnet coil current, which is required to quench the magnet coil, is predicted accordingly.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2446
Ending Page	2449
Page Count	4
File Size	927397
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Steady-state Large Hadron Collider Magnetic field measurement Superconducting magnets Superconducting coils Conductors Accelerator magnets Superconducting transition temperature Current density Protons steady state heat deposits Heat transfer LHC superconducting magnets quench level calculations quench level measurements quench limit
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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