Coupling Current and AC Loss in LHC Superconducting Quadrupoles

One of the issues for the operation of the LHC accelerator at CERN are the field errors generated by coupling currents in the superconducting cables of the main dipoles and quadrupoles, especially during the initial phase of the energy ramp from injection conditions. Coupling current effects have al...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2008-06, Vol.18 (2), p.108-111
Main Authors: Di Castro, M., Bottura, L., Richter, D., Sanfilippo, S., Wolf, R.
Format: Article
Language:English
Subjects:
Applied sciences
Cables
Current measurement
Cyclic accelerators and storage rings
Dipoles
Dispersion
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Electrical resistance measurement
Electromagnets
Energy measurement
Errors
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Joining
Large Hadron Collider
Loss measurement
Magnetic field measurement
Magnets
Nuclear physics
Performance evaluation
Physics
Quadrupoles
Ramps
Superconducting cables
Superconducting magnets
Superconductivity
Various equipment and components
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Description
Summary:One of the issues for the operation of the LHC accelerator at CERN are the field errors generated by coupling currents in the superconducting cables of the main dipoles and quadrupoles, especially during the initial phase of the energy ramp from injection conditions. Coupling current effects have already been measured in the superconducting dipoles, and results are reported elsewhere. This paper reports similar measurements that we have recently performed on different types of LHC superconducting quadrupoles (arc quadrupole, dispersion suppressor and matching section quadrupoles) to quantify the above effects and compare them to the values specified from the beam tolerances. Loss and field errors due to ramping are mainly determined by the contact resistance between the strands of the magnets cables. In this paper the is calculated for several quadrupoles measured using both the measured energy loss and the magnetic field errors during ramping of magnets.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2008.921305