Retraining of the 1232 Main Dipole Magnets in the LHC

Conference · Tue Jan 05 00:00:00 EST 2016 · IEEE Trans.Appl.Supercond.

DOI:https://doi.org/10.1109/TASC.2016.2514598· OSTI ID:1247526

Verweij, A. ^[1]; Auchmann, B.; Bednarek, M.; Bottura, L.; Charifoulline, Z.; Feher, S. ^[2]; Hagen, P.; Modena, M.; Le Naour, S.; Romera, I.; Siemko, A.; Steckert, J.; Tock, J. Ph; Todesco, E.; Willering, G.; Wollmann, D.

---

1. CERN
2. Fermilab

The Large Hadron Collider (LHC) contains eight main dipole circuits, each of them with 154 dipole magnets powered in series. These 15-m-long magnets are wound from Nb-Ti superconducting Rutherford cables, and have active quench detection triggering heaters to quickly force the transition of the coil to the normal conducting state in case of a quench, and hence reduce the hot spot temperature. During the reception tests in 2002-2007, all these magnets have been trained up to at least 12 kA, corresponding to a beam energy of 7.1 TeV. After installation in the accelerator, the circuits have been operated at reduced currents of up to 6.8 kA, from 2010 to 2013, corresponding to a beam energy of 4 TeV. After the first long shutdown of 2013-2014, the LHC runs at 6.5 TeV, requiring a dipole magnet current of 11.0 kA. A significant number of training quenches were needed to bring the 1232 magnets up to this current. In this paper, the circuit behavior in case of a quench is presented, as well as the quench training as compared to the initial training during the reception tests of the individual magnets.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1247526
• Report Number(s): FERMILAB-CONF-15-635-TD; 1423499
• Journal Information: IEEE Trans.Appl.Supercond., Vol. 26, Issue 4
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS