Publications (3)0 Total impact
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E Barbero-Soto,
B Bellesia,
Frederick Bordry,
M P Casas Lino,
G J Coelingh,
G Cumer,
K Dahlerup-Petersen,
J C Guillaume,
J Inigo-Golfin,
V Montabonnet, [......],
M Pojer,
R Principe,
F Rodríguez-Mateos,
R Saban,
R Schmidt,
H Thiesen,
A Vergara-Fernández,
M Zerlauth, A Castaneda Serra,
I Romera Ramirez
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ABSTRACT: For the two counter rotating beams in the Large Hadron Collider (LHC) about 8000 magnets (main dipole and quadrupole magnets, corrector magnets, separation dipoles, matching section quadrupoles etc.) are powered in about 1500 superconducting electrical circuits. The magnets are powered by power converters that have been designed for the LHC with a current between 60 and 13000A. Between October 2005 and September 2007 the so-called Short Circuit Tests were carried-out in 15 underground zones where the power converters of the superconducting circuits are placed. The tests aimed to qualify the normal conducting equipments of the circuits such as power converters and normal conducting high current cables. The correct operation of interlock and energy extraction systems was validated. The infrastructure systems including AC distribution, water and air cooling and the control systems was also commissioned. In this paper the results of the two year test campaign are summarized with particular attention to problems encountered and how they were solved.
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A Verweij,
V Baggiolini,
A Ballarino,
B Bellesia,
Frederick Bordry,
A Cantone,
M Casas Lino, A Castaneda Serra,
C Castillo Trello,
N Catalan-Lasheras, [......],
S Sanfilippo,
R Schmidt,
A Siemko,
M Solfaroli Camillocci,
Y Thurel,
H Thiessen,
W Venturini-Delsolaro,
A Vergara Fernandez,
R Wolf,
M Zerlauth
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ABSTRACT: During hardware commissioning of the Large Hadron Collider (LHC), 8 main dipole circuits are tested at 1.9 K and up to their nominal current. Each dipole circuit contains 154 magnets of 15 m length, and has a total stored energy of up to 1.3 GJ. All magnets are wound from Nb-Ti superconducting Rutherford cables, and contain heaters to quickly force the transition to the normal conducting state in case of a quench, and hence reduce the hot spot temperature. In this paper the performance of the first three of these circuits is presented, focussing on quench detection, heater performance, operation of the cold bypass diodes, and magnet-to-magnet quench propagation. The results as measured on the entire circuits will be compared to the test results obtained during the reception tests of the individual magnets.
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W Venturini-Delsolaro,
V Baggiolini,
A Ballarino,
B Bellesia,
Frederick Bordry,
A Cantone,
M Casas Lino, A Castaneda Serra,
C Castillo Trello,
N Catalan-Lasheras, [......],
K. Schirm,
R Schmidt,
A Siemko,
M Solfaroli Camillocci,
Y Thurel,
H Thiesen,
A Vergara Fernandez,
A Verweij,
R Wolf,
M Zerlauth
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ABSTRACT: The LHC is a complex machine requiring more than 7400 superconducting corrector magnets distributed along a circumference of 26.7 km. These magnets are powered in 1446 different electrical circuits at currents ranging from 60Â A up to 600 A. Among the corrector circuits the 600 A corrector magnets form the most diverse and differentiated group. All together, about 60000 high current connections had to be made. A fault in a circuit or one of the superconducting connections would have severe consequences for the accelerator operation. All magnets are wound from various types of Nb-Ti superconducting strands, and many contain parallel protection resistors to by-pass the current still flowing in the other magnets of the same circuit when they quench. In this paper the performance of these magnet circuits is presented, focussing on the quench behaviour of the magnets. Quench detection and the performance of the electrical interconnects will be dealt with. The results as measured on the entire circuits are compared to the test results obtained at the reception of the individual magnets.
