M. Peyrot et al., Construction of the new prototype of main quadrupole cold masses for the arc short straight sections of LHC, IEEE APPL S, 10(1), 2000, pp. 170-173
Each cold mass of the short straight sections in the eight LHC arcs will co
ntain a 3.25 m long twin aperture quadrupole of a nominal gradient of 223 T
/m. This magnet will be aligned in a 5.3 m long inertia tube together with
auxiliary magnets on each end. On the quadrupole connection end either a pa
ir of 38 cm long octupole or trim quadrupole magnets will be mounted, on th
e other end there will be combined sextupole-dipole correctors with a yoke
length of 1.26 m. The powering of the main quadrupoles will be assured by t
wo pairs of copper stabilized superconducting bus-bars placed inside the co
ld mass next to the bus-bars for the main dipole magnets. Each of the two q
uadrupole apertures will be connected to its quench protection diode.he con
struction of three prototypes has been entrusted to the CEA/Saclay laborato
ry, in the frame of the special French contribution to the LRC project. The
first cold mass prototype has been completed and warm-measured for its mul
tipole content at CEA. The second cold mass is presently under completion.
The paper will review the experience with the development of the quadrupole
coils and cold mass construction and gives the results of the first warm m
agnetic measurements. An outlook for the series manufacture of the 400 are
quadrupole magnets and their cold masses for the LHC machine will complete
the report.