Abstract-The Large Hadron Collider (LHC) needs more than 6000 superconducting corrector magnets. These must be sufficiently powerful, have enough margin, be compact and of low cost. The development of the 11 types of magnets was spread over several years and included the magnetic and mechanical design as well as prototype building and testing. It gradually led to the systematic application of a number of interesting construction principles that allow to realize the above mentioned goals. The paper describes the techniques developed and presently used in practically all the LHC corrector magnets ranging from dipoles to dodecapoles.

Applied Superconductivity Conference, ASC this paper. simple design. The design, the test set up and the results are described in prototype has been built which combines a low heat loss with an extremely was made to investigate different types of high Tc leads. Since then, a could be made with high Tc material. In the recent past, a theoretical study have been designed for a very low current of about 25 amperes and the leads temperature. To minimize the heat loss through these leads, the magnets individually powered and each needs a pair of current leads to the ambient magnets to correct the orbit of the particle beams. These magnets will be The Large Hadron Collider (LHC) will need some 800 superconducting Abstract A. Ballarino, and A. Ijspeert Collider Orbit CorrectorsDesign and Test of the Prototype High Tc Current Leads for the Large Hadron ·&,U¢€ § BOB

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The paper discusses the inverse field calculation problem (design variables) is identical to the method used in [3] treatment of upper and lower bounds for the perturbations erances for the construction.sidered as is often the case in design optimization. The they come from, thus allowing to specify appropriate tol function as there are no nonlinear constraints to be con reduce these random errors it is necessary to know where finding the minimum value of an unconstrained objective arrangements in the manufacturing process. In order to The optimization procedure consists of an algorithm for ponents which are due to perturbations of the coil block Their measured field distribution exhibits multipole com from line currents at strand location.ment programs with industry and national laboratories and calculates the magnetic field, using Biot-Savart law,

The corrector magnet for the Large Hadron Collider (LHC) contains a 1.5 tesla dipole for orbit correction and a 8000 T/m2 sextupole for chromaticity correction. The dipole has for compactness been mounted around the sextupole coil. A full scale prototype of 1.3 m length has been fabricated and tested. The coils were first tested at 4.2 K. It appeared that the training of the impregnated coils could be strongly reduced by increasing the radial pre-compression. The coils were subsequently cooled to the operational temperature between 1.8 and 2 K and the field quality was measured with a harmonic rotating coil. The paper presents the results of these tests and the experience obtained with such a type of combined magnet.