EFFECT OF MAGNETIC FIELD COUPLING ON INDUS-2 QUADRUPOLE MAGNETS

The distances between the magnets in the Indus-2, are small and as a result, the magnetic field of one magnet may affect the fields of the adjacent magnets. Therefore, it is important to find out the effect of mutual coupling between magnets in the actual condition in the ring and the ways to overcome this problem. In this paper, we will discuss how the field quality of quadrupole magnets (QP) in the ring is affected when accompanied by various corrector dipole magnets (CDP)(vertical and horizontal) and sextupole magnets (SP). Variations of integrated quadrupole field strength in presence of CDPs are measured at various field excitations and also by varying the distance between the magnets using a rotating coil. Experimental results are compared with the results obtained from 3D simulations. Possibilities of studying the interference effect by scanning the field by a Hall probe, is explored. Dependence of field interference on the distance between magnets, pole gap and the steel length are studied. Effects of the adjacent magnets on the higher order multipole of QP are also examined.