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Indus-1 is a 450 MeV storage ring designed to provide radiation in the range 30 - 2000 Å. It is a small ring having a circumference of 18.96 m. The critical wavelength of the radiation emitted from its four 1.5 T bending magnets is 61 Å. The machine was put regular operation on 26th of September 2002.
The magnetic lattice of the ring consists of 4 super periods, each having one dipole magnet with a field index of 0.5 and two doublets of quadrupoles. The field index of 0.5 in the dipole magnets helps in achieving a larger stability range because it provides weak focussing in radial and vertical planes. Each super-period has a 1.3 m long straight section.
To correct the natural chromaticity of the ring, which arises due to different focusing of different energy particles, is corrected using a pair of sextupoles in each super period. The sextupole field gives rise to nonlinear kicks to the beam.
Major parameters of Indus-1 Dipole magnet
Aperture gap |
50 mm |
| Good field region |
x=± 35mm, z = ± 12.5 mm |
Field |
1.5 T |
| Bending angle |
90° |
| Bending radius |
1.0 m |
| Field index |
0.5 (± 0.01 random) |
Major parameters of Indus-1 Quadrupole magnet
Aperture radius |
40 mm |
Good field region |
x=± 35mm, z = ± 12.5 mm |
Quadrupole integrated strength |
Qf -6.0 m-2
Qd 9.0 m-2 |
Major parameters of Indus-1 Sextupole magnet
Aperture radius |
90 mm |
Good field region |
x=± 35mm, z = ± 12.5 mm |
Sextupole integrated strength |
Sf -4.0 m-2
Sd 4.0 m-2 |
All these magnets were designed using 2-D POISSON/PANDIRA code. Magnetic measurements of Dipole magnets were carried out using Hall probe mounted on a 2-axis computer controlled machine. The quadrupole and sextupole magnets were characterized by using a rotating coil system made by DANFYSIK model 690.
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