1. Major in-house magnet development and testing facilities in AMTD:

I. General machinery available in AMTD for development of magnets as shown in fig.1.

Fig. 1: General machinery for development of accelerator.

II. Facilities for development of magnet coils:

(a) Winding machine for dipole magnet coils:

The machine has been utilized for winding of single/double pancake coils for dipole magnets. This machine has been equipped with low speed geared motor for rotation of winding fixtures, auto taping head for wrapping of insulation on the conductor, conductor straightening & tensioning unit etc. The details of the dipole winding machine is shown in fig.2 and fig.3 shows the encapsulated wound dipole coils with epoxy resin under vacuum.

Fig.2: Dipole magnet coil winding machine.

Fig.3: Epoxy-resin encapsulated Dipole magnet coils

Fig. 4: Semi-automatic winding machine for coils of Quadrupole & Sextupole magnets. (Main motor H.P: 2, Winding speed: 1 – 5 rpm, auto taping head & pitch adjustment)

Fig.5: Epoxy-resin encapsulation plant (L), series produced wound and encapsulated coils of quadrupole & sextupole magnets (R).

Fig. 6: Electrical testing gadgets for magnet coils, (i) Resistance & Inductance measurements; (ii) Inter-turn coil insulation test.

Fig. 7: Hydraulic-Pneumatic test set-up for water-cooled magnet coils.

III. LCW Plant:

A 700 kW, 650 LPM and 10 bar pressure low conductivity water (LCW) processing plant has been established in AMTD for cooling of high current density magnet coils during their testing. Fig. 8 shows the outside view of LCW plant and fig. 9 shows the details of inside process machinery for production of LCW.

Fig. 8: Outside view of LCW plant installed & commissioned in AMTD.

Fig.9: Process machinery inside plant for production of LCW.

Material handling facilities in AMTD:

Several material handling equipment (MHE) have been installed for handling of various magnets during their development. These include 1-2 MT jib cranes, mono rail cranes, 5-10 MT EOT cranes and a 50 MT EOT crane. The 50 MT (11.5 m span) is the highest capacity of EOT crane installed in RRCAT till to date. Fig. 10 shows the installed 50 MT EOT crane at MT Lab, AMTD for handling of large size electro-magnets.

Fig. 10: 50 MT EOT Crane installation at MT Lab., AMTD

Magnetic field measurement facilities in AMTD:

(1) Hall probe based 3-D Magnaflux field mapping machine:

This has been developed mainly for field measurement of dipole magnets. The stroke lengths of the system in three orthogonal axes (X, Y & Z) are 3m x 0.8m x 0.6m respectively. The positional accuracy in all three axes is ± 0.01 mm / 1000 mm. The complete system is PC controlled with provision to operate it in manual mode through a joystick pendant and in auto-mode as programmed. The position and corresponding field values are acquired simultaneously for magnetic field analysis. Fig. 11 shows the details of 3-D Magnaflux field mapping machine.

Fig. 11: 3-D Magnaflux field mapping machine for dipole magnets.

Fig. 12: Rotating coil measurement system (Danfysik make) with quadrupole magnet.

Fig. 13: Indigenous rotating coil measurement system with quadrupole magnet.

Fig. 14: Stretched wire measurement setup for measurement of the magnetic axis of a solenoid (L); Enlarged view of stretched wire passing through the aperture of the solenoid (R).

Fig. 15: 5T pulse magnetizer system.

Fig. 16: M-H loop tracer system.

Fig. 17: DC Permeameter system.

Fig. 18: Characterization of feebly magnetic materials.

Fig. 19: FMR Measurement setup.

Fig. 20: Complex Permeability Measurement set up.

Fig. 21: Spin wave line width measurement system.

Fig. 22: Ferromagnetic resonance measurement system.

The majority of insertion devices used in synchrotron light source are undulators. Undulators are build using permanent magnet blocks like Samarium Cobalt and Neodymium Iron Boron. The magnetic field quality of an undulator is related to the variation of magnetic properties of the individual permanent magnet block. Therefore, the magnetic properties of each block should be measured precisely and accordingly sorted before being used in the assembly of undulator to minimize the field integrals and the phase error of the device. A Helmholtz Coil measurement set up has been developed to characterize the permanent magnet blocks. Fig.23 shows the Helmholtz coil setup. The measuring system consists of two identical circular coils of radius 400 mm placed coaxially and separated by a distance equal to the radius of the coils. The number of turns for each coil is 3000. A vertical rotary mechanical system with aluminum shaft with a magnet holder, which holds the magnet in the centre region of the coil pair.

Fig. 24: Helmholtz Coil setup for characterization of permanent magnet block.

Fig. 24: Snapshot of GUI for Helmholtz Coil setup.

Recently, the existing multipole measurement system has been successfully equipped with a motorised multi-axes precise magnet positioning system for alignment of the multipole magnets during their magnetic field measurements. This positioning system has a load carrying capacity of 10 kN and range of motions include linear motion of ± 25 mm and rotational motion ± 3 degree. The positional accuracy of the positioning system is ± 0.02 mm in linear and ± 0.1 mrad in rotational on X, Y and Z - axes. This indigenously developed complete measurement system is shown in fig. 23. It consists of a rotating coil, a dc motor to rotate the sensor coils assembly, an incremental encoder and a digital integrator (PDI-5025) for flux measurement. The measured higher order multipoles in a multipole magnet eg. a quadrupole magnet or a sextupole magnet are found in good agreement with those obtained from the measurement system of M/s. Danfysik.

Fig.25: Indigenous rotating coil measurement system with magnet positioning system measuring sextupole magnet