Up gradation of Microcontroller Based 3 Axis Control and Drive System for Magnetic Field Mapping of SCECR

For the confinement of the ECR plasma within the plasma chamber, mirror and multicusp magnetic fields are being used. The mirror field Bz (z,r) is being generated by injection and extraction coil. Whereas the multicusp field Br (r, θ) is developed by sextupole permanent magnet. In the recent past, the magnetic field profile measurement and study was conducted for the newly developed 14.5 GHz ECRIS 3 of VECC. The axial field has been measured for different excitation of the solenoid coils whereas the radial field is measured at no excitation of the coil. During that process, the magnetic field profile along all the three axis was obtained separately and there was no provision for driving the magnetic probe along all the r, θ, z axis simultaneously. An effort has been given for the 3 axis magnetic field mapping of the proposed 18 GHz Superconducting ECR of VECC and a microcontroller based drive system has been developed. The magnetic probe attached at the tip of the measuring arm can be driven by changing z, r and θ command simultaneously. The control of the drive system as well as the data acquisition is done by the PC interface using Lab VIEW GUI.