Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
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Material <strong>Physics</strong> 1915.2.3.6 Broad beam ion source for tribological studiesA low energy broad beam ion source is an attractive tool for surface modification studies and hassome advantages (like, independent adjustments <strong>of</strong> the beam energy and the intensity) over theconventional plasma diode configuration. Applications <strong>of</strong> such ion sources are ion milling/etching ina controlled way for depth pr<strong>of</strong>iling, oxidation and nitridation, multilayer surface deposition etc. Aplan was undertaken to develop an ion source for the above purpose. To satisfy the requirements <strong>of</strong>high current density (1 mA/cm 2 or more), large beam diameter (3 cm) and high uniformity (∼5%),a Kaufman type ion source (giving Ar + ions) has been designed, with low extraction potential andmulti-aperture ion optics. The construction <strong>of</strong> the complete ion source has been finished. In preliminaryoperation, a low energy Ar + beam (∼ 400 µA at the target) could be extracted. Prolongedoperation, however, could not be done due to tungsten deposition on the insulating spacers andconsequent high voltage breakdown. The design has therefore been somewhat modified to avoidsuch problem and the modifications are now under construction.SK <strong>Saha</strong>, D GhosePP, SP5.2.3.7 S<strong>of</strong>tware developedA number <strong>of</strong> programmes have been written in MATLAB for the following : (a) Analysis <strong>of</strong> data <strong>of</strong>the non-diffusive plasma transport experiment (conditional averaging, wavelet correlation, higherorder statistical moments, heat flux etc). (b) Spectral analysis and correlation <strong>of</strong> data from hardx-ray detectors, s<strong>of</strong>t x-ray camera and Mirnov loops. (c) Calculation <strong>of</strong> the axial and transversecomponents <strong>of</strong> magnetic field at points on the axis <strong>of</strong> a multicoil solenoid system as well as at<strong>of</strong>f-axis points. Force between coils have also been evaluated. This programme has been used forthe design <strong>of</strong> the magnet coil system <strong>of</strong> the plasma propulsion project.SK <strong>Saha</strong>PP5.2.3.8 Linear Magnetized Plasma Device (Q machine) in SINPThe fabrication <strong>of</strong> major components <strong>of</strong> the SINP Q-machine, namely, the magnet coil system, itssupport structure, the power supply, the cooling water system, the vacuum vessel and the vacuumpumping system is near completion. The vacuum pumping system consisting <strong>of</strong> a 250 l/s turbomolecularpump backed by a rotary pump gave a base vacuum <strong>of</strong> about 1.5 x 10-5 torr in the 0.3m dia., 2.3 m long SS vacuum chamber. Magnetic coil system will be powered and tested next.Preliminary plasma will be
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