Testing and calibration of low Energy ion source in high Vacuum space simulation Chamber

Arpith, . (2014) Testing and calibration of low Energy ion source in high Vacuum space simulation Chamber. Masters thesis, Manipal Institute of Technology, Manipal.

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Space plasma physics is one of the emerging areas due to the advancement in space exploration capabilities using space and planetary missions. To study the space plasma, insitu measurement is necessary. To achieve this, plasma analysers are being developed and flown to space for detecting the charged particles. Before using the plasma analyser instrument in space, it has to be tested and calibrated in the laboratory condition. In order to do the same, the laboratory environment has to be made similar to that of space. In the laboratories ion and electron sources are being used to generate plasma environment inside the high/ultra high vacuum chambers. In the present work, an attempt is made to test and calibrate a low energy ion source in the High Vacuum Space Simulation Facility (HVSSF) of SPL. Prior to the testing of Ion source it is mandatory to understand the principle and operation of high vacuum system including all its subsystems. The working and characteristics of different vacuum pumps and gauges in general and the detector assembly such as MCP/CEM etc. wereunderstood clearly prior to the operation of ion source. The methodology for testing ion source was developed. Using different available gases the ion beam are generated using the source and its response was observed at the detector assembly. Data acquisition and analysis set up was made to acquire the data and analyse them to know the characteristics of the source. Major source characteristics such as filament sensitivity, response of source with change in emission potential, beam energy and the variations in current output were determined and optimised by analysing the data. The response of source is observed for different gases and it was optimized for producing maximum output current. The ion source was tested at different chamber pressures and the results are then analysed and presented in this report. In addition to the testing and calibration of low energy ion source, to get familiar with the plasma analysers and to get a first-hand experience on ion optics simulation, a novel plasma analyser was proposed and then simulated using an Ion optics simulation software- SIMION 8.0. The proposed analyser model is optimized for detecting ions and electrons simultaneously, thus avoiding multiple sensors for the analysis. Energy and mass analysers are the integral part of this proposed model. Parameters like voltage, energy, angular and mass resolutions were determined using simulations. The field of view, time of flight were also determined using ray tracing methods. The complete set of simulated results are analysed using programs generated using MATLAB and presented in this report. The characterisation of the low energy ion source is mandatory before doing the testing and calibration of space borne plasma analysers. An attempt is made here to characterise the ions source for its future applications. Also the simulation results will help to realise the instrument in the near future and use the same in the laboratories or in space for the simultaneous detection of both electrons and ions

Item Type: Thesis (Masters)
Subjects: Engineering > MIT Manipal > Instrumentation and Control
Depositing User: MIT Library
Date Deposited: 13 Nov 2014 10:36
Last Modified: 13 Nov 2014 10:36
URI: http://eprints.manipal.edu/id/eprint/141056

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