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A traditional ECR ion source (ECRIS) or plasma source use magnetic min-B field for plasma containment and energizing electrons based on the principle of the ECR process. A cusp field produces modified min-B or zero-B field. A new cusp field configurations (CFC) with symmetric field at the cusp positions, corresponding to a given RF frequency confirming the standard model, is simulated to contain large volume high density plasma for producing beam for low or high charged ion. The magnetic field increases along and across the magnetic lines of force starting from zero at the centre and maximum value at the periphery. The cusp field with convex lines of force towards the plasma is ideal for confining it as drift of the particles take place either in the azimuth or towards the low field region at the centre. Non-adiabatic behaviour of electrons at the centre is either tackled by gas-dynamic confinement at high density or exploited to generate more secondary electrons. Confinement feature of the field is assessed by electron simulation. A new technically viable cusp ECRIS has a bright prospect ahead as it is simple, stable, compact and cost-effective compared to the traditional ECRIS.
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