| Paper |
Title |
Page |
| MOPO-23 |
New Spindle Cusp ZERO-B Field for ECR Ion and Plasma Sources
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123 |
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- M. H. Rashid, R. K. Bhandari, C. Mallik
DAE/VECC, Calcutta
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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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| TUCO-D03 |
Study of the Dependence of ECR Ion Current on Periodic Plasma Disturbance
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169 |
| |
- Dr. G. S. Taki, R. K. Bhandari, D. K. Chakraborty, P. R. Sarma
DAE/VECC, Calcutta
- A. G. Drentje
KVI, Groningen
- T. Nakagawa
RIKEN Nishina Center, Wako, Saitama
- P. K. Ray
Bengal Engineering and Science University, Howrah
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In a recent work we observed the existence of periodic current bursts from an ECR ion source when a biased disc is used for enhancing the extracted beam current. It was concluded that the current per burst in the source remains essentially constant. When the disc bias voltage is increased, the burst frequency increases, and so does the total current. Further it was seen that the current undergoes a jump at a fixed bias potential. The current jump has been found to be proportional to the charge state. The burst frequency also shows a correlated jump. However, in the case of protons a different trend is observed. As the bias potential is increased, at a particular potential value the current suddenly decreases. In this work we have studied the periodic bursts in the proton current in order to understand the difference in the behaviour of current jump in protons and heavy ions.
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