21-23 March 2016
Europe/Paris timezone
EMILIE WORKSHOP

Recycling of sediments from ECR chamber wall by the electron escape paths changing in the magnetic trap

22 Mar 2016, 10:00
30m

Speaker

Mr Lukasz Standylo (HIL, Warsaw University)

Description

A well-known method of improving the operation of ECRIS with solid state materials is lining the plasma chamber to recover neutralized plasma material deposited on the walls. This method is used mainly in production of metallic ions by oven technique. The efficiency of this process can be improved by better understanding mechanisms of ECR plasma interactions with chamber wall materials. Different types of screens (liners) for the plasma chamber with various materials (Ta, Ti, Mo, W) and thickness have been tested. To increase magnitude of wall recycling effect the azimuthal position of hexapole magnetic trap has been rotated during ECR plasma burning. A rotary hexapole magnet system has been used to change the position of electron escape lines on the surface of the liner. Additionally different types of material deposited and recovered from the walls of the liner may affect the stability of the plasma. As an example, aluminum liner wall coating is able to reduce plasma potential which improves plasma stability and therefore can reduce ion recombination and sedimentation on the chamber wall. Electron density change in the plasma can be better estimated with controlled disordering of plasma burning process by modifying the arrangement of magnetic trap.

Primary author

Mr Lukasz Standylo (HIL, Warsaw University)

Co-authors

Dr Jaroslaw Choinski (HIL, Warsaw University) Mr Przemyslaw Gmaj (HIL, Warsaw University) Mrs Saeed Mohamed Nassar Olga (HIL, Warsaw University) Dr Sudlitz Krzysztof (HIL, Warsaw University)

Presentation Materials