Abstract
A sheet plasma of thickness several millimetres was produced by a combination of a pair of strong dipole magnets with opposing fields and a pair of Helmholtz coils producing a magnetic mirror field. A ferrite magnet and a coreless magnetic coil encased within the limiters add to the mirror field, enhancing quiescence in the plasma. The negative hydrogen ions produced in the peripheral region of the sheet plasma were extracted with a deflection mass spectrometer. Maximum negative ion current of about 0.9 A for an initial gas filling pressure of 3 mTorr was observed when the plasma electrode was negatively biased near the value of the plasma potential and when the mass spectrometer coil current generated a B field intensity equal to 691 G. The ratio of the negative ion density and the electron density near the extraction electrode was relatively high at 0.276. The measured electron temperature showed the existence of high-energy electrons in the sheet plasma. The extracted negative hydrogen current density of is higher than what has been obtained from similar sources. The bulk electron temperature and density at the centre of the sheet plasma were measured to be 11.06 eV and , respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
