Colloquium #154
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         Institute for Plasma Research, Bhat, Gandhinagar
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                     Dr. Mainak Bandyopadhyay
                            NBI Group,
                         IPR, Gandhinagar.

                                on

                   Negative hydrogen ion source
              (Ion source for the future NBI systems)

 The  colloquium will give a general overview of a negative hydro-
 gen ion source, developed for high energy ( >  200keV  )  neutral
 beam  injection  (NBI) systems, which are used in the bigger size
 fusion devices like JT-60, LHD etc. In the case of ITER, negative
 hydrogen  ion  source  is the only candidate for its neutral beam
 system. The presentation  will  highlight  the  basic  mechanisms
 (plasma chemistry) for H- ion production and destruction. Differ-
 ent technical and physical issues involved in the  source,  which
 are  still unresolved, will be discussed. Negative ion diagnostic
 is not straightforward because the negative ion and the  electron
 have  the  same  charge  and  it  does not have any bound excited
 state. Few diagnostics will be briefly introduced in the talk.

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                       Date:       December 28, 2004 (Tuesday)
                       Venue:      Seminar Hall
                       Programme:  3:40 PM  : Refreshments
                                   4:00 PM  : Talk
                                   5:00 PM  : Discussion
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