Experimental measurement of beam emittance of accelerator based 14-MeV neuron generator

Institute for plasma research has indigenously developed accelerator based 14-MeV neutron generator. It has a 2.45 GHz, 2 kW Electron cyclotron resonance (ECR) ion source for producing D+ ion. 500 μA ion beam is extracted with 10 kV extraction voltage from ECR ion source and it is further accelerated up to 300 keV. 14-MeV Neutron is produced by hitting accelerated deuterium beam to stationary water cooled tritium target. The performance of the neutron generator depends on ion beam parameters in which beam emittance is very important. There are some instruments are available in the market which directly measures it but these are expensive. This paper presents experimental techniques using common beamline components and related calculation to measure beam emittance. This arrangement uses variable focusing voltage of Einzel lens and one beam profile monitor. These results are very useful to characterize the neutron source and improvement of ion beam stability. (author)