Beam based diagnostic and four dimensional transverse emittance measurement using solenoid scan for 100 keV thermionic electron gun at VECC, Kolkata

Abstract

Solenoid in the low energy beam transport line used for focusing 100 keV electron beam has also been utilized as a beam diagnostic tool. 4D transverse emittance has been determined by analyzing the second moment beam distribution on a view screen placed downstream using solenoid scan technique which require no a-priori assumptions of the input beam. The measured transverse emittance is compared with the emittance tomographically reconstructed from the measured beam profiles corresponding to the same set of solenoidal fields in the solenoid scan.