BUNCH-SHAPE MONITOR FOR A PICOSECOND SINGLE-BUNCH BEAM OF A 35-MEV ELECTRON LINEAR-ACCELERATOR

A non-interactive-type bunch-shape and beam intensity monitor for a 35 MeV electron linear accelerator (linac) has been developed. The monit or consists of an electric SMA-type connector and an Al pipe of 50 mm inner diameter. Test measurements of the present monitor have been mad e under the conditions of the accelerated charges of lower than 27 nC/ pulse and the pulse width ranging from 6 to 30 ps (Full Width at Half Maximum). The results show that the present monitor is applicable to b unch-shape measurement of the picosecond single-bunch beam. The monito r output is also found to be proportional to the beam intensity of mor e than 0.05 nC/pulse.