THE INVESTIGATION OF THE FEASIBILITY OF AN ELECTROSTATIC ACCELERATOR FOR ACCELERATING MICRONDIAMETER PARTICLES. PART I. VAN DE GRAAFF GENERATOR. PART II. CHARGING OF MICRO PARTICLES
UTAH UNIV SALT LAKE CITY
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A Van de Graaff generator which charges to 600,000 v and delivers 70 microamps when negatively charged and 10 microamps at 475,000 v when positively charged was built. Charge is generated by ionization in the vicinity of the lower pully and transferred from the belt to the oblate by means of ionized air which is due to the potential between belt and oblate. Loss of charge from the belt other than that to the oblate and the maximum surface charge density on the belt were calculated. An equivalent circuit which is a function of belt speed only was obtained and given good agreement with experimental voltage measurements at low belt speeds. An electrostatic particle-accelerator using the Van de Graaff generator was built to accelerate carbonyl-iron spheriods having an average diameter of 3 microns for hypervelocity impact studies. The particles are first charged and then accelerated by the generator. A method for measuring the charge and velocity of the particles is discussed.