RUPAC2012 - List of Authors (Nikulin, E.S.)

Paper	Title	Page
TUPPB036	Study of Proton Injector Beam Transverse Phase Space Variations During Accelerating Voltage Pulse	397
	A. Belov, O.T. Frolov, E.S. Nikulin, V.P. Yakushev, V. Zubets RAS/INR, Moscow, Russia
	The proton injector of INR RAS linac provides a pulsed beam with the following parameters: current – up to 100-120 mA; duration – 200 mks; pulse repetition rate – 50 Hz; energy of ions – 400 keV. The results of numerical calculations and experimental study of beam phase space variations during injector high voltage pulse are presented. It is shown that these variations are caused by instabilities of both beam current and accelerating tube intermediate electrode potential. Instability of beam current has been minimized by using of noiseless mode of operation for the pulsed duoplasmatron and by stabilization of ion source discharge current. The high voltage pulse stability is now better than ±0.1%. High frequency oscillations at high voltage pulse plateau have been diminished by both decreasing of high voltage pulse generator artificial line characteristic impedance and filtration of high frequency component of the diode-capacitor stabilizer rack current. The beam transverse normalized emittance for 90% of beam current has been measured to be of 0.08 pi cm*mrad. Variations of the emittance during the high voltage pulse are in limits of ±4% value.

Paper

Title

Page

Study of Proton Injector Beam Transverse Phase Space Variations During Accelerating Voltage Pulse

397

A. Belov, O.T. Frolov, E.S. Nikulin, V.P. Yakushev, V. Zubets
RAS/INR, Moscow, Russia

The proton injector of INR RAS linac provides a pulsed beam with the following parameters: current – up to 100-120 mA; duration – 200 mks; pulse repetition rate – 50 Hz; energy of ions – 400 keV. The results of numerical calculations and experimental study of beam phase space variations during injector high voltage pulse are presented. It is shown that these variations are caused by instabilities of both beam current and accelerating tube intermediate electrode potential. Instability of beam current has been minimized by using of noiseless mode of operation for the pulsed duoplasmatron and by stabilization of ion source discharge current. The high voltage pulse stability is now better than ±0.1%. High frequency oscillations at high voltage pulse plateau have been diminished by both decreasing of high voltage pulse generator artificial line characteristic impedance and filtration of high frequency component of the diode-capacitor stabilizer rack current. The beam transverse normalized emittance for 90% of beam current has been measured to be of 0.08 pi cm*mrad. Variations of the emittance during the high voltage pulse are in limits of ±4% value.