Tests for Pulsed High Current Heavy Ion Synchrotron Injection with an MP-Tandem Van de Graaff

Abstract

The new MARK VII high current negative heavy ion source designed by R. Middleton was operated in a pulsed mode to provide 100-200 μa negative ion currents in 230 μsec square pulses, 10/sec. These pulses, 50-100 times more intense than normal DC beams, were then accelerated by the MP7 Tandem Van de Graaff accelerator while operating at 14 MV. After charge state analysis, the emittance of the pulsed beam was also measured. The very stable accelerator behavior indicated that even higher currents are possible. Values for ¹⁶O are: 115 μa ¹⁶O. injected, 100 MeV ¹⁶O⁶⁺, 260 μa (43.3 pμa) 1.8 mm.mr and for ³²s are: 170 μa ³²S- injected, 140 MeV ³²S⁹⁺, 240 μa (26.7 pμa) 0.51 mm.mr. The high intensity and low emittance of these ion beams make them ideal for injection into a synchrotron like the AGS 30 GeV proton accelerator at BNL.