Conference


The New GSI Injector Linac for High Current Heavy Ion Beams

U.Ratzinger

GSI, Darmstadt, Germany

Abstract

The original UNILAC injector uses Penning type ion sources and charge states up to 10+ for Uranium beams. The beam intensities for very heavy ion species out of that injector are too low by almost a factor 300 to fill the Heavy Ion Synchrotron SIS up to its space charge limit. At present only ion sources like CHORDIS or MEVVA which generate low charge states - up to 4+ above mass 200 - can provide the requested beam intensities during a pulse duration of 100 microsec.

The IH-DTL with its high acceleration efficiency offers the possibility to install a new 91 MV linac while keeping the positions of the pre-injectors and of the gas stripper untouched. The Wideroe rf frequency of 27 MHz will be replaced by 36 MHz, being one third of the Alvarez frequency.

The paper will focus on the rf structures and especially on the beam dynamics along the IH-DTL.


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sln 14 March 1996