New layout of the rings for the 0.5 MW/10 Hz/50 Hz AUSTRONspallation source

摘要

In 1993-94 a feasibility study for AUSTRON, a neutron spallationsource, was made. At that time the machine was a synchrotron cycling at50 Hz and delivering an average beam power of 410 kW at 1.6 GeV. In1998, the Austrian Government decided to contribute one third of thetotal cost of the facility and invited international partners toparticipate. In 1999, a more ambitious upgrading of the original conceptwas proposed aiming at 0.5 MW, pulsed at either 50 Hz or 10 Hz. Theslower repetition rate is achieved by the addition of a storage ringholding four consecutive (single bunch) pulses from the 50 Hzsynchrotron until a fifth pulse is accelerated and transferred to thetarget with the four stored ones, hereby increasing the intensity perpulse by a factor 5. The resulting 5-bunch pulse duration is 1 μs.The choice of the geometry is discussed, and the lattice design for thestorage ring and the transfer line from the synchrotron presented. Alsoaddressed are the critical longitudinal aspects resulting from themandatory use of harmonic number one