Search

At the GSI Synchrotron (SIS18) and the high-energy beam transfer lines (HEBT) several particle counting detectors of different types are installed. These are connected to one dedicated 128-Channel VME based data acquisition system called “A Beam Loss Measurement and Scaling System (ABLASS),” which was recently added to the GSI control system. An overview of all its implemented features is given. Experiences gained during daily operation as well as the more sophisticated applications such as high-resolution spill structure analysis with up to 100-kHz sample rate and slow extraction optimization are presented. In addition the SIS18 is going to be the injector for the planned superconducting double ring facility SIS100/300, which is part of the GSI future project, which was recently named FAIR, the international Facility for Antiproton and Ion Research. Therefore the observation of beam losses at the SIS18 produced by the required high currents is essential to prevent activation and vacuum instabilities. The methods for the beam loss measurement are described. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Particle counters perform the control of beam loss and slowly extracted currents at the heavy ion synchrotron (SIS) at GSI. For these devices a new data acquisition system has been developed with the main intention to combine the operating purposes beam loss measurement, spill analysis, spill structure measurement and matrix switching functionality in one single assembly. To provide a reasonable digital selection of counters at significant locations a modular VME setup based on the GSI data acquisition software MBS (Multi Branch System) was chosen. An overview of the design regarding the digital electronics and the infrastructure is given. Of main interest in addition to the high performance of the used hardware is the development of a user-friendly software interface for hardware controls, data evaluation and presentation to the operator. [ABSTRACT FROM AUTHOR]

The new 1.4 MeV/u high current injector for the Unilac successfully commissioned in 1999 is now accelerating heavy ions close to the calculated intensities. For example an [sup 40]Ar[sup 1+] beam with 8 emA allows to fill the GSI synchrotron to its inherent intensity limit. For emittance measurements of such intense beams a single shot pepperpot system has been developed. An overview of the hard- and software including mathematical algorithms is given. Results of emittance measurements at different intensities and energies are presented. The influence of stripping and related space charge effects on the emittance could be investigated. [ABSTRACT FROM AUTHOR]