Fitzek, J.

Hellmich, R.

Liebermann, H.

Müller, R.

Ondreka, D.

Reimann, S.

Schlei, B. R.

Struckmeier, J.

GSI Repository

Project Status of the New Setting Generation System for GSI and FAIRD. Ondreka1, J. Fitzek1, R. Hellmich1, H. Liebermann1, R. Mu¨ller1, S. Reimann1, B. R. Schlei1, andJ. Struckmeier11GSI, Darmstadt, GermanyIntroductionSince 2008, a project group at GSI is developing a set-ting generation system for the accelerators of GSI andFAIR using the CERN LSA (LHC Software Architecture)framework [1]. This report summarizes the developmentprogress during the year 2012.LSA FrameworkThere were no major changes to the LSA framework.However, a strategy was devised within the LSA collabora-tion for the design and implementation of the pattern con-cept required for modeling the parallel operation modes ofthe FAIR facility. It was agreed that the implementation ofthis eminently important extension will take place duringthe long shutdown of the LHC this year.Also, a first step was made towards a better separation ofthe FAIR specific resources and the common LSA frame-work. While the latter will remain hosted at CERN, allFAIR specific resources are now located in a repository ofthe GSI controls group.Machine ModelingThe generic synchrotron model was adapted to make useof the recently implemented LSA support for flexible cyclelengths. The models for SIS18 and SIS100 were revisedand improved.The SIS18 machine model was used to perform machineexperiments with and without beam for the planned boosteroperation mode. One experiment was devoted to the dualharmonic operation. Dual harmonic buckets could be suc-cessfully established at injection level. Acceleration was,however, not possible due to an insufficient phase calibra-tion of the acceleration cavities.A second experiment was performed to test a newparametrization of the optics change from triplet to dou-blet during the ramp. At the ramping speed of 10T/s forthe booster operation, the voltage of the triplet power sup-ply would exceed its limit by fifty per cent. The boosterparametrization escapes this limit by reducing the tripletstrength faster (see figure 1). However, this scheme implieslarger beam radii during the ramp, potentially leading tobeam loss. Therefore, the number of particles as a functionof time was measured with a U 28+ beam of high intensityat 3T/s, for both the standard and the booster parametriza-tion. No excess beam loss was observed, proving the feasi-bility of the booster parametrization (see figure 2).Figure 1: Triplet strength for the standard (dotted line) andbooster (solid line) parametrization.Figure 2: Normalized number of particles for the standard(dotted line) and booster (solid line) parametrization.An experiment without beam was concerned with the ca-pabilities of the power supplies at 10T/s. As a result, thesupplies for the triplet and for the bump at the magneticseptum will be upgraded to sustain the booster operation.Besides the work for SIS18, a minimal model of the ESRring (without cooler yet) was implemented and the first set-tings have been generated.Apart from the machine models, applications were fur-ther developed. The first one, ParamModi, was used ex-tensively during the machine experiments for controllingSIS18. The second one, a Java version of the ion opticsprogram MIRKO, was successfully converted into an ap-plication interacting with the LSA system.In 2013, the main focus will be on the extension of LSAto support the pattern concept for parallel operation.References[1] G. Kruk et. al, “LHC Software Architecture LSA – EvolutionToward LHC Beam Commissioning”, ICALEPCS’07.PHN-FAIR-28 GSI SCIENTIFIC REPORT 2012254 FAIR@GSI

Project Status of the New Setting Generation System for GSI and FAIR

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Project Status of the New Setting Generation System for GSI and FAIR

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