Author: Muller, D.
Paper Title Page
THPC140 Design, Tuning and Results of the Pulsed Magnetic Systems for the Beam Injection in the SOLEIL Storage Ring Operated in ‘Transparent’ Top Up Mode 3215
 
  • P. Lebasque, R. Ben El Fekih, M. Bol, J. Da Silva Castro, A. Hardy, C. Herbeaux, J.-P. Lavieville, A. Loulergue, J.L. Marlats, D. Muller, G. Renaud, J.P. Ricaud
    SOLEIL, Gif-sur-Yvette, France
 
  From the beginning, the SOLEIL Storage Ring was designed to operate in Top Up injection mode. So all equipments involved have been specified to generate as small as possible beam perturbations of the stored beam during the electron beam injection. This concerns many aspects of the design and realization of the injection pulsed magnets (kickers and septa), their vacuum chambers, pulsed power supplies and timing electronics. Despite quite satisfactory results of pulsed magnetic measurements in labs, a still too large perturbation was observed on the e- beam orbit during the Storage Ring commissioning. Therefore a strong work of systematic measurements, analysis of each phenomena, tuning or modification of each device was led until reaching rather good and acceptable performances. This paper will present the results obtained. At this stage, the Storage Ring beam orbit is sufficiently stable in Top Up injection mode so that it is almost transparent to the 24 beam lines, even for the most sensitive ones. After a summary of the main significant topics, we present the developments foreseen to further improve the performances and make a new step towards a “perfect” Top Up injection.  
 
THPO001 Design Power Supply Considerations to Compensate Booster Power Supply Effects on the SOLEIL Storage Ring 3335
 
  • J.-P. Lavieville, R. Ben El Fekih, S. Bobault, D. Muller, L.S. Nadolski
    SOLEIL, Gif-sur-Yvette, France
 
  Top-up injection mode has been routinely in operation since March 2009 for various bunch filling patterns at Synchrotron SOLEIL. The electron beam stored current is maintained within 1%. At each injection the 3 Hz booster power supplies are ramped up and down over 10 seconds every 3 minutes in average. During this time DC and AC perturbations are observed on the storage ring horizontal closed orbit. Typically, the beamline source points can be shifted up to 10-20 μm and the amplitude of the 3Hz frequency is multiplied by a factor 9. The origin of these perturbations lies in the imperfect compensation of the magnet currents circulating along the booster ring located inside the storage ring. To compensate these disturbances, a wire loop was installed in the booster cable tray fed by an in-house developed power supply. Its output current is driven by direct measurement of the main currents of the booster dipole, quadrupole, sextupole power supplies with a proper amplitude and phase shift. This paper presents the determination of the compensation needs according to beam measurements, the original design and the performance reached when this power supply is acting.