Author: Abiven, Y.-M.
Paper Title Page
TUPC068 SOLEIL Beam Orbit Stability Improvements 1156
 
  • N. Hubert, Y.-M. Abiven, F. Blache, F. Briquez, L. Cassinari, J.-C. Denard, J.-F. Lamarre, P. Lebasque, N. Leclercq, A. Lestrade, L.S. Nadolski
    SOLEIL, Gif-sur-Yvette, France
  
  The elec­tron beam orbit sta­bil­i­ty has been sig­nif­i­cant­ly im­proved at syn­chrotron SOLEIL. Low fre­quen­cy noise sources have been lo­cal­ized and iden­ti­fied: the fans in­stalled on the stor­age ring to cool down the ce­ram­ic cham­bers of the kick­ers, shak­er and FCT, were slight­ly wob­bling the elec­tron beam orbit at 46, 50, 54 and 108 Hz. The lo­cal­iza­tion method and the so­lu­tions that will allow re­duc­ing the noise from 0.8 μm RMS down to 0.3 μm are pre­sent­ed. Be­sides, a new 160 m long beam­line, NANOSCOPI­UM, is being in­stalled on a cant­ed straight sec­tion. Its pho­ton beam po­si­tion sta­bil­i­ty re­quire­ments are very tight call­ing for the fol­low­ing im­prove­ments: ad­di­tion of 2 more BPMs and fast cor­rec­tors in the orbit feed­back loops, new INVAR stands for BPM and XBPM in­te­grat­ing Hy­dro­stat­ic Level Sys­tem sen­sors. The paper is also dis­cussing other pro­jects that did or will con­tribute to im­prov­ing the beam orbit sta­bil­i­ty: in­stal­la­tion of 145 tem­per­a­ture sen­sors on the stor­age ring, a new ana­log feed­for­ward cor­rec­tion sys­tem for in­ser­tion de­vices, and the use of the bend­ing mag­net X-BPM mea­sure­ments in the slow and fast orbit feed­back loops.