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Filho, H.G.

Paper Title Page
WEPEA004 Large Vacuum Intervention to Install New BPMs and Radiation Absorbers in the LNLS Electron Storage Ring 2475
 
  • R.M. Seraphim, O.R. Bagnato, F.H. Cardoso, R.H.A. Farias, R.O. Ferraz, H.G. Filho, F. R. Francisco, G.R. Gomes, S.R. Marques, R.T. Neuenschwander, F. Rodrigues, A.L. Rosa, M.B. Silva, M.M. Xavier
    LNLS, Campinas
  • P.F. Tavares
    Karlsruhe Institute of Technology (KIT), Karlsruhe
  
 

In the be­gin­ning of 2008 an up­grade of the beam po­si­tion mon­i­tors (BPMs) of the Brazil­ian Syn­chrotron Light Source (LNLS) elec­tron stor­age ring was de­cid­ed and sched­uled as part of the con­tin­u­ous ef­fort to im­prove the elec­tron beam orbit sta­bil­i­ty. The ob­jec­tive was to re­place most of the 24 BPMs in­stalled in the stor­age ring and in­stall new ra­di­a­tion ab­sorbers in­side the vac­u­um cham­ber. The orig­i­nal stripline BPMs were sen­si­tive to tem­per­a­ture changes in the vac­u­um cham­ber. Heat, which in­duced me­chan­i­cal stress in the striplines, could lead to fluc­tu­a­tions in the po­si­tion read­ings there­by dis­turb­ing the orbit sta­bil­i­ty. The prob­lem af­fect­ed dif­fer­ent­ly the BPMs. Al­though not a great issue dur­ing a typ­i­cal user shift, the per­tur­ba­tions could pose some prob­lems for the most sen­si­tive ex­per­i­ments. One third of the BPMs were re­placed in Oc­to­ber 2008 and the re­main­ing in Oc­to­ber 2009. Thus, this large vac­u­um in­ter­ven­tion aimed at im­prov­ing the ther­mal and me­chan­i­cal sta­bil­i­ty of the elec­tron beam orbit mea­sure­ment sys­tem. Fi­nal­ly, it will be pre­sent­ed the main changes made in the vac­u­um cham­bers and a sur­vey of the evo­lu­tion of the vac­u­um sys­tem after both in­ter­ven­tions.