Author: Balzer, A.F.
Paper Title Page
THHA3O02 Status of the Continuous Mode Scan for Undulator Beamlines at BESSY II 1091
 
  • A.F. Balzer, E. Schierle, E. Suljoti, M. Witt
    HZB, Berlin, Germany
  • R. Follath
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  At the syn­chro­tron light source BESSY II mono­chro­ma­tor (MONO) and in­ser­tion de­vice (ID) scans can be done syn­chro­nized in two dif­fer­ent modes. In step mode MONO and ID move in­de­pen­dently to in­ter­me­di­ate tar­get po­si­tions of an en­ergy scan. In con­tin­u­ous mode (CM) MONO and ID cover the whole range of the scan non­stop in a cou­pled mo­tion. Data ac­qui­si­tion is done con­tin­u­ously at the speed pro­vided by the CM scan and is avail­able in reg­u­lar user op­er­a­tion. Cur­rently CM is in op­er­a­tion at 11 un­du­la­tor beam­lines at BESSY II. 3 new beam­lines re­quest­ing CM are under con­struc­tion. Dur­ing CM the MONO EPICS IOC acts as a con­troller forc­ing the MONO op­tics to fol­low the move­ment of the ID. A non-lin­ear pre­dic­tive con­trol scheme is used to im­ple­ment this dy­namic cou­pling. The con­troller task uti­lizes poly­no­mial re­gres­sion to ex­trap­o­late the ID mo­tion. Cal­cu­la­tion of the tra­jec­to­ries for MONO grat­ing and mir­ror is based on bi­jec­tive gap to en­ergy lookup ta­bles and the grat­ing equa­tion. In this paper the tech­ni­cal im­ple­men­ta­tion, lim­i­ta­tions, re­cently de­vel­oped di­ag­nos­tic meth­ods, and fu­ture plans for im­prove­ments are pre­sented.  
slides icon Slides THHA3O02 [0.903 MB]  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)