J. Feikes; Status of MLS European Synchrotron Light Source XVI. Commissioning of the Metrology Light Source in Berlin Adlershof J. Feikes for the BESSY&PTB-Commissioning Team MLS = Light Source owned by the PTB (??) optimized as a VUV to THz Source built and operated by former BESSY now HZB A dedicated design to include THz generation (Godes Talk)

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Metrology Light Source Some MLS parameters 48m circumference Double bend achromat lattice 200MeV - 600MeV operating energy 1 electron up to 200mA current 105 MeV injection Microtron

J. Feikes; Status of MLS European Synchrotron Light Source XVI. July 13, 2007 first accumulated beam 1mA Aug 14, 2007 first beam ramped to 630 MeV Aug 25, 2007 accumulation up to 10 mA by slow injection (every 6 s ) Sep/Oct 2007 current limit around 12 mA --> Ions April 1, 2008 start of user operation May 5, 2008 design current of 200 mA reached Nov 14, 2008 u ndulator U180 succesfully commissioned MLS Commissioning Milestones

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Accumulation up to 10 mA by slow injection (6 s ) current beam current / mA current loss per shot

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Injection problems caused by ions current increment cause poor lifetime at I >few mA reason: beam blow up due to ions. Beam fills aperture completely solutions: ion clearing (-300V at 8 BPMs at ends of straights) beam shaking at transversal Tune beam scrubbing -> next slides

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Cycling with minor beam loss 1.faster current refill 2.radiation protection - no beam MeV 3.simplifies automated scrubbing

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Automated beam scrubbing tool: Operation Master automated operator (state machine)

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Operation Master –flow chart

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Beam Scrubbing – Operation Master (detail) highly complex minimizing operator errors develops iteratively by practical use good experience with automated operation correct ramp tables loaded ?

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Automated Beam Scrubbing at MLS

J. Feikes; Status of MLS European Synchrotron Light Source XVI. Beam Scrubbing – efficiency still improving

J. Feikes; Status of MLS European Synchrotron Light Source XVI. MLS – typical user operation conditions typical initial currents of 120 – 140 mA at 8 hrs LT typical Run time 6 hrs Injection cycle: Ramp-Down-Refill-Ramp-Up ~ 15 min