J. Feikes; Status of MLS

European Synchrotron Light Source XVI.

Commissioning of the Metrology Light Source

in Berlin AdlershofJ. 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 undulator 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

be

am

cu

rre

nt

/ m

A

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 loss@630 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